棉花黄萎病抗性遗传研究

STUDIES ON THE INHERITANCE OF RESISTANCE TO VERTICILLIUM DAHLIAE IN COTTON

棉花对黄萎病（ＶｅｒｔｉｃｉｌｌｉｕｍｄａｈｌｉａｅＫｌｅｄ）抗性的遗传方式迄今尚有争议。本试验应用了１１个经过鉴定的抗、感亲本进行不同组合的杂交，用致病力强弱不同的菌系，采用单苗系和混合菌系接种，病菌孢子悬浮液接种和病菌毒素接种的方法，对各组合不同世代（Ｐ１、Ｐ２、Ｆ１、Ｆ２、Ｆ３、ＢＣ１、ＢＣ２）群体进行遗传分析。试验分１９８３～１９８５，１９８６～１９８８，１９８９～１９９１三轮连续进行，每轮试验所用的材料和方法不完全相同，所得试验结果相互吻合，并与前人研究结果有所不同，可以作为进一步研究抗性遗传及抗病育种问题的参考。

The inheritance of resistance to Verticillium dahliae in cotton is still a problem under debate.Eleven identified resistant and susceptible parental varieties were crossed in different combinations and were evaluated for resistance and susceptibility in different progeny generations.Different inoculation methods were used:single pathogenic fungus strain inoculation or mixed fungus strain inoculation;inoculation with pathogenic spore suspension or with pathogenic toxin.Genetic analyses were conducted in three rounds successively in 1982-1985, 1986-1989,and 1989-1991.Different materials and methods were used in each round of test,but resulted in similar conclusions.When single fungus strain inoculation method was used,resistance to Verticillium dahliae was proved to be controlled by one single dominant gene,but interaction between different genes can't be entirely ruled out as indicated by the results with Litai No. 8 as one of the parents.When mixed fungus strain inoculation was used, the antigonism action among different fungus strains was discovered,and host plants showed the positive or negative super dominant phenomena,and the phenomenon of common susceptibility among all combination progenies.This might be postulated as a result of effcets of different genes,but not the action of multiple alleies.