玉米丝黑穗病的抗源鉴定及抗性遗传研究

为了鉴定玉米自交系对丝黑穗病的抗性,研究抗病力遗传效应,采用人工接种鉴定法,研究评价了72份玉米自交系对丝黑穗病的抗性。其中高抗系18个,占25%,抗病系15个,占20.8%,中抗系12个,占16.7%。玉米对丝黑穗病的抗性遗传属细胞核遗传,无正反交差异。F1和F2的发病率介于双亲之间,无超亲优势,F1与抗病亲本回交的后代基本表现为抗病,与感病亲本回交后代表现为感病。要选育中抗以上类型杂交种,其双亲之一必须为抗病系,其杂交方式有:高抗×高抗、高抗×抗病、高抗×中抗、抗病×抗病、抗病×中抗。

The Identification of Resistance Sources and Inheritance of Resistance to Head Smut in Maize

The resistance of 72maize inbred lines to head smut of maize was assessed using the artificial inoculation method for identifying the resistance of maize inbred lines to head smut of maize and studying resistance’s genetic effect.The results showed that 18of those lines were highly resistant,15lines were resistant and 12 were middle resistant,the percentage was respectively 25%,20.8%and 16.7%.The inheritance of maize resistance was controlled by nuclear,and there was no difference in reciprocal cross.The incidence of F1and F2 was in the middle of their parents,with no super advantage compared the parents,descendants of F1and the parent were resistant,and crossed with sensitive lines could generate resistant lines.So to breed hybrid with middle or high resistance,one of the parents must be the high resistant line,and the cross ways should be:HR×HR;HR×R;HR×MR;R×R;R×MR.