a) Ethylene (CH 2 =CH 2 ):
- Ethylene exerts a variety of effects on plants, viz., chlorosis, leaf abscission, epinasty, stimulation of adventitious roots, fruit ripening and increased permeability of cell membranes.
- Ex: Ethylene is involved in premature ripening of fingers in banana infected by Pseudomonas solanacearum, the causal agent of moko disease of banana.
b) Abscissic acid:
- It exerts dormancy in seeds, closure of stomata, inhibition of seed germination and growth and stimulated germination of fungal spores.
c) Dormin / Abscissin II:
- Dormin induces dormancy by converting developing leaf primordia of a bud into bud scales .
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