gibberellins are naturally produced in the seed embryo of a plant.
gibberellins are naturally produced in the seed embryo of a plant.
gibberellins are naturally produced in which part of a plant?
the seed embryo
gibberellins are involved in the natural process of breaking dormancy and other aspects of germination. before the photosynthetic apparatus develops sufficiently in the early stages of germination, the stored energy reserves of starch nourish the seedling. usually in germination, the breakdown of starch to glucose in the endosperm begins shortly after the seed is exposed to water. gibberellins in the seed embryo are believed to signal starch hydrolysis through inducing the synthesis of the enzyme α-amylase in the aleurone cells. in the model for gibberellin-induced production of α-amylase, it is demonstrated that gibberellins (denoted by ga) produced in the scutellum diffuse to the aleurone cells, where they stimulate the secretion α-amylase. α-amylase then hydrolyses starch, which is abundant in many seeds, into glucose that can be used in cellular respiration to produce energy for the seed embryo. studies of this process have indicated gibberellins cause higher levels of transcription of the gene coding for the α-amylase enzyme, to stimulate the synthesis of α-amylase.
gibberellin
gibberellins are tetracyclic diterpene acids. there are two classes based on the presence of either 19 or 20 carbons. the 19-carbon gibberellins, such as gibberellic acid, have lost carbon 20 and, in place, possess a five-member lactone bridge that links carbons 4 and 10. the 19-carbon forms are, in general, the biologically active forms of gibberellins. hydroxylation also has a great effect on the biological activity of the gibberellin. in general, the most biologically active compounds are dihydroxylated gibberellins, which possess hydroxyl groups on both carbon 3 and carbon 13. gibberellic acid is a dihydroxylated gibberellin.









































section::::chemistry.:bioactive gas.
gibberellin