| 水稻雄性不育系天然异交率与花器性状的遗传相关 Ⅰ.双列杂交分析 |
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| 引用本文： | 李维明,蔡俊迈,周元昌.水稻雄性不育系天然异交率与花器性状的遗传相关 Ⅰ.双列杂交分析[J].福建农林大学学报(自然科学版),1988(2). |
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| 作者姓名： | 李维明 蔡俊迈 周元昌 |
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| 作者单位： | 福建农学院农学系，福建农学院农学系，福建农学院农学系 |
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| 基金项目： | 福建省自然科学基金资助课题 |
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| 摘 要： | 7对早籼不育系、保持系按完全双列杂交方式配制的不育杂种在田间进行天然异交试验。双列联合分析了天然异交率和14个花器性状。其中柱头宽、子房长和柱头角度的基因型差异不显著。与常规稻比较,不育系花器构造无显著改良,但开花习性有利于异交。花器构造诸性状与异交率呈遗传负相关,开花习性诸性状则相反。柱头单边和总外露率与异交率的关系最密切。遗传决定异交的最佳性状组合为高柱头外露、大柱头和小颖花。通径分析了各性状对异交的加性、非加性、表型和环境效应。讨论了现有不育系种质利用的途径和通过4个花器性状的改良提高不育系异交率的育种策略。
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| 关 键 词： | 水稻 雄性不育系 天然异交率 花器性状 双列分析 遗传相关 |
THE GENETIC CORRELATIONS BETWEEN THE NATURAL OUTCROSSING AND FLORAL CHARACTERS OF MALE STERILES IN RICE——Ⅰ.Diallel Analysis |
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| Li Weiming Cai Junmai Zhou Yuanchang.THE GENETIC CORRELATIONS BETWEEN THE NATURAL OUTCROSSING AND FLORAL CHARACTERS OF MALE STERILES IN RICE——Ⅰ.Diallel Analysis[J].Journal of Fujian Agricultural and Forestry University,1988(2). |
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| Authors: | Li Weiming Cai Junmai Zhou Yuanchang |
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| Abstract: | Seven male steriles(A)and their corresponding maintainers(B)were employed to make a full diallel set of 7×7 F_1(A_i×B_j;i,j=1,2,… …,7).The diallel F_1s,all of which are male sterile,were planted in alternate rows with a pollinator to investigate the genetic correlations be- tween the natural outcrossing and fourteen floral characters.The genetic differences among the MS lines with respect to stigma width,ovary length and stigma angle are non-significant.Compared with early-rice varieties, the floral structure of MS lines is not improved,but the increase of exserted stigma of MS lines is appearent.The GCV of all floral traits in MS lines is smaller than that in the conventional rice.The genetic correlations be- tween the outcrossing and floral structural traits are negative and those be- tween the outcrossing and the traits related to flowering behavior are posi- tive.The direct genetic path coefficients of the single stigma exsertion, stigma length,spikelet length and width are 1.145,0.458,-0.211 and -0.216,respectively.It's obvious that the available genotype of MS lines appeared in high stigma exsertion,long stigma and the less size of spike- let.Additive,nonadditive,phenotypic and environmental direct effects of the floral traits on the outcrossing are also estimated.Discussions have been made on the approach of making full use of current MS lines and the tactics of breeding high outcrossing male steriles by improving of single stigma ex- sertion,stigma length and grain size. |
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| Keywords: | rice male sterile natural outcrossing floral characters diallel analysis genetic correlation |
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