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1.
Tanasienko IV Emets AI Pirko IaV Korkhovoĭ VI Abumkhadi N Blium IaB 《T?Sitologii?a i genetika》2011,45(1):3-10
Method of biolistic transformation was used for genetic improvement of commercial barley cultivars (Oksamitoviy, Vodogray and Getman). The plasmid pHLFTuBA was used for particle bombardment that consists of the hLF gene under the control of the barley glutelin B-1 promoter and a selectable marker gene, alpha-tubulin conferring resistance to trifluralin (dinitroanilinr herbicide). Preliminary screening of different trifluralin concentration range from 0,1 to 30 microM was tested for determination of effective selective agent concentration. Two transgenic barley line of genotype Oksamitiviy and transgenic callus line of cultivar Getman were obtained after selection on 10 microM of trifluralin. To confirm the transgenic nature of regenerated plants, the PCR analysis was carried out. The 734bp length fragment of hLFgene was amplified from both regenerated plants. 相似文献
2.
Effects of growth regulators and incubation period on in vitro regeneration of adventitious shoots from gerbera petioles 总被引:4,自引:0,他引:4
Orlikowska Teresa Nowak Elzbieta Marasek Agnieszka Kucharska Danuta 《Plant Cell, Tissue and Organ Culture》1999,59(2):95-102
An effective system for in vitro regeneration of adventitious shoots from callus for the transformation or mutation of gerbera was developed. Callus was produced
from petioles of the youngest 3–4 leaves detached from auxillary shoots produced in vitro. Induction medium, on which leaves were incubated over 3 or 6 days, contained 2.3 μM thidiazuron and 0.53 μM α-naphthaleneacetic
acid. Explants were than transferred to one of three regeneration media with lower levels of growth regulators. Regeneration
was quantified over four (4-weeks each) passages at the time of explant transfer to fresh medium. Direct shoot regeneration
occurred during the first 4 weeks, and after these shoots were discarded a semi-compact organogenic callus was produced. Effectiveness
of shoot regeneration depended on four criteria: the cultivar (three cultivars were tested), the sequence of passage on regeneration
medium, the growth regulators in regeneration medium and the duration of the induction period. Regeneration potential from
calli of all cultivars increased from the first to the fourth passage. Duration of the incubation period on induction medium
(3 or 6 days) influenced regeneration to varying degrees, depending on the cultivar used and the regeneration medium contents.
There were no differences between two of the regeneration media – B, containing 2.2 μM 6-benzyladenine and 0.3 μM indole-3-acetic
acid and C, containing 4.4 μM 6-benzyladenine, 4.6 μM zeatin and 0.6 μM indole-3-acetic acid. Cultivar Mariola was the most
productive and regenerated more than seven shoots per callus in the fourth passage. Regeneration on medium B was further evaluated
on four additional gerbera cultivars.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
3.
Mature zygotic embryos of recalcitrant Christmas tree species eastern white pine (Pinus strobus L.) were used as explants for Agrobacterium tumefaciens strain GV3101-mediated transformation using the uidA (β-Glucuronidase) gene as a reporter. Influence of the time of sonication and the concentrations of protein phosphatase inhibitor
(okadaic acid) and kinase inhibitor (trifluoperazine) on Agrobacterium-mediated transformation have been evaluated. A high transformation frequency was obtained after embryos were sonicated for
45–50 s, or treated with 1.5–2.0 μM okadaic acid or treated with 100–200 μM trifluoperazine, respectively. Protein phosphatase
and kinase inhibitors enhance Agrobacterium-mediated transformation in eastern white pine. A 2–3.5-fold higher rate of hygromycin-resistant callus was obtained with
an addition of 2 μM okadaic acid or 150 μM trifluoperazine or sonicated embryos for 45 s. Stable integration of the uidA gene in the plant genome of eastern white pine was confirmed by polymerase chain reaction (PCR), Southern and northern blot
analyses. These results demonstrated that a stable and enhanced transformation system has been established in eastern white
pine and this system would provide an opportunity to transfer economically important genes into this Christmas tree species.
Communicated by W. H. Wu 相似文献
4.
Vijendra K. Sharma Robert Hänsch Ralf R. Mendel Jutta Schulze 《Plant Cell, Tissue and Organ Culture》2007,88(1):21-33
A successful regeneration system is presented for elite cultivars in barley and wheat based on nodes. Nodal explants were
excised from in vitro and ex vitro grown plants. A combination of 8.28 μM 4-amino-3,5,6-trichloropicolinic acid and 4.54 μM
to 22.71 μm thidiazuron (TDZ) used in MS-based medium containing 60 g l−1 maltose favoured induction of clumps of multiple shoots/buds with or without callus formation in the primary cultures. Within
8–10 weeks upon further subcultures, the proliferation into callus with rapid and continuously forming adventitious buds containing
clusters of meristemoids, termed meristematic bulk tissue (MBT) was obtained. Lowering the levels of growth regulators resulted
in redifferentiation of shoots, which elongated, rooted, developed into morphologically normal plants and set seeds normally.
With a frequency ranging between 37 and 82% the nodes raised from in vitro grown plants were proliferated into MBT independent
of TDZ concentration, cultivar and species. The average number of shoots per responding node in different cultivars was 7–15
in barley and 1–6 in wheat after 12–14 weeks. Nodes from greenhouse grown plants mainly responded for callus formation with
poor development of MBT. 相似文献
5.
In vitro regeneration of cereals based on multiple shoot induction from mature embryos in response to thidiazuron 总被引:1,自引:0,他引:1
Seedhabadee Ganeshan Sanjay V. Chodaparambil Monica B?ga D. Brian Fowler Pierre Hucl Brian G. Rossnagel Ravindra N. Chibbar 《Plant Cell, Tissue and Organ Culture》2006,85(1):63-73
The in vitro competency of mature cereal embryos (winter, spring and durum wheats, oat, barley and triticale) was assessed for direct
multiple shoot production on culture media containing the plant growth regulators, thidiazuron (TDZ) and/or 6–benzylaminopurine
(BAP). Mature embryos of CDC Dancer oat showed the best response, with 69 shoots per explant on culture medium containing
a combination of 4.5 μM TDZ and 4.4 μM BAP. TDZ alone induced about 16 shoots per explant from the oat. Among the wheat genotypes,
durum wheat showed the most number of shoots (35) per explant on culture medium containing 4.5 μM of TDZ and 4.4 μM of BAP.
With TDZ alone, shoot regeneration for durum wheat ranged from 27–32 shoots per explant. The regeneration frequency from the
three winter wheat genotypes ranged from 11–25 shoots per explant and was highest on culture medium containing 9.1 μM TDZ
and 4.4 μM BAP. The latter culture medium was also effective for a triticale genotype, inducing 34 shoots per explant. The
regeneration from mature embryos of barley genotypes ranged from 5–9 shoots per explant. The mature embryos of all the cereals
tested could be used for in vitro regeneration with TDZ and TDZ+BAP combinations. 相似文献
6.
Xiuping Zou Demou Li Xiaoying Luo Keming Luo Yan Pei 《In vitro cellular & developmental biology. Plant》2008,44(3):169-177
Highly efficient Agrobacterium-mediated transformation of trifoliate orange (Poncirus trifoliata (L.) Raf.) was achieved via indirect shoot organogenesis. Stable transformants were obtained from epicotyl segments infected
with Agrobacterium strain EHA 105 harboring the binary vector pBI121, which contained the neomycin phosphotransferase gene (NPTII) as a selectable
marker and the β-glucuronidase (GUS) gene as a reporter. The effects of regeneration and selection conditions on the transformation
efficiency of P. trifoliata (L.) Raf. have been investigated. A 7-d cocultivation on a medium with 8.86 μM 6-benzylaminopurine (BA)+1.43 μM indole-3-acetic
acid (IAA) was used to improve callus formation from epicotyl segments after transformation. A two-step selection strategy
was developed to select kanamycin-resistant calluses and to improve rooting of transgenic shoots. Transgenic shoots were multiplied
on shoot induction medium with 1.11 μM BA + 5.71 μM IAA. Using the optimized transformation procedure, transformation efficiency
and rooting frequency reached 417% and 96%, respectively. Furthermore, the number of regenerated escape shoots was dramatically
reduced. Stable integration of the transgenes into the genome of transgenic citrus plants was confirmed by GUS histochemical
assay, PCR, and Southern blot analysis. 相似文献
7.
Rangan Parimalan Akshatha Venugopalan Parvatam Giridhar G. A. Ravishankar 《Plant Cell, Tissue and Organ Culture》2011,105(3):317-328
Establishment, maintenance, regeneration, and transformation of somatic embryos by both direct and indirect means (callus-mediated)
was achieved for Bixa orellana, a tropical plant whose seeds produce commercially edible ‘annatto pigment,’ which mainly constitutes an apocarotenoid called
bixin. Callus-mediated methodology was found to be efficient in producing a greater number of embryos in a short time. The
maximum of 28 somatic embryos were produced in 16–18 weeks when immature zygotic embryonic stalks were inoculated onto Murashige
and Skoog (MS) medium containing B5 vitamins supplemented with 0.44 μM benzyladenine (BA), 0.054 μM α-naphthaleneacetic acid
(NAA), 2.89 μM gibberellic acid (GA3), 0.02 μM triiodobenzoic acid (TIBA), and 0.011 μM triacontanol (TRIA). Callus initiation from hypocotyl explants was obtained
on MS medium supplemented with 1.07–2.14 μM NAA and 10.2 μM BA. In 3 months, somatic embryos were produced when callus was
inoculated onto MS medium supplemented with 4.44 μM BA, 40 μM AgNO3, and 0.011 μM TRIA. Somatic embryos were efficiently regenerated on MS basal solid and liquid media supplemented with 0.44–4.4 μM
BA, 0.54–2.69 μM NAA, 4.92 μM 2iP, 2.1 μM calcium d-pantothenate, 0.21 μM biotin, 227.7 μM cysteine HCl monohydrate, and 108.6 μM adenine sulfate. Agrobacterium tumefaciens GV 3101 harboring pCAMBIA 1305.2 binary vector-mediated stable transformation of somatic embryos exhibited a transformation
frequency of 2.56%. As somatic embryogenesis in any perennial system is useful in terms of both commercial and scientific
nature, this somatic embryo-based transformation protocol for the commercially important dye-yielding tropical plant B. orellana is useful for its improvement through genetic engineering. 相似文献
8.
A method for the genetic transformation of several citrus cultivars is described, including cultivars observed to be recalcitrant
to conventional epicotyl-mediated transformation. Embryogenic cell suspension cultures, established from unfertilized ovules
were used as target tissues for Agrobacterium-mediated transformation. Several modifications were made to the culture environment to investigate factors required for efficient
transfer of the T-DNA and the subsequent regeneration of transgenic citrus plants. It was determined that co-cultivation of
citrus cells and Agrobacterium in EME medium supplemented with maltose (EME-M) and 100 μM acetosyringone for 5 days at 25°C was optimum for transformation
of each of the citrus cultivars. Efficient selection was obtained and escapes were prevented when the antibiotic hygromycin
B was used as a selection antibiotic following transformation with an Agrobacterium strain containing hptII in the T-DNA region. Transgenic embryo regeneration and development was enhanced in medium that contained a liquid overlay
consisting of a 1:2 mixture of 0.6 M BH3 and 0.15 M EME-M media. PCR and Southern blot analyses confirmed the presence of
the T-DNA and the stable integration into the genome of regenerated plants, while RT-PCR demonstrated variable amounts of
RNA being transcribed in different transgenic lines. This protocol can create an avenue for insertion of useful traits into
any polyembryonic citrus cultivar that can be established as embryogenic cell suspension cultures, including popular specialty
mandarins and seedless cultivars. 相似文献
9.
A simple and rapid method for multiple shoot formation in vitro from immature embryo axis explants of Carica papaya L. cvs. Honey Dew, Washington and Co2 is described. Multiple shoot regeneration was achieved by culture of the explants on
modified Murashige and Skoog (MS) medium supplemented either with thidiazuron (TDZ; 0.45–22.7 μM) or a combination of benzylaminopurine
(BAP; 0.2 – 8.84 μM) and naphthalene acetic acid (NAA; 0.5 – 2.64 μM). Highest frequency of shoot regeneration occurred on
medium supplemented either with 2.25 μM TDZ or a combination of BAP (4.4 μM) and NAA (0.5 μM). Composition of the basal media
influenced the frequency of multiple shoot initiation. Stunted shoots regenerated at 4.5 μM and higher concentrations of TDZ.
Such shoots could, however, be elongated by transfer to medium containing 5.7 μM GA3. Rooting of the regenerated shoots was achieved in presence of indolebutyric acid (IBA; 4.92 – 19.68 μM), however, least
response was in presence of 14.7 μM IBA. Rooted plants were hardened and transferred to pots.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
10.
Characteristics of amino acid uptake in barley 总被引:2,自引:0,他引:2
Plants have the ability to take up organic nitrogen (N) but this has not been thoroughly studied in agricultural plants. A
critical question is whether agricultural plants can acquire amino acids in a soil ecosystem. The aim of this study was to
characterize amino acid uptake capacity in barley (Hordeum vulgare L.) from a mixture of amino acids at concentrations relevant to field conditions. Amino acids in soil solution under barley
were collected in microlysimeters. The recorded amino acid composition, 0–8.2 μM of l-Serine, l-Glutamic acid, Glycine, l-Arginine and l-Alanine, was then used as a template for uptake studies in hydroponically grown barley plants. Amino acid uptake during 2 h
was studied at initial concentrations of 2–25 μM amino acids and recorded as amino acid disappearance from the incubation
solution, analysed with HPLC. The uptake was verified in control experiments using several other techniques. Uptake of all
five amino acids occurred at 2 μM and below. The concentration dependency of the uptake rate could be described by Michaelis–Menten
kinetics. The affinity constant (K
m) was in the range 19.6–33.2 μM. These K
m values are comparable to reported values for soil micro-organisms. 相似文献
11.
Ultrasonic treatment stimulates multiple shoot regeneration and explant enlargement in recalcitrant squash cotyledon explants in vitro 总被引:1,自引:0,他引:1
Ananthakrishnan G Xia X Amutha S Singer S Muruganantham M Yablonsky S Fischer E Gaba V 《Plant cell reports》2007,26(3):267-276
Ultrasonic treatment (0.5–2 min) stimulated multiple shoot regeneration to high levels in vitro from recalcitrant cotyledon
explants of commercial squash (Cucurbita pepo L.) cultivars Ma’yan and Bareqet, on Murashige and Skoog [Physiol Plant 15:473–497, 1962] (regeneration) medium augmented
with 4.4 μM benzyladenine. At this stage, unsonicated control explants regenerated only a few very small shoots or bud-like
structures. Ultrasound also stimulated massive explant growth. Ultrasound treatment resulted in further multiple shoot production
(five times greater than control) after explant transfer to elongation medium (Murashige and Skoog [Physiol Plant 15:473–497,
1962] medium with 0.44 μM benzyladenine and 2.9 μM gibberellic acid). Longer ultrasonic treatments (5 or 10 min) promoted
multiple shoot regeneration and explant growth accompanied by hyperhydration. Scanning electron microscope observations showed
that 2 min ultrasound changed the joint area between epidermal cells and removed some of the surface from the cotyledon epidermal
cells, without gross surface injury to the explants. Longer periods of ultrasound (5–10 min) caused further surface erosion.
Rubbing the explant contact surface with chloroform or sandpaper emulated the effect of sonication on shoot regeneration and
explant growth, demonstrating that ultrasound exerts its morphogenic influence by surface removal. Sonication of explants
from other batches of squash seeds (of cultivars Ma'yan and True French), that regenerated without such treatment, reduced
regeneration and caused hyperhydration. This is the first report of stimulation of in vitro regeneration by ultrasound treatment.
Electronic Supplementary Material Supplementary material is available in the online version of this article at and is accessible for authorized users. 相似文献
12.
Vengadesan G Amutha S Muruganantham M Anand RP Ganapathi A 《Plant cell reports》2006,25(11):1174-1180
Transgenic herbicide tolerant Acacia sinuata plants were produced by transformation with the bar gene conferring phosphinothricin resistance. Precultured hypocotyl explants were infected with Agrobacterium tumefaciens strain EHA105 in the presence of 100 μM acetosyringone and shoots regenerated on MS (Murashige and Skoog, 1962, Physiol Plant 15:473–497) medium with 13.3 μM benzylaminopurine, 2.6 μM indole-3-acetic acid, 1 g l−1 activated charcoal, 1.5 mg l−1 phosphinothricin, and 300 mg l−1 cefotaxime. Phosphinothricin at 1.5 mg l−1 was used for the selection. Shoots surviving selection on medium with phosphinothricin expressed GUS. Following Southern hybridization, eight independent shoots regenerated of 500 cocultivated explants were demonstrated to be transgenic, which represented transformation frequency of 1.6%. The transgenics carried one to four copies of the transgene. Transgenic shoots were propagated as microcuttings in MS medium with 6.6 μM 6-benzylaminopurine and 1.5 mg l−1 phosphinothricin. Shoots elongated and rooted in MS medium with gibberellic acid and indole-3-butyric acid, respectively both supplemented with 1.5 mg l−1 phosphinothricin. Micropropagation of transgenic plants by microcuttings proved to be a simple means to bulk up the material. Several transgenic plants were found to be resistant to leaf painting with the herbicide Basta. 相似文献
13.
Begoña Echavarri Mercedes Soriano Luis Cistué M. Pilar Vallés Ana M. Castillo 《Plant Cell, Tissue and Organ Culture》2008,93(3):295-301
The effect of ZnSO4 concentration on barley (Hordeum vulgare L.) microspore embryogenesis was investigated using cultivars of different androgenetic response. Concentrations from 0 (control)
to 600 μM in the stress pre-treatment medium alone or in combination with 30 (control) to 600 μM in the embryo induction medium
were assayed in anther culture. Incorporation of Zn2+ in the pre-treatment medium itself did not affect microspore embryogenesis. The optimum concentration in the stress pre-treatment
and induction media was 180 μM for cultivars (cvs.) Igri and Reinette, and 90 μM for cv. Hop. A significant increase of 30
and 300% in cv. Igri and Reinette, respectively, were produced with 180 μM ZnSO4 in both the number of embryos and green plants. In order to confirm the effect of Zn2+ on microspore embryogenesis this micronutrient was incorporated in the induction medium of isolated microspore cultures of
cv. Igri. Concentrations of 90–300 μM ZnSO4 resulted in an increase of 40–53% in the number of embryos and green plants. All these results indicate that the beneficial
effect of Zn2+ is exerted mainly during the culture phase, increasing the number of embryos, leading to an increased number of green plants,
but it had no effect on percentage of regeneration or green plants. 相似文献
14.
The dwarf pomegranate (Punica granatum L. var. nana) is a dwarf ornamental plant that has the potential to be the model plant of perennial fruit trees because it bears fruits
within 1 year of seedling. We established an Agrobacterium-mediated transformation system for the dwarf pomegranate. Adventitious shoots regenerated from leaf segments were inoculated
with A. tumefaciens strain EHA105 harboring the binary vector pBin19-sgfp, which contains neomycin phosphotransferase (npt II) and green fluorescent protein (gfp) gene as a selectable and visual marker, respectively. After co-cultivation, the inoculated adventitious shoots were cut
into small pieces to induce regeneration, and then selected on MS medium supplemented with 0.5 μM α-naphthaleneacetic acid
(NAA), 5 μM N6-benzyladenine (BA), 0.3% gellan gum, 50 mg/l kanamycin, and 10 mg/l meropenem. Putative transformed shoots were regenerated
after 6–8 months of selection. PCR and PCR-Southern blot analysis revealed the integration of the transgene into the plant
genome. Transformants bloomed and bore fruits within 3 months of being potted, and the inheritance of the transgene was confirmed
in T1 generations. The advantage of the transformation of dwarf pomegranate was shown to be the high transformation rate. The establishment
of this transformation system is invaluable for investigating fruit-tree-specific phenomena. 相似文献
15.
Rodrigues-Otubo B.M. de O. Penteado M.I. do Valle C.B. 《Plant Cell, Tissue and Organ Culture》2000,61(3):175-182
Age of explant and six different media were evaluated with the objective of regenerating higher numbers of interspecific hybrids
between sexual and apomictic Brachiaria. Immature embryos of 7–8, 9–10 and 11–12 days after pollination (DAP), from artificial hybridization between Brachiaria ruziziensis (R) as female parent, and B. brizantha (B) or B. decumbens (D) as male parent, were cultured in modified MS media (M4) – supplemented with different combinations of growth regulators
and vitamins. Embryos cultured 9–12 DAP showed high percentage (85–100%) of germination for all the crosses examined. Germination
and survival rates varied according to accessions within crosses. Six different media (all modified MS with different growth
regulators and vitamins) were tested with the objective of inducing multiple shoots from 7 to 10 DAP embryos, from crosses
between R × B. The media M1, supplemented with Kinetin (13.94 μM) and NAA (5.37 μM), and media M3, supplemented with BA (4.44
μM and IAA 2.85 μM), regenerated adventitious shoots and calli about 30–40 days after inoculation. The highest multiplication
rate observed was 2.85 shoots per explant in media M1, 60–70 days after culturing. Two other media, M6, supplemented with
2,4-D (13.57 μM) and M2, with 2,4-D (9.05 μM) and BA (8.87 μM) exclusively induced the formation of calli. The described protocols
proved to be efficient in regenerating healthy seedlings from immature embryos of interspecific hybrids in Brachiaria.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
16.
E. A. Popowich A. P. Firsov T. Y. Mitiouchkina V. L. Filipenya S. V. Dolgov V. N. Reshetnikov 《Plant Cell, Tissue and Organ Culture》2007,90(3):237-244
Transgenic plants of hyacinth (Hyacinthus orientalis L.) cvs. Edisson and Chine Pink have been obtained by Agrobacterium-mediated transformation. Leaf explants of the both hyacinth cultivars regenerated shoots on MS medium containing 2.2 μM BAP
and 0.3 μM NAA at a frequency of 95%. A. tumefaciens strain CBE21 carrying binary vector pBIThau35 was used for transformation. Plasmid pBIThau35 has been produced by cloning
preprothaumatin II cDNA into pBI121 instead of uidA gene. Inoculated leaf explants formed calli and shoots at high frequency on selective medium with 100 mg l−1 kanamycin. Four hyacinth transgenic lines of cv. Chine Pink and one line of cv. Edisson have been selected on medium containing 200 mg l−1 kanamycin. The insertion of thaumatin II gene into hyacinth genome has been confirmed by PCR-analysis. All transgenic plants
expressed substantial amounts of thaumatin II (between 0.06 and 0.28% of the total soluble protein). Hyacinth transgenic lines
were assayed for resistance to the pathogenic fungi Fusarium culmorum and Botrytis cinerea. There were no significant differences between nontransformed control and transgenic leaves of both cultivars. At the same
time the bulbs of the transgenic line Н7401 cv. Chine Pink showed the higher level of resistance to B. cinerea, the bulbs of the transgenic line Н7404 were more resistant to F. culmorum. In both cases the signs of the fungal disease were developed more slowly. The resistance of the bulbs cv. Edisson line to these fungi was not changed. All transgenic hyacinth plant were successfully transferred to soil for further evaluation. 相似文献
17.
Qin-Mei Wang Feng-Zhan Gao Xiang Gao Fan-Yu Zou Xin Sui Meng Wang Yue-Jun Hui Li Wang 《Plant Cell, Tissue and Organ Culture》2012,109(2):191-200
An efficient in vitro micropropagation system for Clivia miniata Regel was developed using basal tissues of young petals and young ovaries as explants. For callus induction, explants were
incubated on Murashige and Skoog (MS) medium containing either 2.22 μM 6-benzyladenine (BA) and 4.52 μM 2,4-dichlorophenoxyacetic
acid (2,4-D) or 4.44 μM BA, 5.37 μM α-naphthaleneacetic acid (NAA), and 9.05 μM 2,4-D. Moreover, callus was induced from young
ovaries when these were incubated on MS medium containing 8.88 μM BA, 10.74 μM NAA, and 9.05 or 18.10 μM 2,4-D. Subsequently,
callus was transferred to MS medium supplemented with kinetin (KT) and NAA for shoot organogenesis. Frequency of shoot regeneration
from petal-derived callus was highest when callus was transferred to medium containing 2.69 μM NAA with either 9.29 or 13.94 μM
KT. Shoot regeneration frequency from ovary-derived callus was highest when this callus was transferred to medium containing
9.29 μM KT and 10.74 μM NAA. Overall, different explant types exhibited different organogenic capacities wherein, young petals
had higher shoot regeneration frequencies than young ovaries. The highest rooting frequency (98.25 ± 3.04%) was obtained when
shoots were transferred to half-strength MS medium without plant growth regulators. Regenerated plantlets were transplanted
to soil mix and acclimatized, yielding a 96.80% survival frequency. Only 0.6% of regenerated plantlets exhibited morphological
changes. The diploid status (2n = 22) of regenerated plantlets was determined using chromosome counts of root-tips. Moreover, inter-simple sequence repeats
were used to assess the genetic fidelity of regenerated plantlets. Overall, regenerated plants shared 90.5–100.0% genetic
similarities with mother plants and 89.0–100.0% similarities with each other. 相似文献
18.
A protocol was developed for rapid and efficient production of transgenic celery plants via somatic embryo regeneration from
Agrobacterium tumefaciens- inoculated leaf sections, cotyledons and hypocotyls. These explants were excised from in vitro seedlings of the cvs. XP166
and XP85 and inoculated with A. tumefaciens strain EHA105 containing the binary vector pBISN1. PBISN1 has the neomycin phosphotransferase gene (nptII) and an intron interrupted β-glucuronidase (GUS) reporter gene (gusA). Co-cultivation was carried out for 4 d in the dark on callus induction medium (CIM): Gamborg B5 + 2.79 μM kinetin + 2.26 μM
2,4-dichlorophenoxyacetic acid (2,4-D) supplemented with 100 μM acetosyringone. Embryogenic calluses resistant to kanamycin
(Km) were then recovered on CIM + 25 mg l−1 Km + 250 mg l−1 timentin after 12 weeks. Subsequently, a large number of Km-resistant and GUS-positive transformants, tens to hundreds per
explant were regenerated via somatic embryogenesis on Gamborg B5 + 4.92 μM 6 (γ,γ-dimethylallylamino)-purine (2iP) + 1.93 μM
α-naphthaleneacetic acid (NAA) + 25 mg l−1 Km + 250 mg l−1 timentin after 8 weeks. Using this protocol, the transformation frequency was 5.0% and 5.0% for leaf sections, 17.8% and
18.3% for cotyledons, and 15.9% and 16.7% for hypocotyl explants of cvs. XP85 and XP166, respectively. Stable integration
of the model transgenes with 1–3 copy numbers was confirmed in all ten randomly selected transgenic events by Southern blot
analysis of gusA. Progeny analysis by histochemical GUS assay showed stable Mendelian inheritance of the transgenes. Thus, A. tumefaciens-mediated transformation of cotyledons or hypocotyls provides an effective and reproducible protocol for large-scale production
of transgenic celery plants. 相似文献
19.
M. Arshad J. Silvestre G. Merlina C. Dumat E. Pinelli J. Kallerhoff 《Plant Cell, Tissue and Organ Culture》2012,108(2):315-322
Shoot organogenesis from mature leaf tissues of two scented Pelargonium capitatum cultivars, ‘Attar of Roses’ and ‘Atomic Snowflake’, grown in the greenhouse, were optimized in the presence of thidiazuron
(TDZ). The protocol involved preculture of leaf sections on basal Murashige and Skoog (MS) medium supplemented with 10 μM
TDZ, 4.4 μM of 6-benzyladenine (BA) and 5.4 μM α-naphtaleneacetic acid (NAA) for a period of 2 weeks and followed by subculture
of explants to a fresh medium containing 4.4 μM BA and 5.4 μM NAA. Frequency of regeneration reached approximately 93% for
both cultivars, with the induction of more than 100 shoots per explant. Regenerated plantlets were rooted on half-strength
MS medium supplemented with 4.4 mM sucrose and 8.6 μM of Indole-3-acetic acid (IAA). All regenerated shoots from both cultivars
developed roots when transferred to organic soil mix, acclimatized, and successfully transferred to greenhouse conditions.
When regenerated shoots were transferred to hydroponic conditions, frequency of survival was 76.2 and 61.9% for ‘Attar of
Roses’ and ‘Atomic Snowflake’, respectively. 相似文献
20.
Plants of C. ovata were regenerated in vitro from shoot tips and nodal explants as well as from cotyledon-derived calluses. For shoot proliferation from shoot tips and
nodal segments, Schenk and Hildebrandt (1972) or Lloyd and McCown (1980) basal media, supplemented with 6-benzyladenine (2.2–22.2
μM) alone or in combination with indole-3-acetic acid (0.6 μM), were used. Shoot regeneration through organogenesis was achieved
by culturing cotyledons on Schenk and Hildebrandt medium containing indole-3-acetic acid (0.6 μM) and 6-benzyladenine (4.4
μM) or zeatin (22.8 μM). TLC and HPLC analysis showed that the multiple shoots and micropropagated plants exhibited similar
iridoid patterns as those of the leaves of original plants of C. ovata. The highest levels of catalpol and catalposide (8.2 and 2.4 % of dry weight, respectively) were found in aerial parts of
three-month-old in vitro regenerated plants.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献