Leaf photosynthesis and yield components of mung bean under fully open-air elevated[CO_2] |
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| Authors: | GAO Ji HAN Xue Saman Seneweera LI Ping ZONG Yu-zheng DONG Qi LIN Er-da HAO Xing-yu |
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| Institution: | 1、Key Laboratory of Ministry of Agriculture on Agro-Environment and Climate Change, Institute of Environment and Sustainable
Development in Agriculture (IEDA), Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
2、College of Agriculture, Shanxi Agricultural University, Taigu 030801, P.R.China
3、Centre for Systems Biology, University of Southern Queensland, Toowoomba 4350, Australia |
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| Abstract: | Mung bean (Vigna radiata L.) has the potential to establish symbiosis with rhizobia, and symbiotic association of soil micro flora may facilitate the photosynthesis and plant growth response to elevated CO2]. Mung bean was grown at either ambient CO2 400 μmol mol–1 or CO2] ((550±17) μmol mol–1) under free air carbon dioxide enrichment (FACE) experimental facility in North China. Elevated CO2] increased net photosynthetic rate (Pn), water use efficiency (WUE) and the non-photochemical quenching (NPQ) of upper most fully-expanded leaves, but decreased stomatal conductance (Gs), intrinsic efficiency of PSII (Fv´/Fm´), quantum yield of PSII (ΦPSII) and proportion of open PSII reaction centers (qP). At elevated CO2], the decrease of Fv´/Fm´, ΦPSII, qP at the bloom stage were smaller than that at the pod stage. On the other hand, Pn was increased at elevated CO2] by 18.7 and 7.4% at full bloom (R2) and pod maturity stages (R4), respectively. From these findings, we concluded that as a legume despite greater nutrient supply to the carbon assimilation at elevated CO2], photosynthetic capacity of mung bean was still suppressed under elevated CO2] particularly at pod maturity stage but plant biomass and yield was increased by 11.6 and 14.2%, respectively. Further, these findings suggest that even under higher nutrient acquisition systems such as legumes, nutrient assimilation does not match carbon assimilation under elevated CO2] and leads photosynthesis down-regulation to elevated CO2]. |
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| Keywords: | free air carbon dioxide enrichment (FACE) photosynthetic pigment photosynthesis chlorophyll fluorescence yield mung bean |
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