Antenna Sizes of Photosystem I and Photosystem II in Chlorophyll b-Deficient Mutants of Rice. Evidence for an Antenna Function of Photosystem II Centers That are Inactive in Electron Transport
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概要
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Light-harvesting capacities of photosystem I (PSI) and photosystem II (PSII) in a wild-type and three chlorophyll b-deficient mutant strains of rice were determined by measuring the initial slope of light-response curve of PSI and PSII electron transport and kinetics of light-induced redox changes of P-700 and Q_A, respectively. The light-harvesting capacity of PSI determined by the two methods was only moderately reduced by chlorophyll b-deficiency. Analysis of the fluorescence induction that monitors time course of Q_A Photoreduction showed that both relative abundance and antenna size of PSII_a decrease with increasing deficiency of chlorophyll b and there is only PSII_β in chlorina 2 which totally lacks chlorophyll b. The numbers of antenna chlorophyll molecules associated with the mutant PSII centers were, therefore, three to five times smaller than that of PSII_a in the wild type rice. Rates of PSII electron transport determined on the basis of PSII centers in the three mutants were 60-70% of that in the normal plant at all photon flux densities examined, indicating that substantial portions of the mutant PSII centers are inactive in electron transport. The initial slopes of light-response curves of PSII electron transport revealed that the functional antenna sizes of the active populations of PSII centers in the mutants correspond to about half that of PSII_a in the wild type rice. Thus, the numbers of chlorophyll molecules that serve as antenna of the oxygen-evolving PSII centers in the mutants are significantly larger than those that are actually associated with each PSII center. It is proposed that the in-active PSII serves as an antenna of the active PSII in the three chlorophyll b-deficient mutants of rice. In spite of the reduced antenna size of PSII, therefore, the total light-har-vesting capacity of PSII approximately matches that of PSI in the mutants.
- 日本植物生理学会の論文
著者
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Terao Tomio
Biological Resources Division Japan International Research Center For Agricultural Sciences
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Katoh Sakae
Department Of Biology Faculty Of Science Toho University
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Katoh Sakae
Department Of Biochemistry Faculty Of Science University Of Tokyo
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