Biologia plantarum 46:535-540, 2003 | DOI: 10.1023/B:BIOP.0000041058.65442.41
Physiological Effects of Plant Hormones in Cotton Under Drought
- 1 Department of Botany and Plant Physiology, Chaudhary Charan Singh, Haryana Agriculture University, Hisar-, India
Effects of plant hormones indole-3-yl-acetic acid (IAA), gibberellic acid (GA), benzylaminopurine (BAP), abscisic acid (ABA) and ethrel (ETH) in 5 μM concentration on gas exchange, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO, EC 4.1.1.39) activity, pigment content and yield in cotton (Gossypium hirsutum L. 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), transpiration rate (E), carboxylation efficiency (CE), water use efficiency (WUE), 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.
Keywords: abscisic acid; benzylaminopurine; chlorophyll; ethrel; gas exchange; gibberellic acid; Gossypium hirsutum; indole-3-yl-acetic acid; ribulose-1,5-bisphosphate carboxylase, oxygenase; water use efficiency; yield
Subjects: abscisic acid (ABA); auxins; carboxylation efficiency, drought, plant hormones; carotenoids, drought, plant hormones; chlorophyll, drought, plant hormones; cotton, drought, plant hormones; cytokinins; flowering, drought, plant hormones; gas exchange, drought, plant hormones; gibberellins; Gossypium hirsutum; stomatal conductance, drought, plant hormones; water stress, gas exchange; water use efficiency, drought, plant hormones
Published: December 1, 2003 Show citation
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