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1.
G. G Ning S. P Bai M. Z Bao L. Liu 《In vitro cellular & developmental biology. Plant》2007,43(2):95-100
Using immature embryos and cotyledons as explants, a successful system to culture immature embryos and induce direct regeneration
from cotyledons was established for Prunus mume “Xuemei”. For immature embryo culture, a high frequency of plantlet formation (89.5%) from the embryonic axis was obtained
using half-strength Murashige and Skoog (1/2 MS) medium supplemented with 13.2 μM 6-benzyladenine (BA) and 2.7 μM 1-naphthaleneacetic
(NAA). Shoots formed directly from cotyledons with the embryo axis intact when explants were cultured on 1/2 MS medium containing
2.2 μM BA with different combinations of NAA (2.7, 5.4 μM) and indole-3-butyric acid (IBA) (0, 2.5, 5.0 μM). Better results
were achieved when the embryonic axis was removed from the cotyledons and cultured on 1/2 MS medium supplement with 13.2 μM
BA, 2.7 μM NAA or 2.2 μM BA, 2.2 μM thidiazuron (TDZ), and 2.7 μM NAA, respectively. Regenerated shoots were successfully
rooted on 1/2 MS or Woody Plant medium (WPM) supplemented with 2.5–5.0 μM IBA. The effect of the embryonic axis, BA, and TDZ
on cotyledon regeneration was investigated in detail. Rooted plantlets were transferred to soil successfully. 相似文献
2.
Mustapha Benmoussa Sandip Mukhopadhyay Yves Desjardins 《Plant Cell, Tissue and Organ Culture》1997,47(1):91-94
The effects of different growth regulators on induction and growth of callus ofAsparagus densiflorus cv. Sprengeri were studied. Calluses grew more rapidly on Murashige and Skoog basal medium supplemented with 5.4 μM p-chlorophenoxyacetic
acid (pCPA) and 4.4 μM 6-benzylaminopurine (BA) (medium 1) as compared to the same medium with 11.3 μM 2,4-dichlorophenoxyacetic
acid (2,4-d) and 4.6 μM kinetin (medium 2). Calluses on medium 1 were soft and friable, whereas, compact, hard calluses originated on
medium 2. Different concentrations and combinations of BA and/or kinetin were also used to study their effects on shoot regeneration.
Kinetin was found to be less effective than BA in the initiation of shoots (1.8 shoots/callus). High numbers of shoots were
produced in the presence of 0.4 μM BA alone (3.3 shoots/callus). The addition of ancymidol (5 μM) in MS with 0.4 μM BA enhanced
multiplication of shoots (9.8 shoots/explant) and also produced well-developed crowns. 相似文献
3.
Shoot bud regeneration was obtained from isolated leaflets of Albizia procera cultured on MS medium with various concentrations
of 6-benzyladenine (BA) and α-naphthaleneacetic acid (NAA). The highest numbers of adventitious buds were obtained on MS medium
supplemented with 10 μM BA and 1 μM NAA. The replacement of 7 g l-1 Difco bacto agar with 2.6 g l-1 Phytagel in the medium
enhanced adventitious bud regeneration. Further, addition of 15 μM silver nitrate promoted callus-free shoot regeneration
from leaf explants. The regenerated shoot buds were elongated on MS medium containing 0.01 μM BA and 1 μM NAA. Rooting was
obtained on modified MS medium supplemented with 2 μM IBA. To our knowledge this is the first report of direct regeneration
of shoots from leaflet explants in A. procera, and should help facilitate genetic transformation in this species.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
4.
Suresh Chand Ashok Kumar Sahrawat 《In vitro cellular & developmental biology. Plant》2002,38(1):33-38
Summary An efficient plant regeneration protocol has been developed from root explants of Psoralea corylifolia L., an endangered medicinally
important herbaceous plant species belonging to the family Fabaceae. Nodular embryogenic callus was initiated from young root
segments cultured on Murashige and Skoog (MS) medium (1962) supplemented with α-naphthaleneacetic acid (NAA; 2.68–13.42 μM)
or 2,4-dichlorophenoxyacetic acid (2.4-D; 2.25–11.25 μM) in combination with 6-benzylaminopurine (BA: 2.2. μM). thiamine HCl
(2.9 μM), L-glutamine (342.23 μM) and sucrose (3.0% w/v). The highest frequency (95.2%) of embryogenic calluses was obtained on MS medium
supplemented with the growth regulators NAA (10.74 μM) and BA (2.2 μM). Development and maturation of somatic embryos was
achieved after transfer of embryogenic calluses to MS medium supplemented with 1.34 μM NAA or 1.12 μM 2,4-D and 4.4–13.2 μM
BA. The maximum number (13.8±1.34) of cotyledonary stage somatic embryos was obtained on MS medium containing 1.34 μM NAA
and 13.2 μM BA. Germination of somatic embryos occurred on MS medium without any growth regulators and also on MS medium enriched
with BA (1.1–8.8 μM), although the maximum germination frequency (76.1%) was obtained on 4.4 μM BA plus 1.45 μM gibberellic
acid (GA3). Plant regeneration without complete somatic embryo maturation was also achieved by transferring clumps of nodular embryogenic
calluses onto MSO medium or MS medium supplemented with NAA (1.34 μM) and BA (2.2–8.8 μM). The highest frequency of plant
regeneration (93.3%) and mean number of plantlets (15.4±0.88) were obtained on MS medium containing 1.34 μM NAA and 4.4 μM
BA. Regenerated plants with well-developed root systems were transferred to pots where they grew vigorously, attained maturity
and produced fertile seeds. 相似文献
5.
Pranati Nayak P. R. Behera Thirunavoukkarasu Manikkannan 《In vitro cellular & developmental biology. Plant》2007,43(3):231-236
High frequency plantlet regeneration was achieved in cotyledonary nodes of Aegle marmelos. Cotyledonary nodes from 1 mo. old in vitro grown seedlings of A. marmelos were cultured on Murashige and Skoog (MS) medium supplemented with benzyl adenine (BA) (0–8.8 μM), kinetin (KIN) (0–9.4 μM),
and indole-3-acetic acid (IAA) (0–1.14 μM) either alone or in combinations. The highest regenerative response was observed
on medium containing 6.6 μM BA + 1.14 μM IAA where approximately 86.6% of the cultures responded with an average shoot numbers
of 487.5 per explant in 7-wk time. Cultures maintained on KIN-supplemented medium showed very poor response. In vitro responded shoots were transferred to root induction medium consisting of half-strength MS supplemented with auxins IAA, indole-3-butyric
acid (IBA), or α-naphthalene acetic acid (NAA). Rooting was best in medium supplemented with 14.7 μM IBA. Rooted plantlets
were acclimatized and transferred to the field with 80% survival rate. 相似文献
6.
Adventitious bud formation in Alhagi graecorum 总被引:1,自引:0,他引:1
Various parts of seedlings and in vitro propagated shoots of Alhagi graecorum Boiss were cultured on different media with different 6-benzyladenine (BA) and kinetin (KIN) concentrations to compare their
potential to regenerate shoots. Murashige and Skoog (MS) medium with 2.5 μM BA and hypocotyl gave the best results. Callus
was obtained from stem segments on MS medium supplemented with 2.5 μM BA, 5 μM 1-naphthaleneacetic acid (NAA) and 0.5 μM 2,4-dichlorophenoxyacetic
acid (2,4-D). Shoot formation from callus occurred upon its transfer to MS medium supplemented with 2.5 μM BA. Mature explants which
showed a relatively low potential for adventitious buds or callus formation, regenerated shoots abundantly using the tiny-mature-explant
method. The regenerated shoots were rooted on half strength MS medium supplemented with 5 μM 3-indolebutyric acid (IBA).
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
7.
Azza A. Tawfik Mohamed F. Mohamed 《In vitro cellular & developmental biology. Plant》2007,43(1):21-27
Nodular meristematic callus was induced on the basal cut surface of apical shoot explants of salvia cultured on Murashige
and Skoog (MS) medium supplemented with 4.5, 13.5, or 22.5 μM thidiazuron (TDZ). Cultures were incubated in the dark for 1 wk
and then transferred to light conditions for 4 wk. A higher percentage of explants developing callus was observed on medium
containing either 4.5 or 13.5 μM TDZ, although explants on 4.5 μM developed larger calluses. The callus was maintained on
medium containing 4.5 μM TDZ and 0.45 mM ascorbic acid. Shoot differentiation, after each of three successive maintenance
passages, was induced from callus grown on medium containing either 4.4 or 8.8 μM benzyladenine (BA). A greater number of
shoots were harvested from callus differentiated on BA (4.4 or 8.8 μM) medium with 0.45 mM ascorbic acid added. Shoots developed
roots on MS medium supplemented with 4.9 μM of indole-3-butyric acid. The addition of ascorbic acid to the shoot differentiation
medium enhanced rooting, number of roots per shoot, and survival rate. Approximately 75% in vitro plantlets were acclimatized to ex vitro conditions. Histological investigations confirmed both adventitious meristem initiation during the callus induction phase,
and subsequent organogenic shoot development on the differentiation medium. The novel protocol for the meristematic callus
induction and plant regeneration in this study may be useful for biotechnological applications for salvia improvement via
genetic transformation or mutagenesis and in vitro propagation approaches. 相似文献
8.
In vitro mother plants initiated from a mature tree of Sorbus aucuparia, produced numerous propagules on a medium containing 2 μM 6-benzylaminopurine (BAP) and 0.2 μM 1-naphthaleneacetic acid (NAA).
These were rooted on a medium containing 0.25 μM NAA and 0.25 μM indole−3-butyric acid. Adventitious shoots were produced
on excised leaves and internodes on media containing 10 μM thidiazuron and 0.3–1.0 μM NAA. They formed by direct regeneration
in the axils of leaflets of intact leaves. They also developed indirectly, from callus that developed on the rachis of intact
leaves, and the cut ends of petioles and internodes. Somatic embryos were produced on cotyledons of zygotic embryos on medium
containing 1 μM BAP, 1 μM kinetin, 0.5 μM NAA, 500 mg l−1 casein hydrolysate and 250 mg l−1 glutamine. On basal medium, 69% developed cotyledons and 20% germinated after pre-treatment at 4 °C on medium containing
30 g l−1 maltose. 相似文献
9.
Justicia gendarussa is a valuable medicinal plant and various parts of this plant are pharmaceutically used for the treatment of different diseases.
In vitro regeneration of shoot buds was obtained from culture of nodal cuttings as well as shoot regeneration from callus.
The nodal cuttings differed in shoot proliferation in terms of percentage of explants that responded and average shoot length
with various concentrations (4.4, 8.9, 13.3, 17.7, 22.2 μM) of 6-benzyladenine (BA), kinetin (Kn) and thidiazuron. In all
treatments, one shoot was invariably present. Optimum 87% of cultures responded with an average shoot length of 4.4 cm on
Murashige and Skoog (MS) medium supplemented with 17.7 μM BA. Callus was induced from the mature leaf segments on MS medium
supplemented with Kn (4.7, 13.9, 23.2 μM) alone or in combination with 2, 4-dichlorophenoxyacetic acid (2, 4-D; 2.3 μM, 4.5 μM).
Optimum callus induction (78%) was obtained on MS medium supplemented with 14 μM Kn and 4.5 μM 2, 4-D. When the callus was
subcultured on MS medium fortified with BA (8.9, 17.7, 26.6 μM) or Kn (9.3, 18.6, 27.9 μM) alone or in combination with α
naphthalene acetic acid (NAA; 2.7, 5.4 μM), shoot regeneration was obtained. The highest response (92%) was observed on MS
medium containing 17.7 μM BA and 5.4 μM NAA. On this medium, an average number of 12.2 shoots were obtained per responding
callus. The shoots obtained from callus and nodal cuttings were rooted with a frequency of 73% on MS medium augmented with
9.8 μM indole-3-butyric acid. The rooted shoots were successfully transplanted to soil and sand mixture (1:1) with 90% survival
rate. The protocol standardized for shoot proliferation and regeneration in J. gendarussa from nodal cuttings and leaf-derived callus is suitable for micropropagation and conservation of this essential medicinal
plant. 相似文献
10.
Somatic embryogenesis was induced in embryogenic calli of Spinacia oleracea L., on a Murashige and Skoog (1962) medium, containing
4.6 μM kinetin as the sole growth regulator. Abscisic acid, gibberellic acid, and indole-3-acetic acid were supplemented to
kinetin-containing medium and their effects on the initiation of somatic embryos was studied. Abscisic acid at a particular
concentration (4 μM) dramatically increased the number of embryos per g fresh weight of callus, while both gibberellic acid
and indole-3-acetic acid suppressed the embryo initiation. It is suggested that the promoting effect of abscisic acid on the
embryo initiation may be explained as a stress response of the tissue. The relative number of globular embryos vs. the embryos
in heart/torpedo and cotyledonary stages was increased at 4 μM abscisic acid and at all gibberellic acid concentrations (0.3–10
μM). In contrast, the ratio of globular to polar embryos was lower than in controls at 1 μM abscisic acid and indole-3-acetic
acid (1 and 10 μM). The effects of growth regulators on the ratio of globular to polar embryos indicate that they interfere
with the normal distribution of cell division and cell expansion during early embryogenesis.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
11.
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
12.
A procedure is outlined for the establishment of a proliferating cell suspension culture and subsequent plant regeneration
of the latex-producing plant,Calotropis gigantea (Linn.) R. Br. Friable calluses were obtained by culturing hypocotyl explants on modified Murashige and Skoog medium with
2.69 μM α-naphthaleneacetic acid and 4.44 μM 6-benzyl-aminopurine. Friable calluses were transferred to modified Murashige
and Skoog liquid medium containing 500 mg l−1 casein hydrolysate, 5% (v/v) coconut water and 5% (w/v) sucrose to initiate suspension cultures. Suspensions were subcultured
every 10–12 days and supplemented with 13.56 μM 2,4-dichlorophenoxyacetic acid (2,4-D). After 3–4 subcultures, suspensions
consisted of small, highly cytoplasmic cell clumps and large vacuolate cells. Plating the suspension clumps on medium containing
4.52 μM 2,4-dichlorophenoxyacetic acid and culturing in darkness produced macroscopic calluses, which subsequently produced
a high number of shoots when placed in light and supplemented with 2.22 μM 6-benzyl-aminopurine and 0.45 μM 2,4-dichlorophenoxyacetic
acid. Shoots were rooted using Bonner's solution containing 0.49 μM indole-3-butyric acid, and the plants successfully transferred
to soil.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
13.
Vengadesan G. Ganapathi A. Prem Anand R. Ramesh Anbazhagan V. 《Plant Cell, Tissue and Organ Culture》2000,61(1):23-28
In vitro morphogenesis via organogenesis was achieved from callus cultures derived from hypocotyl explants of Acacia sinuata on MS (Murashige and Skoog, 1962) medium. Calli were induced from hypocotyl explants excised from 7-day-old seedlings on
MS medium containing 3% sucrose, 0.8% agar, 6.78 μM 2,4-dichlorophenoxyacetic acid and 2.22 μM 6-benzylaminopurine. Regeneration
of adventitious buds from callus was achieved when they were cultured on MS medium supplemented with 10% coconut water, 13.2
μM 6-benzylaminopurine and 3.42 μM indoleacetic acid. Addition of gibberellic acid (1.73 μM) favored shoot elongation. Regenerated
shoots produced prominent roots when transferred to half strength MS medium supplemented with 7.36 μM indolebutyric acid.
Rooted plantlets, thus developed were hardened and successfully established in the soil. This protocol yielded an average
of 20 plants per hypocotyl explant over a period of 4 months.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
14.
M. A. K. Azad S. Yokota F. Begum N. Yoshizawa 《In vitro cellular & developmental biology. Plant》2009,45(4):441-449
Somatic embryogenesis and subsequent plant regeneration were established from hypocotyl and internode explants collected from
in vitro-grown seedlings and in vitro-proliferated shoots, respectively. Somatic embryogenesis was significantly influenced by the types of auxin and cytokinin.
Friable calluses with somatic embryos developed well in Murashige and Skoog basal (MS) medium supplemented with 0.8–8.8 μM
6-benzylaminopurine (BA) and 2.0–8.0 μM 2,4-dichlorophexoxyacetic acid (2,4-D) or α-naphthaleneacetic acid (NAA). The maximal
frequency of embryogenic callus and somatic embryo formation were obtained when the MS medium was amended with 8.8 μM BA and
4.0 μM 2,4-D. The best embryo germination occurred in a hormone-free 1/2-MS medium. The highest percentage of shoot proliferation
was observed in embryogenic calluses in MS medium containing 2.0 μM BA and 1.0 μM NAA. In vitro-grown shoots were rooted in MS medium with 0.5–2.0 μM indole-3-butyric acid. Regenerants were transferred to vermiculite and
successfully established under an ex vitro environment in garden soil. 相似文献
15.
Micropropagation of Pinus heldreichii 总被引:2,自引:0,他引:2
Stojicić Dragana Budimir Snezana Ćulafić Ljubinka 《Plant Cell, Tissue and Organ Culture》1999,59(2):147-150
Micropropagation by organogenesis from mature embryos of Pinus heldreichii Christ. was achieved. The frequency of adventitious bud induction was higher on embryos grown on Gresshoff and Doy medium
than on Von Arnold and Eriksson, or Murashige and Skoog medium. The greatest number of buds and developed shoots was obtained
after induction with benzyladenine at 2.22 or 4.40 μM for four weeks. Shorter induction time was less effective for bud induction,
but subsequent shoot elongation was accelerated. Shoots elongated on half-strength, growth regulator-free medium supplemented
with activated charcoal. After pulse treatment with 1 mM indole-3-butyric acid twenty shoots were rooted, while agar-solidified
medium supplemented with α-naphthaleneacetic acid (0.27 or 1.08 μM), or indole-3-butyric acid (0.25 or 0.98 μM) induced callus
formation only.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
16.
A continuously growing callus was obtained from immature endosperm of Morus alba L Cv S-36 cultured on Murashige and Skoog medium containing 5 μm 2,4-dichlorophenoxyacetic acid. Shoot buds were produced
when the callus was subcultured on a medium containing a cytokinin or a cytokinin and 1-naphthaleneacetic acid (NAA). The
maximum number of shoots was formed on the medium containing thidiazuron (1 μM), or benzylaminopurine (5 μM) and NAA (1 μM).
Shoots were multiplied by forced axillary branching and rooted in vitro. Endosperm-derived plants were established in soil.
Each of the ten plants examined cytologically was triploid (3 n=42).
Received:17 February 1999 / Revision received: 4 May 1999 / Accepted: 19 May 1999 相似文献
17.
Multiple shoot induction and callus regeneration in Sarcostemma brevistigma Wight & Arnott, a rare medicinal plant 总被引:1,自引:0,他引:1
An efficient micropropagation protocol based on multiple shoot induction and callus regeneration has been standardized in
Sarcostemma brevistigma, a rare medicinal plant. The nodal cuttings were cultured on MS medium supplemented with BA (0.5–8 μM) or Kn (0.5–8 μM) alone
or in combination with NAA (0.5–1.5 μM). Maximum multiple shoot induction was observed on MS medium supplemented with 4 μM
BA. On this medium, 100% cultures responded with an average number of 11.3 shoots per explant. However, the average shoot
length was limited to only 0.9 cm on this medium. The addition of 1 μM NAA along with 4 μM BA gave rise to an average number
of 10.9 shoots with an average shoot length of 1.8 cm. Luxuriantly growing callus was obtained on MS medium supplemented with
BA (5 μM) and 2,4-D (2 μM). The callus was subcultured on MS medium supplemented with BA (2–15 μM) or Kn (2–15 μM) alone or
in combination with NAA (0.5–2 μM) for shoot organogenesis. Optimum callus regeneration was obtained on MS medium supplemented
with 10 μM BA and 1 μM NAA. On this medium, 100% cultures responded with an average number of 13.4 shoots per culture. The
shoots obtained via multiple shoot induction and organogenesis were rooted on half-strength MS medium supplemented with NAA
(1–7 μM) or IBA (1–7 μM). IBA was better than NAA in terms of both the percentage of cultures that responded and the average
number of roots per explant. The rooted shoots were successfully transplanted to soil with 86% success. This standardized
protocol will help to conserve this rare medicinal plant. 相似文献
18.
In vitro regeneration of Acacia mangium via organogenesis 总被引:1,自引:0,他引:1
Plant regeneration of Acacia mangium was achieved through organogenesis in callus cultures. Calli were induced from five types of explants (embryo axes and cotyledons
of mature zygotic embryos as well as leaflets, petioles and stems of seedlings) of A. mangium on MS (Murashige and Skoog, 1962) basal medium containing 9.05 μM 2,4-dichlorophenoxyacetic acid (2,4-D) and 13.95 μM kinetin (KT). Green or green purple compact nodules containing clusters of meristematic centers were induced
in these calli after transfer to MS basal medium containing 1.14–22.75 μM thidiazuron (TDZ) and 1.43–2.86 μM indole-3-acetic acid (IAA). A combination of 4.55 μM TDZ and 1.43 μM IAA promoted the
highest percentage of calli to form nodules, in 8–11% of calli derived from cotyledons, embryo axes, leaflets or petiole and
in 4% of calli derived from stems. Twenty-two percent of the nodules formed adventitious shoots on MS basal medium containing
0.045 μM TDZ. Shoots were elongated on MS medium containing 0.045 μM TDZ supplemented with 7.22 μM gibberellic acid. The medium
containing 10.75 μM NAA and 2.33 μM KT promoted rooting of 10% of the elongated shoots. Plantlets grew up well in the green house.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
19.
A simple, high frequency, and reproducible method for plant regeneration through direct organogenesis from cotyledonary leaf
explants of Jatropha curcas was developed using Murashige and Skoog (MS) medium supplemented with different concentrations of thidiazuron (TDZ) or 6-benzyl
aminopurine (BAP). Medium containing TDZ has greater influence on regeneration as compared to BAP. The induced shoot buds
were transferred to MS medium containing 10 μM kinetin (Kn), 4.5 μM BAP, and 5.5 μM α-naphthaleneacetic acid (NAA) for shoot
proliferation. The proliferated shoots could be elongated on MS medium supplemented with different concentrations and combinations
of BAP, indole-3-acetic acid (IAA), NAA, and indole-3-butyric acid (IBA). MS medium with 2.25 μM BAP and 8.5 μM IAA was found
to be the best combination for shoot elongation. However, significant differences in plant regeneration and shoot elongation
were observed among the genotypes studied. Rooting was achieved when the basal cut end of elongated shoots were dipped in
half strength MS liquid medium containing different concentrations and combinations of IBA, IAA, and NAA for 4 days, followed
by transfer to growth regulators free half strength MS medium supplemented 0.25 mg l−1 activated charcoal. Elongated shoot treated with 15 μM IBA, 5.7 μM IAA, and 11 μM NAA resulted in highest percent rooting.
The rooted plants could be established in soil with more than 90% survival rate. The method developed may be useful in improvement
of J. curcas through genetic modification. 相似文献
20.
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