High photosynthetic efficiency of a rice (Oryza sativa L.) xantha mutant |
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| Authors: | Xiang-sheng Zhou Dian-xing Wu Sheng-quan Shen Jun-wei Sun Qing-yao Shu |
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| Institution: | (1) National Key Laboratory of Rice Biology and Ministerial Key Laboratory for Nuclear Agricultural Sciences, Institute of Nuclear Agricultural Sciences, Zhejiang University, Hangzhou, 310029, China;(2) College of Life Sciences, Zhejiang University, Hangzhou, 310029, China;(3) Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, International Atomic Energy Agency, Wagramer Straase 5, P.O. Box 100, A-1400 Vienna, Austria;(4) Present address: College of Life Sciences, China Institute of Metrology, Hangzhou, 310018, China |
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| Abstract: | Comparative analysis revealed that a xantha rice mutant (cv. Huangyu B) had higher ratios of chlorophyll (Chl) a/b and carotenoids/Chl, and higher photosynthetic efficiency than its wild type parent (cv. II32 B). Unexpectedly, the mutant
had higher net photosynthetic rate (P
N) than II32 B. This might have resulted from its lower non-photochemical quenching (qN) but higher maximal photochemical efficiency (FV/FM), higher excitation energy capture efficiency of photosystem 2 (PS2) reaction centres (FV′/FM′), higher photochemical quenching (qP), higher effective PS2 quantum yield (ΦPS2), and higher non-cyclic electron transport rate (ETR). This is the first report of a chlorophyll mutant that has higher photosynthetic
efficiency and main Chl fluorescence parameters than its wild type. This mutant could become a unique material both for the
basic research on photosynthesis and for the development of high yielding rice cultivars. |
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| Keywords: | chlorophyll b-deficiency chlorophyll fluorescence net photosynthetic rate Oryza sativa photosynthetic efficiency xantha mutation |
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