what are plant Harmone ?list the function of the following a) cytokimin b)abscesic acid
Answers
There are five major plant hormones which are Auxin, Cytokinin, Gibberellin, Ethylene and Abscisic acid. Functions of these hormones are as follows:
1. Auxin
Auxin induces cell elongation, maintains apical dominance, initiates root formation, prevent abscission, induces parthenocarpy and is used as herbicide also in synthetic forms.
2. Cytokinin
Cytokinin promotes cell division and organ formation, delays senescence, promotes lateral bud development, enhances cell expansion in cotyledons leaves, promotes Chloroplast development and Chlorophyll synthesis.
3. Gibberellin
Gibberellin promotes stem elongation, seed germination, breaks dormancy, causes elongation of internodes and induces parthenocarpy.
4. Ethylene
Ethylene promotes fruit ripening.
5. Abscisic acid (ABA)
ABA induces stomatal closure, provides stress against salt stress, induces dormancy, causes abscission.
Answer:
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Explanation:
Plant hormones are signal molecules, produced within plants, that occur in extremely low concentrations. Plant hormones control all aspects of plant growth and development, from embryogenesis, the regulation of organ size, pathogen defense, stress tolerance and through to reproductive development.
a) cytokimin
Cytokinins (CK) are a class of plant growth substances (phytohormones) that promote cell division, or cytokinesis, in plant roots and shoots. They are involved primarily in cell growth and differentiation, but also affect apical dominance, axillary bud growth, and leaf senescence.
b)abscesic acid
Abscisic acid (ABA) is a plant hormone. ABA functions in many plant developmental processes, including seed and bud dormancy, the control of organ size and stomatal closure. It is especially important for plants in the response to environmental stresses, including drought, soil salinity, cold tolerance, freezing tolerance, heat stress and heavy metal ion tolerance.
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