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  • Plant growth substances (PGS) have innumerable practical application. Name the PGS you should use to (a) Increase yield of sugarcane (b) Promote lateral shoot growth (c) Cause sprouting of potato tuber (d) Inhibit Seed germination

Plant growth substances (PGS) have innumerable practical application. Name the PGS you should use to

(a) Increase yield of sugarcane
(b) Promote lateral shoot growth
(c) Cause sprouting of potato tuber
(d) Inhibit Seed germination

Answers (1)

Ans.
(a) Gibberellic acid: Gibberellin can significantly enhance sugarcane yield. It promotes the storage of carbohydrates as sugar in the stems of sugarcane. When sprayed on sugarcane, gibberellin increases the length of the stems and can boost the yield by as much as 20 tonnes per acre. This also leads to a higher sugar content in the harvested crop.

(b) Cytokinin: Promotes lateral shoot growth.Cytokinins promote lateral growth. They also help in adventitious shoot formation. This helps to overcome apical dominance.

(c) Ethylene: Ethylene is a gaseous phytohormone that promotes the sprouting of potato tubers. It helps break seed dormancy and initiates germination.

(d) Abscisic acid (ABA): Inhibits seed germination.Abscisic acid, also called the stress hormone, acts as a plant growth inhibitor. It is an inhibitor of plant metabolism and promotes seed dormancy, closure of stomata at the time of stress. Seed germination is prevented due to the action of ABA that helps overcome the unfavorable weather conditions.

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