Photosynthetica 2020, 58(5):1200-1209 | DOI: 10.32615/ps.2020.067

Effect of simultaneous shade and drought stress on morphology, leaf gas exchange, and yield parameters of different soybean cultivars

I. SHAFIQ1,2, S. HUSSAIN1,2, B. HASSAN3, M. SHOAIB5, M. MUMTAZ1, B. WANG1,2, A. RAZA1,2, A. MANAF6, M. ANSAR6, W. YANG1,2, F. YANG1,2
1 College of Agronomy, Sichuan Agricultural University, 211-Huimin Road, Wenjiang District, 611130 Chengdu, China
2 Sichuan Engineering Research Centre for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture), Sichuan Agricultural University, Chengdu, China
3 Rice Research Institute and Key Laboratory for Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, China
5 College of Resources, Sichuan Agricultural University, 611130 Chengdu, China
6 Department of Agronomy, Pir Mehr Ali Shah Arid Agriculture University, Rawalpindi, Punjab, Pakistan

An interactive effect of simultaneous shade and drought stress on drought-tolerant and drought-sensitive cultivars of soybean was studied. As drought stress intensified, the net photosynthetic rate decreased in both cultivars due to reduced leaf area, relative water content, transpiration rate, stomatal conductance, chlorophyll content, and Rubisco activity which ultimately led to yield reduction. Moreover, the chlorophyll fluorescence parameters also decreased. Interestingly, a moderate shade was found helpful in alleviating the adverse effects of drought stress, specifically in resistant cultivar N12 where seed yield improved significantly under moderate drought conditions in contrast to the cultivar C103. In summary, the effect of drought stress on soybean depended on the irradiance conditions and shade could enhance soybean drought resistance, although this resistance was cultivar dependent. With appropriate cultivar selection, a moderate shade can help optimize yield and improve the performance of drought-exposed soybean.

Additional key words: drought; intercropping; morphology; photosynthesis; shade; stress.

Received: June 15, 2020; Revised: September 4, 2020; Accepted: September 22, 2020; Prepublished online: October 26, 2020; Published: December 8, 2020  Show citation

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SHAFIQ, I., HUSSAIN, S., HASSAN, B., SHOAIB, M., MUMTAZ, M., WANG, B., ... YANG, F. (2020). Effect of simultaneous shade and drought stress on morphology, leaf gas exchange, and yield parameters of different soybean cultivars. Photosynthetica, 58(5), 1200-1209. doi: 10.32615/ps.2020.067
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