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Midday photoinhibition of two newly developed super-rice hybrids

  • Brief Communication
  • Published:
Photosynthetica

Abstract

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 (P N), 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.

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Abbreviations

A:

antheraxanthin

DES:

de-epoxidation state

E:

transpiration rate

F0 and F0′:

minimal fluorescence with all PS2 reaction centres open in the dark- and light-adapted state, respectively

Fm and Fm′:

maximal fluorescence with all PS2 reaction centres closed in the dark- and light-adapted state, respectively

Fv/Fm :

maximum quantum yield of PS2 photochemistry

Fv′/Fm′:

effective quantum yield of PS2 photochemistry

P N :

net photosynthetic rate

PS:

photosystem

WUE:

water use efficiency

Z:

zeaxanthin

ΦPS2 :

quantum yield of PS2 electron transport

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Authors and Affiliations

  1. Key Laboratary of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, The Chinese Academy of Sciences, Beijing, 100093, P.R. China

    Q. A. Wang, C. M. Lu & Q. D. Zhang

  2. Departments of Genetics, The Alexander Silberman Life Sciences Institute, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel

    Q. A. Wang

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

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  • DOI: https://doi.org/10.1007/s11099-005-0045-7

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