Photosynthesis and yield response to elevated CO2, C4 plant foxtail millet behaves similarly to C3 species

Li, Ping and Li, Bingyan and Seneweera, Saman and Zong, Yuzheng and Li, Frank Yonghong and Han, Yuanhuai and Hao, Xingyu (2019) Photosynthesis and yield response to elevated CO2, C4 plant foxtail millet behaves similarly to C3 species. Plant Science, 285. pp. 239-247. ISSN 0168-9452

Abstract

Foxtail millet (Setaria italica) is a nutrient-rich food source traditionally grown in arid and semi-arid areas, as it is well adapted to drought climate. Yet there is limited information as how the crop responses to the changing climate. In order to investigate the response of foxtail millet to elevated [CO2] and the underlying mechanism, the crop was grown at ambient [CO2] (400 μmol mol−1) and elevated [CO2] (600 μmol mol−1) in an open-top chamber (OTC) experimental facility in North China. The changes in leaf photosynthesis, chlorophyll fluorescence, biomass, yield and global gene expression in response to elevated [CO2] were determined. Despite foxtail millet being a C4 photosynthetic crop, photosynthetic rates (PN) and intrinsic water-use efficiency (WUEi), were increased under elevated [CO2]. Similarly, grain yield and above-ground biomass also significantly increased (P <  0.05) for the two years of experimentation under elevated [CO2]. Increases in seeds and tiller number, spike and stem weight were the main contributors to the increased grain yield and biomass. Using transcriptomic analyses, this study further identified some genes which play a role in cell wall reinforcement, shoot initiation, stomatal conductance, carbon fixation, glycolysis / gluconeogenesis responsive to elevated [CO2]. Changes in these genes reduced plant height, increased stem diameters, and promote CO2 fixation. Higher photosynthetic rates at elevated [CO2] demonstrated that foxtail millet was not photosynthetically saturated at elevated [CO2] and its photosynthesis response to elevated [CO2] were analogous to C3 plants.


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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 (24 Mar 2014 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Date Deposited: 06 Sep 2019 01:33
Last Modified: 10 Sep 2019 05:21
Uncontrolled Keywords: elevated [CO2], foxtail millet, photosynthesis, yield, gene expression
Fields of Research : 05 Environmental Sciences > 0502 Environmental Science and Management > 050299 Environmental Science and Management not elsewhere classified
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070399 Crop and Pasture Production not elsewhere classified
Identification Number or DOI: 10.1016/j.plantsci.2019.05.006
URI: http://eprints.usq.edu.au/id/eprint/36986

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