The role of ethylene and abscisic acid is both positive and negative. Justify the statement.
Positive Roles of Ethylene :
Negative Role of Ethylene :
Positive Role of Abscisic acid:
Negative Role of Abscisic acid:
(a) Positive Roles of Ethylene: Ripening of fruits
– When present in low concentration, it stimulates root meristem formation and promotes the growth of lateral roots.
(b) Negative Role of Ethylene:
– Ethylene is responsible for nullifying geotropism.
(c) Positive Role of Abscisic acid:
– During stress conditions, abscisic acid concentration increases in the leaves of the plant due to which stomata close preventing water loss via transpiration.
(d) Negative Role of Abscisic acid:
– It inhibits the growth of a plant and in turn, induces dormancy of buds.