Write the few application of gibberellins
Answers
Answer:
Gibberellins are endogenous plant growth regulators and were originally discovered as the phytotoxic metabolites of a rice pathogen, Gibberella fugikuroi. There are more than 100 gibberellins reported from widely different organism such as fungi and higher plants. They are denoted as G1, G2, and G3 and so on. They are acidic in nature. They are producing a wide range of physiological response in plants.
Their ability to cause an increase in length of axil is used to increase the length of grapes stalks. Gibberellins cause fruits like apple to elongate and improve its shape. They also delay the senescence. G3 is used to speed up the malting process in brewing industry.
Applications of Gibberellins:
1. Elongation of genetically dwarf plants:
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In higher plant is to stimulate the elongation of inter-nodal cells. Dwart and miniature varieties of plants are often genetic mutants, which do not produce gibberellins. They can be made to grow to normal size by application of gibberellins.
2. Bolting and flowering in long-day plants:
They controlling a balance between internodes growth and leaf development.
3. Substitution of cold treatment:
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Biennial plants flower only when they receive low temperature during winter season. Such plants would, however, flower after gibberellins treatment even if they do not receive suitable low temperature. Thus biennial plants can be made to flower in a single year by gibberellins treatment.
4. Breaking of dormancy:
They can effectively break the dormancy of potato tubers and winter buds of many trees. They also act as an antagonist to abscisic acid.
5. Parthenocarpy:
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They are more effective than auxins in inducing parthenocarpy.
6. The hormone tried with leaf and root culture of digitalis, showed higher production of digoxin.
7. Spraying juvenile conifers with gibberellins hastens the maturity period, the leading to early seed production
8. Spraying sugarcane crop with gibberellins increase the length of the stem.
Answer:
gibberellins is a plant hormone which helps in germination , development and increase in size of fruits