Photosynthetica 2006, 44(2):316-319 | DOI: 10.1007/s11099-006-0025-6

High photosynthetic efficiency of a rice (Oryza sativa L.) xantha mutant

Xiang-sheng Zhou1, Dian-xing Wu1, Sheng-quan Shen1, Jun-wei Sun2, Qing-yao Shu1,*
1 National Key Laboratory of Rice Biology and Ministerial Key Laboratory for Nuclear Agricultural Sciences, Institute of Nuclear Agricultural Sciences, Zhejiang University, Hangzhou, China
2 College of Life Sciences, Zhejiang University, Hangzhou, China

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.

Additional key words: chlorophyll b-deficiency; chlorophyll fluorescence; net photosynthetic rate; Oryza sativa; photosynthetic efficiency; xantha mutation

Received: September 5, 2005; Accepted: November 10, 2005; Published: June 1, 2006  Show citation

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Zhou, X., Wu, D., Shen, S., Sun, J., & Shu, Q. (2006). High photosynthetic efficiency of a rice (Oryza sativa L.) xantha mutant. Photosynthetica, 44(2), 316-319. doi: 10.1007/s11099-006-0025-6
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