期刊
PLANT SCIENCE
卷 226, 期 -, 页码 120-130出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2014.05.001
关键词
Climate change; Kok effect; Photosynthesis; Photorespiration; Respiration; Soybean
资金
- Higher Education Commission (HEC) Government of Pakistan PhD scholarship
- NERC [NE/D01168X/1]
- ARC [DP0986823, CE140100008]
- NERC [NE/D01168X/1] Funding Source: UKRI
- Natural Environment Research Council [NE/D01168X/1] Funding Source: researchfish
Our study sought to understand how past, low atmospheric CO2 concentrations ([CO2]) impact respiration (R) of soybean (Glycine max), when compared to plants grown under current and future [CO2]s. Experiments were conducted using plants grown under 290, 400 and 700 ppm [CO2]. Leaf R was measured in both darkness (R-D) and in the light (R-L; using the Kok method), with short-term changes in measurement [CO2] and [O-2] being used to explore the relationship between light inhibition of leaf R and photorespiration. Root R, photosynthesis (A), leaf [N] and biomass allocation traits were also quantified. In contrast to the inhibitory effect of low growth [CO2] on A, growth [CO2] had no significant effect on leaf RD or root R. Irrespective of growth [CO2], RL was always lower than R-D, with light inhibiting leaf R by 17-47%. Importantly, the degree of light inhibition of leaf R was lowest in plants grown under low [CO2], with variations in RL being positively correlated with R-D and photorespiration. Irrespective of whether leaf R was measured in the light or dark, a greater proportion of the carbon fixed by leaf photosynthesis was released by leaf R in plants grown under low [CO2] than under current/future [CO2]'s. Collectively, our results highlight the differential responses of A and R to growth of plants under low to elevated atmospheric [CO2]. (C) 2014 Elsevier Ireland Ltd. All rights reserved.
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