BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Ethylene also triggers leaf and fruit abscission, flower fading and dropping, and promotes germination in some cereals and sprouting of bulbs and potatoes. Figure 30.22. 1: Date ripening: The plant hormone ethylene promotes ripening, as seen in the ripening of dates.

Detailed explanation-2: -Abscisic acid (ABA) and ethylene are the major regulators of ripening and senescence in both dry and fleshy fruits, as demonstrated by numerous ripening-defective mutants, effects of exogenous hormone application, and transcriptome analyses.

Detailed explanation-3: -CHAPTER SUMMARY. Abscisic acid is a sesquiterpene, which has important roles in seed development and maturation, in the synthesis of proteins and compatible osmolytes, which enable plants to tolerate stresses due to environmental or biotic factors, and as a general inhibitor of growth and metabolic activities.

Detailed explanation-4: -Abscisic acid is the plant hormone, which is responsible for dormancy of seeds and inhibition of seeds. It stimulates the closure of stomata, inhibit shoot growth, stimulate the storage of proteins in seeds, and so on.

Detailed explanation-5: -Ethylene (plant hormone responsible for ripening and senescence), Abscisic acid-ABA (stress hormone), and Auxin (growth hormone) all play a symphony and cause ‘Abscission-falling/separation of leaf tissue’ from the plant.