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【目的】鉴定与评价1498份广西普通野生稻对白叶枯病的抗性,为培育广谱持久的白叶枯病抗性水稻品种提供材料。【方法】利用华南籼稻区优势菌株(Ⅳ型),对1498份广西普通野生稻进行抗性初筛鉴定;并根据初筛获得的部分抗性稳定材料进行多菌系重复鉴定;对广西普通野生稻的居群抗病性与遗传多样性进行相关分析。【结果】经抗性初筛,获得70份对白叶枯病抗性稳定的材料;利用7个广西优势菌株(广西Ⅰ~Ⅶ型菌株)对其中60份材料进行广谱抗性筛选鉴定,结果发现在60份材料中,对Ⅰ~Ⅶ菌株抗性表现中抗以上的材料分别为43、50、45、58、52、46和46份。两份材料(RB11和RB19)对7个供试菌株均表现为抗水平;3份材料(RB5、RB7和RB31)分别对Ⅶ、Ⅴ、Ⅴ型菌株表现高抗。相关性分析结果表明,广西普通野生稻抗性材料出现的频率与居群遗传多样性指数相关性不显著,但与居群地理纬度呈极显著负相关。【结论】鉴定获得一批广谱抗源和高抗野生稻材料,可作为今后水稻白叶枯病抗性育种的重要抗源亲本。
【Objective】 The objective of the study was to identify and evaluate the resistance of 1498 common wild rice cultivars to bacterial leaf blight in Guangxi and provide materials for cultivating broad-spectrum and persistent bacterial blight-resistant rice varieties. 【Method】 1498 samples of common wild rice from Guangxi were identified by means of dominant strains (type Ⅳ) in South China indica rice. The resistance of the materials was determined by repeated screening of some of the resistant materials. The population resistance and genetic diversity of rice were analyzed. 【Result】 The results showed that 70 isolates with stable resistance to bacterial blight were obtained through resistance screening. Six of Guangxi’s dominant strains (Guangxi strain Ⅰ-Ⅶ) It was found that among the 60 materials, the resistances of strains Ⅰ-Ⅶ were 43, 50, 45, 58, 52, 46 and 46, respectively. The two materials (RB11 and RB19) showed resistance to all seven tested strains. Three materials (RB5, RB7 and RB31) showed high resistance to the Ⅶ, Ⅴ and Ⅴ strains respectively. Correlation analysis showed that there was no significant correlation between the occurrence frequency of common wild rice resistance material and the population genetic diversity index in Guangxi, but significant negative correlation with the geographical latitude of population. 【Conclusion】 The identification of a number of broad-spectrum resistant and highly resistant wild rice cultivars could be used as an important resistant parent for the resistance breeding of rice bacterial blight in the future.