Topic
Gibberellic acid
About: Gibberellic acid is a research topic. Over the lifetime, 6597 publications have been published within this topic receiving 109294 citations. The topic is also known as: GIBBERELLIN A3.
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TL;DR: The production of transgenic potato shoots within 4 weeks from the time of initial inoculation of leaf explants by Agrobacterium tumefaciens has been established with the Solanum tuberosum subspecies andigena.
107 citations
TL;DR: It is found that α-amylase mRNA fails to accumulate in embryoless barley half-seeds treated with gibberellic acid, indicating that the action of anoxia may be at the transcriptional level.
Abstract: The effect of anoxia on the induction of α-amylase in seeds of rice (Oryza sativa L.), wheat (Triticum aestivum L.), barley (Hordeum vulgare L.), oat (Avena sativa L.) and rye (Secale cereale L.) was studied. The results showed that only rice is able to synthesize α-amylase under anoxia, while other cereal seeds fail to produce the enzyme and do not germinate. The inhibitory effect of anoxia on α-amylase induction is concluded to be due to the inability of cereal seeds to respond to gibberellic acid under conditions of total oxygen deprivation. Rice appears to be an exception to this rule among the cereal seeds tested. We found that α-amylase mRNA fails to accumulate in embryoless barley half-seeds treated with gibberellic acid, indicating that the action of anoxia may be at the transcriptional level.
107 citations
TL;DR: It is concluded that both GA3 and ABA regulate protein synthesis both positively and negatively in aleurone cells largely by regulating levels of mRNA and in the case of α-amylase, possibly also by changing the efficiency of translation of its mRNA.
Abstract: Using in vivo pulse labeling, changes in the pattern of protein synthesis were detected in isolated barley aleurone layers treated with fibberellic acid (GA3). GA3 greatly altered the relative rates of synthesis of many polypeptides, increasing some, notably α-amylase, and decreasing others. α-Amylase synthesis increased until it was the major product (over 60%) of protein synthesis after 24h. The pulse-labeled pattern of secreted polypeptides was also changed by GA3. There was the expected increase in α-amylase together with a number of other polypeptides but there was reduced secretion of several polypeptides also.
107 citations
TL;DR: It is suggested that both haulm growth and tuber initiation are influenced by a common hormonal control, and that temperature exerts its influence by altering the balance between the levels of endogenous gibberellins and inhibitors.
106 citations
TL;DR: Application of gibberellic acid (4+7) (100 microliters per liter) resulted in earlier germination at 15degree C and 25 degrees C and decreased endosperm strength sooner than in untreated seeds and high O(2) concentrations had similar effects on germination earliness and endos sperm strength decline.
Abstract: Decoated pepper ( Capsicum annuum L. cv Early Calwonder) seeds germinated earlier at 25°C, but not at 15°C, compared to coated seeds. The seed coat did not appear to impose a mechanical restriction on pepper seed germination. Scarification of the endosperm material directly in front of the radicle reduced the time to germination at both 15°C and 25°C. The amount of mechanical resistance imposed by the endosperm on radicle emergence before germination was measured using the Instron Universal Testing Machine. Endosperm strength decreased as imbibition time increased. The puncture force decreased faster when seeds were imbibed at 25°C than at 15°C. The reduction in puncture force corresponded with the ability of pepper seeds to germinate. Most radicle emergence occurred at 15°C and 25°C after the puncture force was reduced to between 0.3 and 0.4 newtons. Application of gibberellic acid 4+7 (100 microliters per liter) resulted in earlier germination at 15°C and 25°C and decreased endosperm strength sooner than in untreated seeds. Similarly, high O 2 concentrations had similar effects on germination earliness and endosperm strength decline as did gibberellic acid 4+7 , but only at 25°C. At 15°C, high O 2 concentrations slowed germination and endosperm strength decline.
105 citations