Mechanism of High Photosynthetic Capacity in BC_2F_4 Lines Derived from a Cross between Oryza sativa and Wild Relatives O. rufipogon(Crop Physiology and Ecology)

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概要

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• We found that several BC_2F_4 lines had high leaf photosynthetic rates under light-saturated and ambient CO_2 conditions. These lines are progenies of BC_2F_1 plants with high photosynthetic capacities which were generated by backcrossing between Oryza rufipogon (W630) and O. sativa cv. Nipponbare, as a recurrent parent. Some photosynthetic characteristics of the BC_2F_4 lines were investigated to identify the factors increasing photosynthetic rates. Photosynthetic rates of these lines under light-saturated conditions at 50 to 700ppm CO_2 concentrations were higher than those in Nipponbare. The estimated-maximum photosynthetic rates under light-saturated and CO_2-saturated conditions in BC_2F_4 lines were also higher than that in Nipponbare. The photosynthetic rate under light-saturated and ambient CO_2 conditions was positively correlated with the carboxylation efficiency as an indicator of ribulose-1, 5-bisphosphate carboxylase/oxygenase (Rubisco) activity in vivo rather than stomatal conductance. Initial and total Rubisco activities in vitro tended to be higher in the BC_2F_4 lines than in Nipponbare. The content of active Rubisco calculated from the activation state of Rubisco was also higher in the BC_2F_4 lines than in Nipponbare. These results suggest that high photosynthetic capacities of BC_2F_1 plants can be maintained high in their progenies and high photosynthetic rates under light-saturated and ambient CO_2 conditions in the BC_2F_4 lines are achieved mainly by the high activity of Rubisco due to the high active Rubisco content.

著者

• Uchida Naotsugu

  Faculty of Agriculture, Kobe University

• Uchida Naotsugu

  Faculty Of Agriculture Kobe University

• ISHII Takashige

  Faculty of Agriculture, Kobe University

• Hatanaka Tomoko

  Faculty Of Agriculture Kobe University

• Hatanaka Tomoko

  Graduate School Of Agricultural Science Kobe University

• Masumoto Chisato

  Graduate School Of Science And Technology Kobe University

• Ishii Takashige

  Faculty Of Agriculture Kobe University

• Hatanaka Tomoko

  Laboratory Of Crop Science Graduate School Of Agricultural Science Kobe University

関連論文

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• Non-Stomatal Inhibition Associated with Inactivation of Rubisco in Dehydrated Coffee Leaves under Unshaded and Shaded Conditions
• Mechanism of High Photosynthetic Capacity in BC_2F_4 Lines Derived from a Cross between Oryza sativa and Wild Relatives O. rufipogon(Crop Physiology and Ecology)
• Enhancement of Rice Leaf Photosynthesis by Crossing between Cultivated Rice, Oryza sativa and Wild Rice Species, Oryza rufipogon(Crop Physiology and Ecology)
• Overexpression of Rubisco Activase Decreases the Photosynthetic CO_2 Assimilation Rate by Reducing Rubisco Content in Rice Leaves

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