Effects of Proline and Betaine on Heat Inactivation of Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase in Crude Extracts of Rice Seedlings |
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Authors: | ML Dionisio-Sese M Shono and S Tobita |
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Institution: | (1) Okinawa Subtropical Station, Japan International Research Center for Agricultural Sciences (JIRCAS), Ishigaki, Okinawa 907, Japan |
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Abstract: | Activity of ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO) in heated crude extracts from seedlings of the rice cultivars
Hitomebore and IR28 was investigated in the presence of proline and betaine. Both solutes retarded the inactivation of the
enzyme extracted from the leaves of both cultivars at temperature-stress from 35 to 45 °C. At 50 °C, however, betaine was
effective in both cultivars. Stabilization of RuBPCO activity was independent of the added solute from 1 to 2 M concentration.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | cultivar differences Oryza sativa L |
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