Leaf photosynthesis and yield components of mung bean under fully open-air elevated [CO2]

Gao, Ji and Han, Xue and Seneweera, Saman and Li, Ping and Zong, Yu-zheng and Dong, Qi and Lin, Er-da and Hao, Xing-yu (2015) Leaf photosynthesis and yield components of mung bean under fully open-air elevated [CO2]. Journal of Integrative Agriculture, 14 (5). pp. 977-983. ISSN 2095-3119


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 atelevated [CO2] by 18.7 and 7.4% at full bloom (R2) and pod maturity stages (R4), respectively. From these findings, weconcluded that as a legume despite greater nutrient supply to the carbon assimilation at elevated [CO2], photosyntheticcapacity 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] andleads photosynthesis down-regulation to elevated [CO2].

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health
Date Deposited: 03 Jun 2016 04:57
Last Modified: 28 Feb 2019 04:00
Uncontrolled Keywords: free air carbon dioxide enrichment (FACE); photosynthetic pigment; photosynthesis; chlorophyll fluorescence; yield; mung bean
Fields of Research : 05 Environmental Sciences > 0501 Ecological Applications > 050102 Ecosystem Function
05 Environmental Sciences > 0501 Ecological Applications > 050101 Ecological Impacts of Climate Change
Identification Number or DOI: 10.1016/S2095-3119(14)60941-2
URI: http://eprints.usq.edu.au/id/eprint/28439

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