Photosynthetica 2005, 43(2):277-281 | DOI: 10.1007/s11099-005-0045-7

Midday photoinhibition of two newly developed super-rice hybrids

Q. A. Wang1,2, C. M. Lu1, Q. D. Zhang1
1 Key Laboratary of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, The Chinese Academy of Sciences, Beijing, P.R. China
2 Departments of Genetics, The Alexander Silberman Life Sciences Institute, The Hebrew University of Jerusalem, Jerusalem, Israel

Super-rice hybrids are two-line hybrid rice cultivars with 15 to 20 % higher yields than the raditional three-line hybrid rice cultivars. Response of photosynthetic functions to midday photoinhibition was compared between seedlings of the traditional hybrid rice (Oryza sativa L.) Shanyou63 and two super-rice hybrids, Hua-an3 and Liangyoupeijiu. Under strong midday sunlight, in comparison with Shanyou63, the two super-rice hybrids were less photoinhibited, as indicated by the lower loss of the net photosynthetic rate (PN), the quantum yield of photosystem 2 (ΦPS2), and the maximum and effective quantum yield of PS2 photochemistry (Fv/Fm and Fv'/Fm'). They also had a much higher transpiration rate. Hence the super-rice hybrids could protect themselves against midday photoinhibition at the cost of water. The photoprotective de-epoxidized xanthophyll cycle components, antheraxanthin (A) and zeaxanthin (Z), were accumulated more in Hua-an3 and Liangyoupeijiu than in Shanyou63, but the size of xanthophyll cycle pool of the seedlings was not affected by midday photoinhibition. Compared to Shanyou63, the super-rice hybrids were better photoprotected under natural high irradiance stress and the accumulation of Z and A, not the size of the xanthophyll pool protected the rice hybrids against photoinhibition.

Additional key words: chlorophyll fluorescence; cultivar differences; net photosynthetic rate; Oryza; photosystem 2; quantum yield; transpiration rate; xanthophyll cycle

Received: May 17, 2004; Accepted: October 7, 2004; Published: June 1, 2005  Show citation

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Wang, Q.A., Lu, C.M., & Zhang, Q.D. (2005). Midday photoinhibition of two newly developed super-rice hybrids. Photosynthetica, 43(2), 277-281. doi: 10.1007/s11099-005-0045-7
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