Characterization of photosynthesis, photoinhibition and the activities of C4 pathway enzymes in a superhigh-yield rice, Liangyoupeijiu |
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Authors: | Qiang Wang Congming Lu Qide Zhang Naibin Hao Qiaoying Ge Fengqin Dong Kezhi Bai Tingyun Kuang |
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Institution: | Laboratory of Photosynthesis Basic Research, Institute of Botany, Chinese Academy of Sciences, 100093, Beijing, China. |
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Abstract: | Characteristics of photosynthetic gas exchange, photoinhibition and C(4) pathway enzyme activities in both flag leaves and lemma were compared between a superhigh-yield rice (Oryza sativa L.) hybrid, Liangyoupeijiu and a traditional rice hybrid, Shanyou63. Liangyoupeijiu had a similar light saturated assimilation rate (Asat) to Shanyou63, but a much higher apparent quantum yield (AQY), carboxylation efficiency (CE) and quantum yield of CO(2) fixation (PhiCO(2)). Liangyoupeijiu also showed a higher resistance to photoinhibition and higher non-radiative energy dissipation associated with the xanthophyll cycle than Shanyou63 when subjected to strong light. In addition, Liangyoupeijiu had higher activities of the C(4) pathway enzymes in both flag leaves and lemmas than Shanyou63. These results indicate that higher light and CO(2) use efficiency, higher resistance to photoinhibition and C(4) pathway in both flag leaf and lemma may contribute to the higher yield of the superhigh-yield rice hybrid, Liangyoupeijiu. |
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Keywords: | superhigh-yield hybrid rice photosynthesis photoinhibition C4 pathway |
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