Name various plant hormones. Also gives their physiological effects on plant growth and development?
Answers
Auxin
Cytokinin
Gibberlins
Absesic acid
Plants also perform chemical coordinatiòn for various activities with the help of hormones. These are the chemical compounds released by stimulated cells that diffuse to various locations in plants performing different functions. These hormones produced by plants are also called as phytohormones.
Different types of hormones produced by plants are: Auxin, Gibberellins, Cytokinins, Abscisic acid Ethylene
Auxin
▪Synthesised in the young tip of roots and shoots. diffuses towards the shady side of plant, which stimulates the cells to grow longer, resulting in bending of shoot towards light.
▪Promotes cell elongation and division.
▪Plays important role in formation of roots and seedless fruits.
Giberellins
▪Helps in growth of stem and flower.
▪Helps in germination of seed
Cytokinins
▪Promote cell divsion and delay leaf aging.
▪Also stimulate leaf expansion
Abscisic acid
▪Growth inhibitor
▪Reverses the growth promoting effects of auxins and gibberellins.
Ethylene
▪Promotes transverse growth.
▪Essential for fruit ripening, promotes senescence and abscission of leaves.