期刊
PLANT AND CELL PHYSIOLOGY
卷 58, 期 3, 页码 635-642出版社
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcx018
关键词
Biomass; Elevated [CO2]; Oryza sativa; Photosynthesis; RBCS; Rubisco
资金
- Japan Society for the Promotion of Science (JSPS) [KAKENHI] [P26450074, JP16H02538]
- Grants-in-Aid for Scientific Research [16H06379] Funding Source: KAKEN
Rubisco limits photosynthesis at low CO2 concentrations ([CO2]), but does not limit it at elevated [CO2]. This means that the amount of Rubisco is excessive for photosynthesis at elevated [CO2]. Therefore, we examined whether a small decrease in Rubisco content by individual suppression of the RBCS multigene family leads to increases in photosynthesis and biomass production at elevated [CO2] in rice (Oryza sativa L.). Our previous studies indicated that the individual suppression of RBCS decreased Rubisco content in rice by 10-25%. Three lines of BC2F2 progeny were selected from transgenic plants with individual suppression of OsRBCS2, 3 and 5. Rubisco content in the selected lines was 71-90% that of wild-type plants. These three transgenic lines showed lower rates of CO2 assimilation at low [CO2] ( 28 Pa) but higher rates of CO2 assimilation at elevated [CO2] ( 120 Pa). Similarly, the biomass production and relative growth rate (RGR) of the two lines were also smaller at low [CO2] but greater than that of wild-type plants at elevated [CO2]. This greater RGR was caused by the higher net assimilation rate (NAR). When the nitrogen use efficiency (NUE) for the NAR was estimated by dividing the NAR by whole-plant leaf N content, the NUE for NAR at elevated [CO2] was higher in these two lines. Thus, a small decrease in Rubisco content leads to improvements of photosynthesis and greater biomass production in rice under conditions of elevated CO2.
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