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《Plant Physiology Journal》 2018-12
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Responses of photosynthetic and antioxidant enzyme activities in maize leaves to drought stress

GUO Yan-Yang;LIU Jia;ZHU Ya-Li;BAI Yan-Wen;LI Hong-Jie;XUE Ji-Quan;ZHANG Ren-He;College of Agronomy, Northwest A&F University;  
Two maize cultivars including drought-tolerant 'shaandan 609' and drought-sensitive 'shaandan 902' were subjected to the different drought stress in pot experiment. Gas exchange parameters, chlorophyll fluorescence and antioxidant enzyme activity were investigated under four drought stress treatments. Significant decrease in net photosynthetic rate(Pn) and stomatal conductance(Gs) were accompanied with first decreasing then increasing intercellular CO2 concentration(Ci) in two varieties, suggesting the reduction in the Pn was associated with non-stomatal limitation under severe drought stress. Analysis of OJIP transients according to the JIP-test protocol indicated that drought stress changed the shape of the OJIP curve and resulted in emergence of K-step and the increase of J-step and I-step of fluorescence transient, which suggested that oxygen-evolving complex(OEC) and electron transport chain after QA in photosystem II(PSII) were inhibited. What's more, the specific energy fluxes for light absorption, excitation trapping and electron transport in two varieties had significantly changed under drought stress. The change extents of these parameters were smaller in drought-tolerant variety 'shaandan 609' than in drought-sensitive variety 'shaandan 902'. With the increase of drought stress, the activities of superoxide dismutase(SOD), peroxidase(POD) and catalase(CAT) increased first and then decreased and MDA content continued to increase. Under the same drought stress, 'shaandan 609' had higher antioxidant enzyme activities. Our results suggested that the drought-tolerant variety 'shaandan 609' had higher photosynthetic electron transport activity and antioxidant enzyme activities to maintain the stability of photosynthetic system which might be its major physiological base in the adaptability to drought conditions.
【Fund】: 国家重点研发计划(2017YFD0300304);; 陕西省重点研发计划重点产业链(2017ZDCXL-NY-02);; 西北农林科技大学科技成果转化项目(TGZX2017-41)~~
【CateGory Index】: S513
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