玉米自交系对镰刀菌茎腐病抗性的研究初报

玉米自交系对镰刀菌茎腐病的抗性存在着广泛的遗传变异(gcv=18.37%),并具有较高的遗传力(h~2=84.87%)。随着玉米年龄的增大,髓组织密度与髓组织含糖量间的相关系数的绝对值逐渐增大,在抽雄后19天和28天,正相关性达到了极显著水平。病害发展过程中各时期的髓组织密度对茎腐病级别的总效应和直接效应皆为负值;不同时期的髓组织

A Preliminary Study on the Resistance to Fusarium Stalk Rot in Corn Inbred Lines

There is a wide range of genetic variation(gcv=18.37%)and relatively highheritability(h~2=84.87%)with the resistance to stalk rot caused by Fusariummoniliforme in corn inbred lines.The absolute value of correlation coefficient between pith density and sugar content increases gradually with the age of the corn plant,and the correlations are highlysignificant at about 19 to 28 days after tasseling.The total effect and the derect effectof the pith densities at various stages of development of stalk rot are all negative.Thetotal effects of the sugar contents on stalk rot are different at the different stages,butthe direct effects are all positive.The resistances to stalk rots caused by Fusarium moniliforme and by Gibberellazeae are highly correlated(r=0.82).