Physiological effects of plant hormones in cotton under drought
Pandey, D.M.(Haryana Agricultural Univ., Hisar (India). Dept. of Botany and Plant Physiology) | Goswami, C.L.(Haryana Agricultural Univ., Hisar (India). Dept. of Botany and Plant Physiology)E-mail:[email protected] | Kumar, B.(Haryana Agricultural Univ., Hisar (India). Dept. of Botany and Plant Physiology)
Effects of plant hormones indole-3-yl-acetic acid, gibberellic acid, benzylaminopurine (BAP), abscisic acid (ABA) and ethrel (ETH) in 5 microM concentration on gas exchange, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO) activity, pigment content and yield in cotton (Gossypium hirsutum cv. H-777) under drought were studied. At reproductive stage (55-60 d after sowing) these hormones were sprayed on shoots one day prior to stress imposition by withholding irrigation. The soil moisture of control plants was kept at field capacity. Net photosynthetic rate (Pn), stomatal conductance (gs), transpiraton rate (E), carboxylation efficiency (CE), water use efficiency, RuBPCO activity, boll number per plant, seed number per plant and lint mass per plant significantly decreased at drought while chlorophyll (Chl) b content and flower number per plant increased. ABA and ETH significantly reduced gas exchange parameters, Chl a and Chl b content. Detrimental drought effect on Pn, gs, E, CE, RuBPCO and lint mass per plant was significantly alleviated by BAP and also its effect on seed number and lint mass per plant was significantly alleviated with the ABA treatment.
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