Effects of elevated O3 exposure on seed yield, N concentration and photosynthesis of nine soybean cultivars (Glycine max (L.) Merr.) in Northeast China.
Effects of elevated O3 exposure on seed yield, N concentration and photosynthesis of nine soybean cultivars (Glycine max (L.) Merr.) in Northeast China.
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DOI：
10.1016/j.plantsci.2014.04.020
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发表时间：
2014-09
期刊：
影响因子：
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通讯作者：
Weiwei Zhang;Guanghua Wang;Xiaobing Liu;Zhaozhong Feng
中科院分区：
文献类型：
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作者：
Weiwei Zhang;Guanghua Wang;Xiaobing Liu;Zhaozhong Feng
Nine soybean cultivars widely cultivated in Northeast China were investigated in present study to assess their O3sensitivities on the basis of the response of photosynthesis and seed yield to ambient and future ozone (O3) concentrations, and determine whether the effects of O3vary with the developmental stages (flowering and seed filling stages). Relative to charcoal-filtered air (CF), elevated O3concentration (E-O3, ambient air + 40 ppb) significantly reduced soybean yields by 40%, with a range of 32–46% among cultivars. E-O3also induced significant decreases in pigment contents, net photosynthetic rate and chlorophyllafluorescence at both flowering and seed filling stages in most cultivars. Except net photosynthetic rate and stomatal conductance (gs) at seed filling stage, all variables showed no significant interaction between O3and cultivar, suggesting that all tested cultivars had similar sensitivities to O3. The responses of seed N content to E-O3differed among cultivars. Ambient O3concentration (mean of daily concentration of 19 ppb) did not induce any change relative to CF. Significant positive relationship between endogenousgsin CF and yield loss among cultivars was found only at seed filling stage. Positive correlation between effects of E-O3on leaf N content and effects on light saturated photosynthetic rate (Asat) indicated thatgsand leaf N content at seed filling stage contributes to yield loss and decreased photosynthesis by E-O3, respectively. It can be inferred that E-O3had a larger negative effects on seed filling stage than flowering stage of soybean.
