胡萝卜种质资源的农艺性状及黑斑病抗性研究

在安徽萧县多年连作基地对160份国内外胡萝卜种质资源进行主要农艺性状及3个时期(T1、T2、T3,分别为播种后70、90、110 d)的黑斑病病级指数调查。结果表明:黑斑病病级指数随着胡萝卜生长而逐渐增加,3个时期的平均病级指数之间存在显著差异,分别为0.9、1.8、2.1。基于T3时期的病级指数,160份材料共分为5类,其中第Ⅰ类材料抗性最强,病级指数为0.25～0.75,共21份,其地上部的主要农艺性状指标显著优于其他类群。

Studies on Agronomic Traits and Resistance to Alternaria Leaf Blight of Carrot Germplasm Resources

This paper conducted investigation at a continuous cropping land for many years in Xiao County of Anhui Province on the main agronomic traits and disease level indexes of Alternaria leaf blight during 3 growth periods（T1，T2 and T3，70，90，110 days after sowing）of 160 carrot accessions from abroad and at home. The results showed that the disease level indexes of Alternaria leaf blight increased gradually with the growth of carrot and there were significant differences between the 3 periods. The average disease level indexes were 0.9， 1.8 and 2.1，respectively. Based on T3 index，160 accessions could be divided into 5 groups，and group I had the strongest resistance including 21 accessions. Their disease level indexes were 0.25-0.75. The upper ground main agronomic traits of group I were also significantly better than those of the other groups.