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Zeatin

About: Zeatin is a research topic. Over the lifetime, 2467 publications have been published within this topic receiving 64092 citations. The topic is also known as: Zeatin & (E/Z)-zeatin.


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Journal ArticleDOI
TL;DR: One to five percent of Lycopersicon peruvianum (L.) Mill undergo cell division and concomitant organization to form embryogenic-like structures when cultured in Murashige and Skoog medium (1962).
Abstract: One to five percent of Lycopersicon peruvianum (L.) Mill. leaf mesophyll protoplasts undergo cell division and concomitant organization to form embryogenic-like structures when cultured in Murashige and Skoog medium (1962) containing 3% sucrose, 9% mannitol, 1.0 mg/l kinetin (K) and 1.0 mg/l naphthalene acetic acid (NAA) at pH 5.6–5.8 (medium A). These embryogenic structures, after passing through developmental stages similar to those observed in zygotic embryogeny, are capable of forming shoots on hormone-free medium A. In medium B, wherein 0.5 mg/l of 2,4-dichlorophenoxyacetic (2,4-D) replaced the hormones (K and NAA), embryogenic structures did not develop. However, callus originating in medium B retained morphogenetic capacity as was evidenced by subsequent shoot regeneration when they were transferred to medium A with K and NAA replaced by 1.0 mg/l zeatin (Z). The potential value of incorporating this regeneration trait into Lycopersicon species and cultivated lines for use in tissue culture programs is discussed.

38 citations

Journal ArticleDOI
TL;DR: Addition of auxins or abscisic acid to the organogenic medium (3% sucrose) induced somatic embryogenesis whereas addition of auxin polar transport inhibitors led to shoot formation under otherwise embryogenic conditions (12% Sucrose).

38 citations

Journal ArticleDOI
TL;DR: Shoots proliferation and elongation were strongly improved by the combination BAP/IAA in the presence of low salt media, like Gresshoff and Doy or Woody Plant medium, and rates were significantly increased when a double-phase culture system was used.

38 citations

Journal ArticleDOI
TL;DR: The data suggest that the flux of minerals and cytokinin from the roots could influence foliarsenescence in soybeans, but increased stomatal resistance does not seem to cause foliar senescence.
Abstract: Excised soybean (Glycine max [L] Merrill) cv Anoka leaf discs tend to remain green even after the corresponding intact leaves have turned yello on fruiting plants We have found that explants which include a leaf along with a stem segment (below the node) and one or more pods (maintained on distilled H(2)O) show similar but accelerated leaf yellowing and abscission compared with intact plants In podded explants excised at pre-podfill, the leaves begin to yellow after 16 days, whereas those excised at late podfill begin to yellow after only 6 days Although stomatal resistances remain low during the first light period after excision, they subsequently increase to levels above those in leaves of intact plants Explants taken at mid to late podfill with one or more pods per node behave like intact plants in that pod load does not affect the time lag to leaf yellowing Explant leaf yellowing and abscission are delayed by removal of the pods or seeds or by incubation in complete mineral nutrient solution or in 46 micromolar zeatin Like chorophyll breakdown, protein loss is accelerated in the explants, but minerals or especially zeatin can retard the loss Pods on explants show rates and patterns of color change (green to yellow to brown) similar to those of pods on intact plants These changes start earlier in explants on water than in intact plants, but they can be delayed by adding zeatin Seed dry weight increased in explants, almost as much as in intact plants Explants appear to be good analogs of the corresponding parts of the intact plant, and they should prove useful for analyzing pod development and mechanisms of foliar senescence Moreover, our data suggest that the flux of minerals and cytokinin from the roots could influence foliar senescence in soybeans, but increased stomatal resistance does not seem to cause foliar senescence

38 citations

Journal ArticleDOI
TL;DR: In this article, the authors showed that ABA was accumulated by the bud in relatively larger amounts during the final stages of bud dormancy (I-1 and I-2) than in the earlier stage (F-2).
Abstract: Summary The dormant phase of the flush cycle of leaf growth in cocoa is known to be correlated with high abscisic acid (ABA) levels in the mature leaves of the new flush (NF) and previous flush (PF) leaves. Defoliation of either the NF leaves or PF leaves of cocoa seedlings reduced the length of the dormant phase of the flush cycle, thus showing that the mature leaves were a source of growth inhibitors which could affect shoot apical activity. The application of ABA to the NF and PF leaves led to an extension of the dormant phase, whereas application of zeatin or gibberellic acid decreased it. The distribution of [14C]ABA following its application to NF and PF leaves at different stages throughout the growth cycle showed that [14C] ABA was accumulated by the bud in relatively larger amounts during the final stages of bud dormancy (I-1 and I-2) than in the earlier stage (F-2). The results suggest that internal competition for nutrients may be responsible for the inhibition of growth at the F-2 stage but that ABA translocated from the mature leaves causes the buds to remain dormant during the subsequent stages of I-1 and I-2.

38 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202333
2022103
202135
202034
201932
201848