Section 12
Chapter 11,113

PS II photochemistry and xanthophyll cycle in two superhigh-yield rice hybrids, Liangyoupeijiu and Hua-an 3 during photoinhibition and subsequent restoration

Wang-Qiang; Zhang-Qi-De [author, Reprint-Author]; Zhu-Xin-Guang; Lu-Cong-Ming; Kuang-Ting-Yun; Li-Cheng-Quan

Acta Botanica Sinica 44(11): 1297-1302


ISSN/ISBN: 0577-7496
Accession: 011112018

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PS II photochemistry and xanthophyll cycle during photoinhibition (exposed to strong light of 2 000 mumol photonscntdotm-2cntdots-1) and the subsequent restoration were compared between two superhigh-yield rice hybrids (Liangyoupeijiu and Hua-an 3, the newly developed rice hybrids from two parental lines) and the traditional rice hybrid Shanyou 63 developed from three parental lines. The results showed that the maximal efficiency of PS II photochemistry (Fv/Fm), the efficiency of excitation energy capture by open PS II centers (Fv'/Fm'), and the yield of PS II electron transport (PHIPS II) of the three rice hybrids decreased during photoinhibition. However, a greater decrease in Fv/Fm, Fv'/Fm', and PHIPS II was observed in Shanyou 63 than in Liangyoupeijiu and Hua-an 3. At the same time, the components of xanthophyll cycle, antherxanthin (A) and zeathanxin (Z) increased rapidly while violaxanthin (V) decreased considerably. Both the rate of accumulation and the amount of A and Z in the two superhigh-yield rice hybrids were higher than that in Shanyou 63. The de-epoxidation state (DES) of xanthophyll cycle increased rapidly with the fast accumulation of A and Z, and reached the maximal level after first 30 min during photoinhibition. Of the three hybrids, the increasing rate of DES in Liangyoupeijiu and Hua-an 3 was higher than that in Shanyou 63. After photoinhibition treatment, the plant materials were transferred to a dim light (70 mumol photonscntdotm-2cntdots-1) for restoration. During restoration, both chlorophyll fluorescence parameters and xanthophyll cycle relaxed gradually, but the rate and level of restoration in the two superhigh-yield rice hybrids were higher than those in Shanyou 63. Our results suggest that Liangyoupeijiu and Hua-an 3 had higher resistance to photoinhibition and higher capacity of non-radiative energy dissipation associated with xanthophyll cycle, as well as higher rate of restoration after photoinhibition, than Shanyou 63 when subjected to strong light.

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