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Journal of Integrative Agriculture  2015, Vol. 14 Issue (5): 977-983    DOI: 10.1016/S2095-3119(14)60941-2
Soil & Fertilization﹒Irrigation﹒Plant Nutrition﹒ Agro-Ecology & Environment Advanced Online Publication | Current Issue | Archive | Adv Search |
Leaf photosynthesis and yield components of mung bean under fully open-air elevated [CO2]
 GAO Ji, HAN Xue, Saman Seneweera, LI Ping, ZONG Yu-zheng, DONG Qi, LIN Er-da, HAO Xing-yu
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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摘要  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].

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].
Keywords:  free air carbon dioxide enrichment (FACE)       photosynthetic pigment       photosynthesis       chlorophyll fluorescence       yield       mung bean  
Received: 22 September 2014   Accepted:
Fund: 

This work was supported by the National Key Technologies R&D Program during the 12th Five-Year Plan of China (2013BAD11B03-8), the National Basic Research Program of China (973 Program, 2012 CB955904), the Natural Science Foundation of Shanxi Province, China (2013011039-3), the Agricultural Science and Technology Innovation Program of CAAS, the Earmarked Fund for Modern Agro- Industry Technology Research System, China (CARS-3-1- 24) and Shanxi Agricultural University Doctoral Scientific Research Fund, China.

Corresponding Authors:  LIN Er-da, E-mail: linedster@gmail.com;HAO Xing-yu, E-mail: haoxingyu1976@126.com   
About author:  These authors contributed equally to this study.

Cite this article: 

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