Photosynthetica 2000, 38(3):403-407 | DOI: 10.1023/A:1010925604941
Hormonal Regulation of Photosynthetic Enzymes in Cotton under Water Stress
- 1 Department of Botany and Plant Physiology, CCS HAU, Hisar, India
Activities of ribulose bisphosphate carboxylase/oxygenase (RuBPCO), phosphoenolpyruvate carboxylase (PEPC), and carbonic anhydrase (CA) were determined in leaves of cotton (Gossypium hirsutum L. cv. H-777) subjected to 8-d waterlogging (WL) at the vegetative stage, or to drought (D) at the reproductive stage, or to interaction of both stresses. The soil moisture of control plants was kept at field capacity. One day prior to stress various growth hormones (5 μM) were sprayed up to runoff. WL reduced RuBPCO and CA activities, while PEPC activity increased. Upon D, RuBPCO and PEPC activities were reduced while CA activity was increased. Imposition of both stresses increased activities of all three enzymes. Effect of stresses on enzyme activity was alleviated by benzylaminopurine (BAP), but indol-3-yl-acetic acid was more promoting under interactive stress. No CA activity with BAP was observed during interactive stress.
Additional key words: abscisic acid; benzylaminopurine; carbonic anhydrase; ethrel; gibberellic acid; Gossypium hirsutum; phosphoenolpyruvate carboxylase; ribulose-1,5-bisphosphate carboxylase, oxygenase
Prepublished online: April 1, 2000; Published: October 1, 2000 Show citation
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