**新疆阿勒泰地区5 个大赖草种群的表型多样性分析**

**Analysis on phenotypic diversity of five populations of Leymus racemosus in Altai Region of Xinjiang**

摘要 | 为了解大赖草种群[ |

Abstract |
In order to understand phenotypic variation law and diversity characteristics of L. racemosus distributed in Altai Region of Xinjiang (which were located in Altai City, Fuhai County, Buerjin County and Habahe County, respectively) were detected. On this basis, Shannon-Weaver index (H’) analysis and principal component analysis of these phenotypic characters were carried out. The results show that there is large difference in sixteen phenotypic characters among the populations, in which, averages of phenotypic characters of two populations distributed in Habahe County are higher. Coefficient of variation of phenotypic characters within populations is 5. 97% - 40. 05% with large difference. In which, coefficient of variation of length of the first internode under ear within populations is large with a value of 17. 16% -40. 05%. On the whole, variations of some characters related to vegetative growth (such as length of the first internode under ear, length and width of flag leaf, etc) within populations are large, while those related to reproduction are small. Among populations, coefficients of variation of length of the first internode under ear, length and width of flag leaf all are large with a value of 31. 85%, 26. 87% and 27. 85%, respectively, while those of lengths of spikelet and outer glume and number of ear pitch all are small with a value of 15. 21%, 16. 53% and 16. 91%, respectively. There is large difference in H’ value of sixteen phenotypic characters among five populations, and H’ average value of phenotypic characters within populations (1. 660) is obviously higher than that among populations (0. 239). The principal component analysis result shows that cumulative contribution rate of the first five principal components is 80. 210%, in which, loads of characters related to vegetative organs (such as plant height, length of the first internode under ear, length and width of flag leaf, number of node) in the first principal component are large, those of characters related to reproductive organs (such as length and width of ear, length of outer and inner glumes, length and width of spikelet, length of lemma) in the second to the fourth principal components are large, indicating that the twelve characters are dominant factors of variation of phenotypic characters of L. racemosus population. It is suggested that phenotypic diversity among populations of L. racemosus is lower than that within populations, and phenotypic variation of vegetative organs is dominant factor leading to phenotypic diversity of L. racemosus population. |

关键词 | 大赖草种群; 表型性状; 变异系数; 多样性分析; 主成分分析 |

Key words | Leymus racemosus (Lam.) Tzvel. population; phenotypic character; coefficient of variation; diversity analysis; principal component analysis |

作者 | 薛晓东a, 吾买尔夏提•塔汉a, 代培红b, 周桂玲a |

所在单位 | 新疆农业大学: a. 草业与环境科学学院, b. 农学院, 新疆乌鲁木齐830052 |

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基金项目 | 国家自然科学基金资助项目(31160134) |