BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Ethylene is regarded as a multifunctional phytohormone that regulates both growth, and senescence. It promotes or inhibits growth and senescence processes depending on its concentration, timing of application, and the plant species.

Detailed explanation-2: -Abscisic acid is a plant growth inhibitor.

Detailed explanation-3: -Growth Hormones. Auxins and cytokinins are major growth promoters and morphogens (Table 3-7, Fig. 3-12). Auxin, or indoleacetic acid, is synthesized in young leaves and in developing seeds from the amino acid tryptophan.

Detailed explanation-4: -The gaseous plant hormone ethylene modulates many internal processes and growth responses to environmental stimuli. Ethylene has long been recognized as a growth inhibitor, but evidence is accumulating that ethylene can also promote growth.