Elevated CO2 Increases Nitrogen Fixationat the Reproductive Phase Contributing to Various Yield Responses of Soybean Cultivars

文献类型： 外文期刊

第一作者： Li, Yansheng

作者： Li, Yansheng;Yu, Zhenhua;Liu, Xiaobing;Wang, Guanghua;Liu, Judong;Zhang, Shaoqing;Jin, Jian;Mathesius, Ulrike;Tang, Caixian;Jin, Jian;Wu, Junjiang

作者机构：

关键词： open-top chamber;N-15 labeling;nodule density;symbiotic N-2 fixation;N remobilization;Glycine max L

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.753； 五年影响因子：6.612 ）

ISSN： 1664-462X

年卷期： 2017 年 8 卷

页码：

收录情况： SCI

摘要： Nitrogen deficiency limits crop performance under elevated CO2 (eCO(2)), depending on the ability of plant N uptake. However, the dynamics and redistribution of N-2 fixation, and fertilizer and soil N use in legumes under eCO(2) have been little studied. Such an investigation is essential to improve the adaptability of legumes to climate change. We took advantage of genotype-specific responses of soybean to increased CO2 to test which N-uptake phenotypes are most strongly related to enhanced yield. Eight soybean cultivars were grown in open-top chambers with either 390 ppm (aCO(2)) or 550 ppm CO2 (eCO(2)). The plants were supplied with 100 mg N kg(-1) soil as N-15-labeled calcium nitrate, and harvested at the initial seed-filling (R5) and full-mature (R8) stages. Increased yield in response to eCO(2) correlated highly (r = 0.95) with an increase in symbiotically fixed N during the R5 to R8 stage. In contrast, eCO(2) only led to small increases in the uptake of fertilizer-derived and soil-derived N during R5 to R8, and these increases did not correlate with enhanced yield. Elevated CO2 also decreased the proportion of seed N redistributed from shoot to seeds, and this decrease strongly correlated with increased yield. Moreover, the total N uptake was associated with increases in fixed-N per nodule in response to eCO(2), but not with changes in nodule biomass, nodule density, or root length.

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