Photosynthetica 2017, 55(4):611-622 | DOI: 10.1007/s11099-017-0673-8

Photosynthetic and antioxidative upregulation in drought-stressed sesame (Sesamum indicum L.) subjected to foliar-applied salicylic acid

M. Yousefzadeh Najafabadi1, P. Ehsanzadeh1,*
1 Department of Agronomy and Plant Breeding, College of Agriculture, Isfahan University of Technology, Isfahan, Iran

Insufficient attention has been paid to the physiological responses of sesame to drought and it is unclear if exogenous plant growth regulators are beneficial to drought-stressed sesame. Thus, a field study was conducted on seven Sesamum indicum genotypes affected by two levels of irrigation (60 and 80% depletions in available soil water) and by foliar-applied salicylic acid (SA; 0 and 0.6 mM). Water deficit led to depressions in net photosynthetic rate, stomatal conductance, leaf area index, chlorophyll a, b, and total chlorophyll contents, maximum quantum efficiency of PSII, and plant dry matter and seed yield, despite increases in carotenoid concentration, superoxide dismutase, catalase, peroxidase, and ascorbate peroxidase activities. SA was found beneficial in ameliorating the depressions in all of the above characteristics, indicating that it could be applied for lessening the harmful effects of the drought stress.

Additional key words: antioxidant enzyme; gas exchange; oilseed; plant growth regulation

Received: June 12, 2016; Accepted: September 20, 2016; Published: December 1, 2017  Show citation

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Yousefzadeh Najafabadi, M., & Ehsanzadeh, P. (2017). Photosynthetic and antioxidative upregulation in drought-stressed sesame (Sesamum indicum L.) subjected to foliar-applied salicylic acid. Photosynthetica, 55(4), 611-622. doi: 10.1007/s11099-017-0673-8
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