BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Dropping of buds, blooms and leaves usually happens as a means to protect plant and trees from drying out. For cut flowers and potted plants this dropping of buds, blooms and leaves is often the result of over-production of the growth hormone ethylene.

Detailed explanation-2: -Ethylene has an important role in the regulation of leaf senescence. Ethylene is one of the most important hormones in the leaf senescence regulation (Table 1). Ethylene can trigger the senescence process, especially in the sensitive species.

Detailed explanation-3: -Ethylene can trigger the senescence process, especially in the sensitive species. The ethylene biosynthesis is higher during the first stage of leaf formation and declines until it reaches maturity when the leaf is completely expanded, then it increases again during the early step of the senescence initiation.

Detailed explanation-4: -The data indicate that ethylene causes abscission in vivo by inhibiting auxin synthesis and transport or enhancing auxin destruction, thus lowering the diffusible auxin level.

Detailed explanation-5: -Ethylene production is induced by endogenous cues (auxin, cytokinin, BA) and (a)biotic stress conditions (light, temperature, drought, hypoxia, flooding, pathogens, wounding). Ethylene can also regulate its own production. As a gas, ethylene can readily diffuse from all plant tissues.