what is the effect of gibberellin on plant growth
Background Information The pattern and rate of plant growth are controlled by a group of chemicals known as hormones. Gibberellins serve a vital role in coordinating growth and development in seed development. Among the seven kinds of plant hormones, auxin and gibberellin (GA) are strong accelerators of shoot growth, but these are not always accelerators for root growth. The internodes grow so long that the plants become indistinguishable from climbing. It exists in two forms: free type and combined type.

Gibberellic acid (also called gibberellin A3, GA, and GA 3) is a hormone found in plants and fungi. One hormone, gibberellin, stimulates cell division and enlargement in normal peas. Gibberellins are growth hormones that stimulate cell elongation and cause plants to grow taller. The role of GA in determining plant stature had major impacts on agriculture in the 1960s, and the development of semi-dwarf varieties that show altered GA responses contributed to a huge increase in grain yields during the ‘green revolution’. Plants in their normal state produce large amounts of GA3. Of the various factors regulations plant growth and developmental processes intrinsic factors play a significant role. Giberelina e citocinina no crescimento da soja . The “green revolution” of farming occurred largely due to the application of gibberellic acid to crops. The plant hormone gibberellin (GA) regulates major aspects of plant growth and development. 2003 The number of plants that emerged 15 days after sowing decreased for the treatment GA 3 in seeds (Table 1). Its chemical formula is C 19 H 22 O 6.When purified, it is a white to pale-yellow solid. The stem starts to grow when it is applied in low concentration to a bush. The family of gibberellins have a similar effect to that of auxins ; they promote cell division and elongation . The active material has been isolated from Phaseolus seeds and shown to be gibberellin A,. Gibberellic acid (GA), a plant hormone stimulating plant growth and development, is a tetracyclic di-terpenoid compound. Gibberellins. Joint application of gibberellin and cytokinin tended to inhibit gibberellin effects. 19 . The same result was found by Khafagi et al. Gibberellic acid (GA) is a kind of hormone that is important for plant growth. Gibberellins and Gibberellic Acid Gibberellins are plant hormones that regulate a wide range of processes, such as flowering, growth (by stem elongation), seed germination, and fruit ripening. The root has a simple anatomy (Melaragno and Walsh 1976, Inada et al. Hydroxylation also has a great effect on the biological activity of the gibberellin.



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