Quantum Yields of Photosystem II and Photosynthesis in and Aurea Mutant of Tobacco (C_3) and an Oil Yellow Mutant of Maize (C_4) Which Have High Capacities for Photosynthesis Despite Low Chlorophyll Contents
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概要
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The quantum yields of O_2 evolution (φ_<O_2>), CO_2 fixation (φ_<CO_2>), and of photosystem II measured by fluorescence analysis (φ_<PSII>),were determined in a mutant of tobacco (C_3) and a mutant of maize (C_4) having large deficiencies in light harvesting chlorophyll, but having similar capacities for photosynthesis on a leaf area basis as the wild-type plants. The heterozygous dominant mutant of tobacco (aurea, Su/+) having 30% chlorophyll content of the wild-type, and of maize (oil yellow, Oy/+) having 60% chlorophyll content of the wild-type, maintain high leaf absorptances. The maximum φ_<O_2>, on an absorptance basis, measured under limiting red light and saturating CO_2 were the same in the mutant versus wild-type plants. φ_<PSII> and φ_<CO_2>, decreased in a similar manner with increasing light intensity, while the ratio of φ_<PSII>/φ_<CO_2> under varying light remained reasonably constant, in mutant versus wild-type seedlings. The results indicate that these C_3 and C_4 mutants which have high capacities for photosynthesis despite large deficiencies in chlorophyll content, maintain a high leaf absorptance, and a balanced utilization of absorbed quanta in photochemistry.
- 日本植物生理学会の論文
著者
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Lal A
Washington State Univ. Wa Usa
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EDWARDS G.E.
Botany Department, Washington State University
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JOHNSON E.
Botany Department, Washington State University
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LAL A.
Botany Department, Washington State University
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KRALL J.P.
Botany Department, Washington State University
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Krall J.p.
Botany Department Washington State University
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Edwards G.e.
Botany Department Washington State University