Biological Effects in Heterotic Combination with Novel Adaxially-rolling Character in Rice(Oryza sativa L.)  

一个新的水稻内卷叶突变体的杂优组合生物学效应（英文）

作　　者：龚晓平 况晓明 罗挺 李加胜 赵许兵 赵冰峰 曾胜 张致力 

机构地区：[1]重庆市渝东南农科院,重庆涪陵408000

出　　处：《Agricultural Science & Technology》2015年第11期2504-2508,2512,共6页农业科学与技术（英文版）

基　　金：Supported by Chongqing Major Scientific and Technological Project(6887);Science and Technology Key Project of Chongqing Science and Technology Committee(CSTC,2009AB1061)~~

摘　　要：Taking the heterotic combinations which respectively had moderately-rolled leaves and flat leaves at middle and later stages as tested materials, the biological effects in the heterotic combination of the moderately-roiling leaf mutant RL（f） were studied. The results showed that （i） there was insignificant difference between the leaf morphological characteristics of the RL（t） and fiat leaf heterotic ombinations at early growth stage in that beth of them had fiat leaves and relatively big basic leaf angles; （it） the stomatal conductance, the intercellular CO2 concentration, transpira- tion rate and photosynthetic rate of the three top leaves of the RL（t） heterotic com- bination were significantly higher than those of the flat leaf heterotic combination at middle and later stages, which laid the foundation for increasing the yield per unit area; （iii） the light transmittance of the RL（f） heterotic combination in population at the middle part was higher than that of flat leaf heterotic combination, resulted in improved light interception condition at middle and lower parts of the population and increased the utilization efficiency of tight energy; and （iv） this research revealed that the RL（t） heterotic combination could not only maintain a larger amount of the effective panicles but also could present large-panicle characteristic, especially in high-density condition, and also the ability of adjusting yield components the RL（f） heterotic combination was significantly increased under different densities. This study would provide a theoretical basis for the principle of high-yielding breeding with the application of the moderately-rolling leaf mutant in rice.以生育中后期叶片适度内卷叶和平展叶组合为材料,研究了水稻适度内卷叶突变体RL(t)杂优组合的生物学效应。结果表明:①RL(t)杂优组合与平展叶组合生育前期生长叶态相似,均为平展叶且叶基角较大;②RL(t)杂优组合生育中后期叶片气孔导度、胞间CO_2浓度、蒸腾速率显著高于平展叶组合,其光合速率较平展叶组合也有所提高,为其提高单位面积产量奠定了基础;③RL(t)杂优组合在群体中部透光率显著高于平展叶组合,改善了群体中下部叶片受光条件,从而提高了光能利用率:④RL(t)杂优组合在不同密度下产量构成因子自我调控能力显著增强,尤其在高密度下,具有较高的容穗量,并能较好地保持大穗特点。本研究为适度内卷叶应用于水稻高产育种提供理论依据。

关 键 词：RICE Moderately rolling STRAIGHTNESS Photosynthetic rate Ught transmittance 

分 类 号：S511[农业科学—作物学]