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Title: Elevated CO2 Increases Nitrogen Fixationat the Reproductive Phase Contributing to Various Yield Responses of Soybean Cultivars
Author: Y. S. Li, Z. H. Yu, X. B. Liu, U. Mathesius, G. H. Wang, C. X. Tang, J. J. Wu, J. D. Liu, S. Q. Zhang and J. Jin
Corresponding Author: 金剑
Source: Frontiers in Plant Science
Issued Date: 2017
DOI: 10.3389/Fpls.2017.01546
Volume: 8
Abstract: 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.
WOS ID: WOS:000410632400001
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Content Type: 期刊论文
URI: http://ir.iga.ac.cn/handle/131322/7530
Appears in Collections:湿地与全球变化学科组_期刊论文

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