共查询到20条相似文献,搜索用时 399 毫秒
1.
Filipendula ulmaria (L.) Maxim (meadowsweet) is a medicinal plant that is claimed to have several biological activities, including anti-tumor,
anti-carcinogenic, anti-oxidant, anti-coagulant, anti-ulcerogenic, anti-microbial, anti-arthritic, and immunomodulatory properties.
This report describes, for the first time, an efficient plant regeneration system for F. ulmaria via adventitious shoot development from leaf, petiole, and root explants cultured on Murashige and Skoog’s minimal organics
medium containing different concentrations of thidiazuron (TDZ), benzyladenine, and kinetin either alone or in combination
with different auxins. Relatively extensive/prolific shoot regeneration was observed in all three explant types with TDZ in
combination with indole-3-acetic acid (IAA). Gibberellic acid (GA3), TDZ, and IAA combinations were also tested. The best shoot proliferation was observed among root explants cultured on media
supplemented with 0.45 μM TDZ + 2.85 μM IAA + 1.44 μM GA3. Regenerated shoots were transferred to rooting media containing different concentrations of either IAA, indole-3-butyric
acid (IBA), naphthalene acetic acid, or 2,4-dichlorophenoxyacetic acid. Most shoots developed roots on medium with 2.46 μM
IBA. Rooted explants were transferred to vermiculite in Magenta containers for a 2-wk acclimatization period and then finally
to plastic pots containing potting soil. The plantlets in soil were kept in growth chambers for 2 wk before transferring to
greenhouse conditions. 相似文献
2.
An efficient protocol was developed for micropropagation of an economically important timber-yielding multipurpose tree, Pterocarpus marsupium Roxb. Multiple shoots were induced from cotyledonary nodes (CNs) derived from 18-d-old axenic seedlings on Murashige and
Skoog (MS) medium supplemented with thidiazuron (TDZ) (0.1–10 μM). The highest shoot regeneration frequency (90%) and maximum
number (15.2 ± 0.20) of shoots per explant was recorded on MS medium amended with 0.4 μM TDZ. Continuous presence of TDZ inhibited
shoot elongation. In the primary medium, TDZ-initiated cultures were transferred to the secondary medium supplemented with
another cytokinin, 6-benzyladenine (BA), for shoot growth and elongation. Maximum (90%) shoot elongation with an average shoot
length of 5.4 ± 0.06 cm was observed at 5 μM BA. To further enhance the number of shoots per explant, mother tissue was repeatedly
subcultured on fresh shoot induction medium after each harvest of newly formed shoots. Thus, by adopting this strategy, an
average of 44 shoots per explant could be obtained. About 65% of in vitro regenerated shoots produced a maximum number (4.4 ± 0.2) of roots per shoot by a two-step culture procedure employing pulse
treatment and subsequent transfer of treated shoots to a low concentration of 0.2 μM indole-3-butyric acid along with phloroglucinol
(3.96 μM). The in vitro-raised plantlets were successfully acclimatized first under culture room conditions, then to greenhouse with 70% survival
rate. 相似文献
3.
Summary Tennessee coneflower [Echinacea tennesseensis (Beadle) Small] was regenerated from flower stalks, leaf sections from flowering plants, and hypocotyls and cotyledons from
seedlings. Murashige and Skoog medium (MS) supplemented with naphthaleneacetic acid (NAA) at 0.54 μM and thidiazuron (TDZ) at 22.7 μM yielded the most shoots per leaf explant. NAA and 6-benzylaminopurine concentrations for optimal shoot regeneration from
leaf, flower stalk, cotyledon and hypocotyl explants in MS media were 0.54 and 24.6μM, respectively. All explant types generated shoots; however, those derived from leaves and flower stalks produced the highest
number of shoots per explant and highest percentage of explants with shoots. Explants cultured on media containing high levels
of NAA (5.4–27 μM) formed calluses but no adventitious shoot. Leaf explants responded to a wider range of NAA concentrations than the other
explant types but shoots generated from flower stalks grew the fastest. While all cytokinins tested increased the number of
shoots per explant, the number of shoots in media containing TDZ was increased by nearly threefold. Regenerated shoots from
all explant types cultured on MS medium supplemented with 0.25 μM indole-3-butyric acid initiated roots within 4 wk; NAA was not effective for root induction. All vernalized plantlets developed
into plants that were morphologically identical to the source material. 相似文献
4.
Seabuckthorn (Hippophae rhamnoides) is a multipurpose small tree with unique berries of high nutritional and pharmaceutical values. A clonally propagated plant
originating from a 20-year-old tree of H. r. rhamnoides × mongolica hybrid cultivar Julia and seedling offspring of this cultivar were investigated regarding induction of shoot organogenesis
in leaf explants and in roots of intact seedlings, and induction of direct somatic embryogenesis in explants from shoot tissue.
The highest percentage of leaf explants showing shoot organogenesis was achieved (juvenile explants, 65%; adult explants,
75%) when incubated in Murashige and Skoog (MS) medium supplemented with either 4.5 μM of the phenylurea cytokinin thidiazuron
(TDZ) or 2.25 μM TDZ plus 2.2 μM 6-benzyladenine (BA), for juvenile and adult explants, respectively, both supplemented with
0.53 μM α-naphthaleneacetic acid (NAA). Juvenile explants developed on average 18 shoots per explant in the MS medium supplemented
with 4.5 μM TDZ, a four fold increase over those incubated on the medium supplemented with 2.25 μM TDZ and 2.2 μM BA. Adult
leaf explants grown on medium containing 2.25 μM TDZ and 2.2 μM BA medium produced 12 shoots per explant, while those grown
on medium containing 4.5 μM TDZ produced 5 shoots per explant. Shoot organogenesis was observed in roots of intact seedlings
pre-cultured on plain medium lacking nutrients (PM) or woody plant medium (WPM) salts and then grown on WPM salts supplemented
with 4.4 μM BA, 0.29 μM gibberrelic acid (GA3), and 57.0 μM indoleacetic acid (IAA). The number of shoots formed on each seedling
root system was ten fold higher when the pre-culture was in WPM medium indicating a promoting effect of mineral nutrients
in the pre-culture medium. Somatic embryogenesis was induced in both juvenile and adult leaf explants in 65 and 78% of the
explants, respectively, in MS-based medium supplemented with 2.0 μM N-(2-Chloro-4-pyridyl)-N
1-phenylurea (CPPU), 0.53 μM NAA and varying concentrations of BA. There was an interaction effect between MS salt strength
and BA concentration. The most effective medium for inducing somatic embryogenesis in juvenile explants contained half strength
MS salts and 2.2 μM BA and full strength MS salts and 13.2 μM BA for adult explants. 相似文献
5.
When cotyledonary explants, excised from in vitro germinated seedlings, of pomegranate (Punica granatum L.) were incubated on solid Murashige and Skoog (1962) medium supplemented with 21 μM naptheleneacetic acid (NAA) and 9 μM 6-benzyladenine (BA), 80% of explants developed callus.
A high frequency of shoot organogensis was obtained when explants were incubated on MS medium supplemented with 8 μM BA, 6 μM
NAA, and 6 μM giberrellic acid (GA3). However, adding 24 μM silver nitrate (AgNO3) to this medium markedly enhanced shoot regeneration frequency (63%) and mean number of shoots per explant (11.26) and length
of shoots (2.22 cm). Highest frequency of in vitro rooting, mean number of roots/shoot (4.32), and mean root length (2.71 cm)
were obtained when regenerated shoots were transferred to half-strength MS medium supplemented with 0.02% activated charcoal.
Well-rooted plantlets were acclimatized, and then transferred to soil medium. Moreover, when zygotic embryos of P. granatum, excised from seeds collected at 16 weeks following full bloom, were incubated on MS medium containing 30 g l−1 sucrose, 15% coconut water, 21 μM NAA, and 9 μM BA, they developed the highest frequency of embryogenic callus, clumps with
globular embryos, and mean number of both globular and heart-shaped embryos per callus clump. Subjecting zygotic embryo explants
to six-week dark incubation period was essential for embryogenic callus induction, and these were subsequently transferred
to 16 h photoperiod for further growth and development of somatic embryos. Germination of somatic embryos was observed when
these were transferred to MS medium was supplemented with 60 g l−1 sucrose. 相似文献
6.
Xingyu Yang Jinfeng Lü Jaime A. Teixeira da Silva Guohua Ma 《Plant Cell, Tissue and Organ Culture》2012,109(2):213-221
Primulina tabacum is a rare and endangered species that is endemic to China. Establishing an efficient regeneration system is necessary for
its conservation and reintroduction. In this study, when leaf explants collected from plants grown in four ecotypes in China
are incubated on Murashige and Skoog (MS) medium containing 5.0 μM thidiazuron (TDZ) for 30 days, then transferred to medium
containing 5.0 μM 6-benzyladenine (BA), adventitious shoots are then observed. Conversely, when leaf explants are incubated
on medium containing 5.0 μM BA for 30 days, then transferred to medium containing 5.0 μM TDZ, somatic embryogenesis is induced.
This indicates that somatic embryogenesis and shoot organogenesis could be switched simply by changing the order of two cytokinins
supplemented in the culture medium. Histological investigation has revealed that embryogenic cells are induced within 30 days
following incubation of explants in medium containing TDZ. Only if embryogenic cells were induced, TDZ could enhance somatic
embryogenesis and BA could stimulate shoot organogenesis. When comparing explants from different ecotypes, leaf explants
from Zixiadong in Hunan Province could induce low numbers (1–2) of either somatic embryos or adventitious shoots on medium
containing either 5.0 μM TDZ or 5.0 μM BA, respectively. Whereas, leaf explants from plants collected from the other three
ecological habitats could induce 50–70 somatic embryos/adventitious shoots per explant. Moreover, somatic embryos could induce
secondary somatic embryogenesis and adventitious shoots on different media. All regenerated shoots developed adventitious
roots when these are transferred to rooting medium, and over 95% of plantlets have survived following acclimatization and
transfer to a potting mixture (1:1, sand:vermiculite). 相似文献
7.
Wenhao Dai Yuanjie Su Cielo Castillo Olivier Beslot 《Plant Cell, Tissue and Organ Culture》2011,104(2):257-262
Shoots were regenerated from in vitro leaf tissues of two genotypes of Viburnum dentatum, a popular shrub species for landscape use. Adventitious shoots were induced when leaf tissues were cultured on woody plant
medium (WPM) supplemented with either benzyladenine (BA) or thidiazuron (TDZ). Effects of cytokinin concentration, indole-3-butyric
acid (IBA), and dark treatment on shoot regeneration were investigated. Dark treatment for the first 4 weeks of leaf explants
cultured in the regeneration medium significantly increased the frequency of regeneration. The highest frequency of shoot
regeneration (70%) for ‘Synnesvedt’ was obtained when leaf tissues were cultured in the medium with 40 μM BA or 8 μM TDZ with
4 weeks dark treatment. The highest frequency of shoot regeneration (90%) for ‘MN34’ was found in the 4 μM TDZ medium with
4 weeks dark treatment. Addition of IBA significantly enhanced shoot regeneration. Ethyl methanesulfonate (EMS) treatment
inhibited callus proliferation, particularly in the early stage of callus recovery; however, no significant difference in
shoot regeneration among different treatments was observed, indicating that the inhibitory effect of EMS was minimal after
calluses re-acquired their capacity to grow and regenerate in the regular medium. Regenerated shoots (>1.5 cm) were rooted
in the half-strength MS medium containing 5-10 μM IBA or naphthalene acetic acid (NAA). Rooted plants were transferred to
the potting medium and grown in the greenhouse. 相似文献
8.
P. Jha C. B. Yadav V. Anjaiah V. Bhat 《In vitro cellular & developmental biology. Plant》2009,45(2):145-154
An efficient in vitro plant regeneration protocol through somatic embryogenesis and direct shoot organogenesis has been developed for pearl millet
(Pennisetum glaucum). Efficient plant regeneration is a prerequisite for a complete genetic transformation protocol. Shoot tips, immature inflorescences,
and seeds of two genotypes (843B and 7042-DMR) of pearl millet formed callus when cultured on Murashige and Skoog (MS) medium
supplemented with varying levels of 2,4-dichlorophenoxyacetic acid (2,4-D; 4.5, 9, 13.5, and 18 μM). The level of 2,4-D, the
type of explant, and the genotype significantly effected callus induction. Calli from each of the three explant types developed
somatic embryos on MS medium containing 2.22 μM 6-benzyladenine (BA) and either 1.13, 2.25, or 4.5 μM of 2,4-D. Somatic embryos
developed from all three explants and generated shoots on MS medium containing high levels of BA (4.4, 8.8, or 13.2 μM) combined
with 0.56 μM 2,4-D. The calli from the immature inflorescences exhibited the highest percentage of somatic embryogenesis and
shoot regeneration. Moreover, these calli yielded the maximum number of differentiated shoots per callus. An efficient and
direct shoot organogenesis protocol, without a visible, intervening callus stage, was successfully developed from shoot tip
explants of both genotypes of pearl millet. Multiple shoots were induced on MS medium containing either BA or kinetin (4.4,
8.8, 17.6, or 26.4 μM). The number of shoots formed per shoot tip was significantly influenced by the level of cytokinin (BA/kinetin)
and genotype. Maximum rooting was induced in 1/2 strength MS with 0.8% activated charcoal. The regenerated plants were transferred
to soil in pots, where they exhibited normal growth. 相似文献
9.
Summary A method has been developed for the induction of adventitious shoots from leaf tissue of Echinacea pallida with subsequent whole-plant regeneration. Proliferating callus and shoot cultures were derived from leaf tissue explants
placed on Murashige and Skoog medium supplemented with 6-benzylaminopurine and naphthaleneacetic acid combinations. The optimum
shoot regeneration frequency (63%) and number of shoots per explant (2.3 shoots per explant) was achieved using media supplemented
with 26.6 μM 6-benzylaminopurine and 0.11 μM naphthaleneacetic acid. Rooting of regenerated shoot explants was successful on Murashige and Skoog medium, both with and
without the addition of indole-3-butyric acid. All plantlets survived acclimatization, producing phenotypically normal plants
in the greenhouse. This study demonstrates that leaf tissue of E. pallida is competent for adventitious shoot regeneration and establishes a useful method for the micropropagation of this important
medicinal plant. 相似文献
10.
The organogenic competence of leaf explants of eleven Carthamus species including C. tinctorius on Murashige and Skoog (MS) medium supplemented with different concentrations of thidiazuron (TDZ) + α-naphthaleneacetic
acid (NAA) and 6-benzyladenine (BA) + NAA was investigated. Highly prolific adventitious shoot regeneration was observed in
C. tinctorius and C. arborescens on both growth regulator combinations and the shoot regeneration frequency was higher on medium supplemented with TDZ + NAA.
Nodal culture of nine Carthamus species on media supplemented with BA and kinetin (KIN) individually revealed the superiority of media supplemented with
BA over that of KIN in facilitating a higher shoot proliferation index. Proliferating shoots from axillary buds and leaf explants
were transferred to medium supplemented with 1.0 mg dm−3 KIN or 0.5 mg dm−3 BA for shoot elongation. Elongated shoots were rooted on half-strength MS medium supplemented with 1.0 mg dm−3 each of indole-butyric acid (IBA) and phloroglucinol. The plantlets thus obtained were hardened and transferred to soil. 相似文献
11.
The effect of copper sulphate on differentiation and elongation of shoot buds from cotyledonary explants of Capsicum annuum L. cv X-235 was investigated. Shoot buds were induced on medium supplemented with 22.2 μM BAP and 14.7 μM PAA. Elongation
of shoot buds was obtained on MS medium containing 13.3 μM BAP + 0.58 μM GA3. Both shoot induction and elongation media were supplemented with different levels of CuSO4 (0–5 μM). The levels of CuSO4 in the induction as well as elongation medium highly influenced the shoot bud formation and their subsequent elongation.
Highest number of shoot buds per explant was obtained when the concentration of CuSO4 was increased 30 times to the normal MS level. Shoot buds formation frequency i.e., the number of shoots formed per explant
was increased two fold as compared to those formed on control. Elongation both in terms of percentage and length of shoots
was better than that on control. Healthy elongated shoots were rooted on MS medium supplemented with 5.7 μM IAA. Rooted plantlets
were transferred to field conditions. 相似文献
12.
B. Vinterhalter T. Janković K. Šavikin R. Nikolić D. Vinterhalter 《Plant Cell, Tissue and Organ Culture》2008,94(3):329-335
Shoot cultures of Gentianella austriaca (A. & J. Kerner) Dostal established from seedling epicotyls were maintained on MS medium supplemented with 2.22 μM BA and
0.54 μM NAA. A characteristic feature of these cultures was precocious flowering, which appeared in all rapidly elongating
shoots. Flower development arrested shoot elongation and multiplication of shoot cultures. Continuous shoot propagation was
possible only by use of small axillary or adventitious buds as explants for subculturing. Flowering could not be suppressed
by GA3 addition or by cultivation in short-day conditions. The highest rooting percentage (47.3% with 7.83 roots per explant) was
achieved on media with 4.92 μM IBA. Shoot cultures contained the same types of secondary metabolites as plants from nature.
Xanthones were the major constituents, with DMB (demethylbellidifolin), DGL (demethylbellidifolin-8-O-glucoside) and BGL (bellidifolin-8-O-glucoside) present at roughly two times lower concentrations than in samples from nature. Secondary metabolite production
was strongly affected by the presence of BA in the medium. 相似文献
13.
Guirong Qiao Jing Zhou Jing Jiang Yuehua Sun Luanyin Pan Honggai Song Jingmin Jiang Renying Zhuo Xiaojuan Wang Zongxiu Sun 《Plant Cell, Tissue and Organ Culture》2010,102(2):163-170
Malaxis acuminata is a terrestrial orchid that grows in shady areas of semi-evergreen to shrubby forests. It is highly valued for its medicinal
properties as dried pseudo-bulbs are important ingredients of several Ayurvedic preparations. In this study, adventitious
shoot buds were induced from internodal explants of M. acuminata grown on Murashige and Skoog (MS) medium supplemented with different concentrations of 6-benzyladenine (BA), kinetin (Kn),
and thidiazuron (TDZ). Of the three cytokinins used, TDZ at 3 mg l−1 induced the highest frequency (82%) of organogenic explants. However, all responding explants produced only a single adventitious
shoot irrespective of the type and concentration of the cytokinin. Adding 0.5 mg l−1 α naphthaleneacetic acid (NAA) to the medium enhanced adventitious shoot formation. In the presence of 3 mg l−1 TDZ and 0.5 mg l−1 NAA, frequency of organogenesis was 96% with a mean number of 6.1 shoots per explant. Prolonged culture or subculture on
the same medium did not promote further shoot production. However, transfer of these cultures to MS medium supplemented with
3 mg l−1 TDZ and 0.5 mg l−1 NAA and various concentrations of different polyamines (PAs), including spermine, spermidine, and putrescine, significantly
increased mean shoot number per explant. The highest frequency of shoot induction (100%) and mean shoot number per explant
(14.6) was observed on MS medium with 3 mg l−1 TDZ, 0.5 mg l−1 NAA, and 0.4 mM spermidine. Regenerated shoots were excised and subcultured on an elongation medium consisting of MS medium
with 3 mg l−1 BA. Moreover, the highest frequency of rooting (96%) and mean number of roots per shoot (3.3) was observed on MS medium with
4 mg l−1 indole-3-butyric acid (IBA) and 1.5 mg l−1 activated charcoal (AC). Almost 90% of rooted shoots were successfully acclimatized and established ex vitro. 相似文献
14.
Summary An efficient in vitro propagation system was developed for Arnebia euchroma, an important Chinese traditional medicinal plant. The present study utilized thidiazuron (TDZ) for the induction of shoot
organogenesis on cotyledon and hypocotyl explants. The maximal number of shoots was obtained on the modified Linsmaier and
Skoog (LS) medium supplemented with 1.0 mgl−1 (4.5 μM) TDZ for 12d on cotyledon explants (8.6 shoots per cotyledon explant). Other cytokinins (kinetin and 6-benzyladenine) and
auxin (α-naphthaleneacetic acid) were not efficient in inducing regeneration on cotyledon explants. Browning of the basal
portion of the subcultured shoots could be significantly reduced when they were cultured on the modified LS medium supplemented
with 100 mgl−1 (33.3 μM) polyvinylpyrrolidone. Well-developed shoots formed roots on the same medium containing 1.0 mgl−1 (4.9 μM) indole-3-butyric acid. The efficient regeneration protocol reported here provides an important means of micropropagation
of this plant. Furthermore, this protocol is essential to future genetic improvement of plants via transformation protocols. 相似文献
15.
Summary Shoot tips and leaves excised from in vitro shoot cultures of Salvia nemorosa were evaluated for their organogenic capacity under in vitro conditions. The best shoot proliferation from shoot tips was obtained on Murashige and Skoog (MS) medium supplemented with
8.9 μM 6-benzylaminopurine (BA) and 2.9 μM indole-3-acetic acid (IAA). Leaf lamina and petiole explants formed shoots through organogenesis via callus stage and/or
directly from explant tissue. The highest values for shoot regeneration were obtained with 0.9 μM BA and 2.9 μM IAA for lamina explants. No shoot organogenesis was obtained on leaf explants cultured on MS medium supplemented with α-naphthaleneacetic
acid (NAA). The regenerated shoots rooted the best on MS medium containing 0.6 μM IAA or 0.5 μM NAA. In vitro-propagated plants were transferred to soil with a survival rate of 85% after 3 mo. 相似文献
16.
This report deals with micropropagation of the critically endangered and endemic Turkish shrub, Thermopsis turcica using callus, root and cotyledonary explants. Callus cultures were initiated from root and cotyledon explants on MS medium
supplemented with 0.5–20 μM NAA or 2,4-D. The root explants were found to be better in terms of quick responding and callusing
percentages as compared to the cotyledons. Organogenic callus production with adventitious roots and shoots were obtained
on MS medium with only NAA. The calli obtained with NAA, root and cotyledonary explants were cultured with BA and kinetin
(2–8 μM) alone or in combination with a low level (0.5 μM) of 2,4-D or NAA. The best regeneration of shoots from root explants
was observed on hormone-free MS medium. NAA with BA or kinetin in the medium improved shoot induction from the calli obtained
with NAA. Maximum percentage of shoots (93.3%), maximum number of shoots (6.2) and maximun length of shoots (8.22 cm) were
achieved from cotyledonary explants at 4 μM BA and 0.5 μM NAA. The presence of 0.5 μM or higher levels of 2,4-D in shoot induction
medium inhibited the regeneration in T. turcica explants. 83% of in vitro rooting was attained on pulsed-IBA treated shoots. The regenerated plants with well developed shoots and roots were successfully
acclimatized. Application of this study’s results has the potential to conserve T. turcica from extinction. 相似文献
17.
Elif Aylin Ozudogru Ergun Kaya Emrah Kirdok Saliha Issever-Ozturk 《In vitro cellular & developmental biology. Plant》2011,47(2):309-320
An efficient in vitro propagation protocol, applicable both to young and mature explants of two Thymus spp., results in genetically stable plantlets. In vitro-grown shoot tips of Thymus vulgaris L. were exposed to cytokinins (6-benzyladenine, kinetin, and thidiazuron) alone or in combination with auxins, gibberellic
acid (GA3) and/or silver nitrate in order to optimize in vitro shoot proliferation. Optimum shoot proliferation (97% regeneration rate, with 8.6 shoots produced per explant) was obtained
when semi-solid Murashige and Skoog (MS) medium was supplemented with 1 mg L−1 kinetin and 0.3 mg L−1 GA3. Rooting of the shoots was easily obtained on semi-solid MS medium that was either hormone-free or supplemented with auxins.
However, the best root apparatus (92.5% rooting rate, with 19 adventitious roots per shoot) developed on MS medium supplemented
with 0.05 mg L−1 2,4-dichlorophenoxyacetic acid. Genetic stability was confirmed in the in vitro-germinated mother plant as well as the shoots that underwent two, four, six, eight, or ten cycles of in vitro subculturing by random amplified polymorphic DNA (RAPD) analysis. When applied to the micropropagation of mature shoot tips
of T. longicaulis C. Presl subsp. longicaulis var. subisophyllus (Borbás) Jalas, the optimized in vitro propagation protocol resulted in a 97.5% shoot regeneration rate, with five shoots formed per explant, and 100% rooting.
Rooted plantlets of both species were transferred to 250-mL plastic pots and successfully acclimatized by gradually reducing
the relative humidity. 相似文献
18.
Mehmet Nuri Nas Leyla Gokbunar Nevzat Sevgin Murat Aydemir Merve Dagli Zahide Susluoglu 《Plant Growth Regulation》2012,67(1):57-63
The effects of culture media and cytokinin types on micropropagation of mature Crataegus aronia L. were investigated. Using single-axillary bud explants, the growth of cultures on MS, WPM, DKW and NRM containing 4.44 μM
benzyladenine (BA) plus 0.05 μM indole-3-butyric acid (IBA), and on NRM containing thidiazuron, meta-Topolin (mT) or BA at
1.25, 2.5, 5.0 or 7.5 μM plus 0.05 μM IBA were compared. The culture medium had significant effects on shoot number and length.
In comparison with MS, DKW and WPM, shoot production was greater on NRM (5.7 shoots per explant). Shoot production on MS,
DKW and WPM (4.2, 4.2 and 4.1, respectively) were statistically similar to each other. Thidiazuron was detrimental to shoot
formation and caused formation of rosette shoots and/or large callus to form on explants. In the presence of mT, only some
of the explants developed into shoots. Benzyladenine was the only cytokinin that promoted both shoot proliferation and shoot
elongation. Higher shoot numbers were obtained at 5.0 and 7.5 μM BA compared to lower concentrations of BA. Over 80% of microshoots
rooted and rooted shoots were successfully acclimatized to ex vitro conditions. 相似文献
19.
K. Samuel D. Debashish B. Madhumita G. Padmaja Siva Ram Prasad V. Bhaskara Ramana Murthy P. S. Rao 《In vitro cellular & developmental biology. Plant》2009,45(4):466-473
The propagation of Givotia rottleriformis Griff. is difficult as a result of long seed dormancy associated with poor seed germination. The present study was undertaken
to develop a protocol to overcome seed dormancy by culture of zygotic embryo axes and then develop an efficient method for
micropropagation of Givotia. Best germination frequency (78.3%) was achieved from mature zygotic embryo axes isolated from acid-scarified fresh seeds
when cultured on Murashige and Skoog (MS) medium (half-strength major salts) with 28.9 μM gibberellic acid (GA3). Efficient plant conversion was achieved by transfer of 10-d-old germinated embryos to MS medium (half-strength major salts)
supplemented with 1.2 μM kinetin (KN) and 0.5 μM indole-3-butyric acid (IBA). However, acid scarification of 1-yr-old seeds
decreased the germination frequency of zygotic embryo axes in comparison to those obtained from non-acid-scarified seeds which
germinated (96.2%) and converted into plants (80.3%) on MS basal (half-strength major salts) medium. Multiple shoot bud induction
was achieved by culture of shoot tips derived from in vitro germinated seedlings on MS medium with 0.5 μM thidiazuron for 4 wk, and the shoots elongated after transfer to a secondary
medium with 1.2 μM KN. A maximum number of 7.8 shoots per explant with an average shoot length of 3.2 cm was achieved after
two subcultures on this medium. The in vitro regenerated shoots rooted (41.5%) on half-strength MS medium with 0.5 μM IBA. The in vitro generated seedlings and micropropagated plants were established in soil with a survival frequency of 70% and 60%, respectively. 相似文献
20.
A novel protocol for callus-mediated shoot regeneration was established for an important medicinal and ornamental plant native
to South China, Curcuma kwangsiensis, using shoot base sections excised from seedlings in vitro as explant sources. The frequency of callus formation reached
91% for explants cultured on MS medium containing 1.4 μM TDZ, 4.4 μM BA and 2.3 μM 2,4-D. 8.2 shoots per callus was achieved
on MS medium supplemented with 1.4 μM TDZ, 17.8 μM BA and 2.7 μM NAA. Single shoots transferred into MS medium free of plant
growth regulator rooted well. Regenerated plants acclimatized ex vitro at 100%, and grew vigorously under shaded greenhouse
conditions. 相似文献