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水稻远缘杂交后代的耐强光和抗光氧化特性 被引量:14

Characteristics of Photosynthesis and Photo-oxidation in the Hybrid between Oryza sativa and Oryza rufipogon
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摘要 为探明通过远缘杂交(Oryza sativaAzucena×Oryza rufipogonRamper6)手段获得的水稻高光合后代株系(SHPF6)在生长关键时期的耐强光和抗光氧化能力,本文以生育期一致的推广品种中花10号为对照,进行了光合作用测定和抗光氧化特性的研究。结果表明,强光下SHPF6表现较高的净光合速率Pn,并随着光强进一步增强而有较大的上升,这种高光合优势突出表现于Pn与胞间CO2浓度(Ci)的极显著负相关(r=-0.767,P<0.01),及气孔导度(Gs)、蒸腾速率(Tr)无论光强大小均高于对照;光氧化条件下,中花10号Fo显著升高(P<0.05),Fv/Fm和Fv/Fo均显著降低(P<0.05),而SHPF6各荧光参数在统计上没有较大差异,说明SHPF6具有较强的抗光氧化能力。这些结果意味着,通过远缘杂交手段,不仅可以提高普通栽培品种的光合速率和CO2羧化能力,还能改善水稻的抗光氧化能力。 During the grain-filling period,photosynthesis in rice plants contributes 60%-100% of the final grain carbohydrate,but in the mean time,photo-oxidation caused by low temperature and high light is always suffered by top leaves.So it is same importance to increase the resisting photo-oxidation,as well as to improve net photosynthetic rate(Pn)in this period.In previous works,the progenies(SHPF6)which had high net photosynthetic rate were obtained from the hybrids Oryza sativa Azucena × Oryza rufipogon Ramper 6...
出处 《作物学报》 CAS CSCD 北大核心 2006年第12期1913-1916,共4页 Acta Agronomica Sinica
基金 国家自然科学基金项目(30370853)
关键词 远缘杂交 野生稻 光合作用 光氧化 Wild cross Wild rice Photosynthesis Photo-oxidation
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