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2015, DOI: 10.1111/pce.12674

Factors underlying genotypic differences in the induction of photosynthesis in soybean [Glycine max (L.) Merr.]

Plant, Cell & Environment

Mochamad Arief Soleh, Yu Tanaka, Yuko Nomoto, Yu Iwahashi, Keiichiro Nakashima, Yasuko Fukuda, Stephen P. Long, and Tatsuhiko Shiraiwa


Crop leaves are subject to continually changing light levels in the field. Photosynthetic efficiency of a crop canopy and productivity will depend significantly on how quickly a leaf can acclimate to a change. One measure of speed of response is the rate of photosynthesis increase toward its steady-state on transition from low to high light. This rate was measured for seven genotypes of soybean [Glycine max (L.) Merr.]. After 10 min of illumination, cultivar ‘UA4805’ (UA) had achieved a leaf photosynthetic rate (Pn) of 23.2 µmol·m−2·s−1, close to its steady-state rate, while the slowest cultivar ‘Tachinagaha’ (Tc) had only reached 13.0 µmol·m−2·s−1 and was still many minutes from obtaining steady-state. This difference was further investigated by examining induction at a range of carbon dioxide concentrations. Applying a biochemical model of limitations to photosynthesis to the responses of Pn to intercellular CO2 concentration (Ci), it was found that the speed of apparent in vivo activation of Ribulose-1:5-bisphosphate carboxylase/oxygenase (Rubisco) was responsible for this difference. Sequence analysis of the Rubisco activase gene revealed single nucleotide polymorphisms that could relate to this difference. The results show a potential route for selection of cultivars with increased photosynthetic efficiency in fluctuating light. This article is protected by copyright. All rights reserved.

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The LongLab is supported by many public and private partnerships, including the Bill & Melinda Gates Foundation, the Foundation for Food and Agriculture Research, the UK Government's Department for International Development, the U.S. Department of Energy, and the Advanced Research Projects Agency-Energy.

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