[Objective] The aim was to determine light transmittance of different rolled - leaf traits rice leaf,and analyze its effects on yield traits. [ Method] Light transmittance and yield traits of B6C2 groups obtained through backcrosses between rice near-isogenic lines with rolled- leaf traits B6C2 and B5C2 were determined. [ Result] in sunny condition,the change trend of light transmittance of different rolled- leaf traits rice leaf was basic consistent:light transmittance at different growth stages was tillering stage > harvest stage > initial heading stage,namely light transmittance firstly decreased and then increased with advance of growth stages. In cloudy condition, light transmittance of different rolled- leaf traits rice leaf decreased with advance of growth stages. In a general,in same growth stages and same type of weather,light transmittance of rolled leaf was greater than that of flat leaf. [Conclusion] That the larger light transmittance improves rice groups sunshine acceptance rate,making dry matter accumulation amount of rolled- leaf plant greater than that of flat leaf plant, is an important development of rice production.%[目的]测定不同卷叶性状的水稻(Oryza sativa L.)叶片的透光率,并分析不同透光率对产量性状的影响.[方法]用构建的水稻卷叶近等基因系B6C1和B5C2回交得到B6C2,对B6C2群体进行透光率及产量性状的测定.[结果]在晴天条件下,不同卷叶性状的水稻叶片透光率的变化趋势基本一致:不同生育时期透光率的变化为分蘖期＞收割期＞始穗期,即随着生育时期的推进透光率先降低然后升高.在阴天条件下,透光率随不同生育时期的推进逐渐减小.总体上,相同生育时期和相同天气类型下,卷叶叶片的透光率均大于平叶叶片.[结论]透光率变大提高了水稻群体的受光效率,使卷叶植株的干物质积累大于平叶,是水稻增产的重要发展方向.
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