烟草对气候斑点病的抗性遗传研究  

Inheritance of tobacco resistance to weather-fleck

作　　者：殷全玉[1] 杨铁钊[1] 邵惠芳[1] 李惠君 王新发[1] 

机构地区：[1]河南农业大学,河南郑州450002 [2]河南省新郑烟草集团,河南新郑451100

出　　处：《中国烟草科学》2006年第1期16-19,共4页Chinese Tobacco Science

摘　　要：选择抗性不同的6个烤烟基因型,采用P(×P-1)/2双列杂交遗传交配设计方法,分析了烟草对气候斑点病的抗性(病情指数)和气孔导度的遗传方式。研究结果表明,烟草对气候斑点病的抗性和气孔导度大小均符合加性-显性遗传模型,抗病表现为隐性,感病为显性,气孔导度大表现为显性,气孔导度小表现为隐性。配合力分析表明,感病品种RG17、K326具有较高的正向一般配合力(增加病指、增大气孔导度,表现感病),抗病品种NC89、中烟90和中抗品种具有负向一般配合力(降低病指,减小气孔导度,表现抗病)。Six tobacco （Nicotiana tabacum） genotypes were selected as the parents of Px（P-1 ）/2 incomplete diallel cross to determine combing ability and genetic model of stomatal conductance on tobacco leaves and disease resistances to weather-fleck. The results showed that genetic characteristics of stomatal conductance on the lower epidermis of tobacco leaves and resistance to weather-fleck was Of additive-dominance genetic models. Recessive genes controlled disease resistance and small stomatal conductance, and dominant genes controlled disease susceptibility and big stomatal conductance. Susceptible genotypes possessed high positive GCA which was negative in resistant genotypes.

关 键 词：烟草气候斑点病 气孔导度 双列杂交 遗传 

分 类 号：S572[农业科学—烟草工业]