title: Factors underlying genotypic differences in the induction of photosynthesis in soybean [Glycine max (L.) Merr].
abstract: 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.
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan.|Faculty of Agriculture, Padjadjaran University, Jalan Raya Bandung-Sumedang km 21, Jatinangor, 45363, Indonesia.
authors.forename: Mochamad Arief
authors.initials: MA
authors.lastname: Soleh
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan.|The Institute for Genomic Biology, University of Illinois, Urbana-Champaign, 1206 west Gregory Drive, Urbana, IL, 61801, USA.
authors.forename: Yu
authors.initials: Y
authors.lastname: Tanaka
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Nomoto
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan.|The Institute for Genomic Biology, University of Illinois, Urbana-Champaign, 1206 west Gregory Drive, Urbana, IL, 61801, USA.
authors.forename: Yu
authors.initials: Y
authors.lastname: Iwahashi
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan.
authors.forename: Keiichiro
authors.initials: K
authors.lastname: Nakashima
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan.
authors.forename: Yasuko
authors.initials: Y
authors.lastname: Fukuda
authors.affiliation: The Institute for Genomic Biology, University of Illinois, Urbana-Champaign, 1206 west Gregory Drive, Urbana, IL, 61801, USA.
authors.forename: Stephen P
authors.initials: SP
authors.lastname: Long
authors.affiliation: Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan.
authors.forename: Tatsuhiko
authors.initials: T
authors.lastname: Shiraiwa
mesh_terms: D004579:Electron Transport / Q000528:radiation effects; D005838:Genotype; D008027:Light; D010788:Photosynthesis / Q000235:genetics* / Q000528:radiation effects; D013025:Glycine max / Q000235:genetics* / Q000502:physiology* / Q000528:radiation effects; D013997:Time Factors
keywords: light intensity; non-steady-state photosynthesis; photosynthetic capacity; photosynthetic induction response; stomatal dynamics