Elevated CO₂ Increases Nitrogen Fixation at the Reproductive Phase Contributing to Various Yield Responses of Soybean Cultivars.

ABSTRACT: Nitrogen deficiency limits crop performance under elevated CO₂ (eCO₂), depending on the ability of plant N uptake. However, the dynamics and redistribution of N₂ fixation, and fertilizer and soil N use in legumes under eCO₂ 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 (aCO₂) or 550 ppm CO₂ (eCO₂). The plants were supplied with 100 mg N kg^-1 soil as ¹⁵N-labeled calcium nitrate, and

SUBMITTER: Li Y 

PROVIDER: S-EPMC5603704 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature