摘要
分析了来源于长雄蕊野生稻Ｏｒｙｚａｌｏｎｇｉｓｔａｍｉｎａｔａ的显性抗性基因Ｘａ－２１在籼粳稻不同背景下的遗传表现及转育效应。结果表明，Ｘａ－２１基因的抗性表达受不同亚种遗传背景的影响，在粳稻背景下抗性表达充分，呈完全显性遗传，并具有较强的转育效应；而在籼稻背景下，抗性表达不充分，呈不完全显性遗传。同时对育成的晚粳ＤＰ５１６５、ＤＰ５１４８品系对我国水稻白叶枯病不同致病型菌系的抗性进行了评价，并就利用Ｘａ－２１基因改良杂交稻的白叶枯病抗性作了讨论。
The genetic behavior and transfer effect of dominant gene Xa-21 with wide resistance-spectrum derived from Oryza longistaminata was analyzed in indica and japonica background. The results indicated the resistance express of Xa-21 was affected by different subspecies background. The gene Xa-21 could fully express its resistance in japonica background and showed complete dominance heredity, had stronger transfer effect for resistance; but it could not fully express its resistance and showed incommplete dominance heredity in indica background. Meanwhile, resistance of late japonica lines DP5165, DP5148 to the various pathogenic strains of bacterial blight in China was evaluated. Improving resistance of hybrid rice to bacterial blight by introducing Xa-21 gene was discussed.
出处
《浙江农业学报》
CSCD
1996年第2期70-73,共4页
Acta Agriculturae Zhejiangensis
基金
浙江省自然科学基金
关键词
遗传效应
育种
白叶枯病
水稻
抗病性
Resistance resources
Genetic effect
Disease resistance breeding
Bacterial blight
Rice
