吉林省部分玉米种质资源抗玉米弯孢菌叶斑病鉴定研究

Identification of Jilin′s Maize Germplasm Resistance to Curvularia Leaf Spot

玉米弯孢菌叶斑病主要是由弯孢菌(Curvularia lunata)引起的侵染性病害。近年来,该病害在我国玉米主产区发生面积逐年扩大,已成为玉米重要病害之一。本文研究了吉林省主要玉米杂交种和自交系抗病性差异,结果表明:玉米杂交种间以及自交系间抗病性差异明显;吉63、黄早4、自330、丹9046、丹9041、铁7922、掖478、沈5003、丹340和E28等一批应用多年的种质资源均为感病类型(MS^HS);而新选育的各类群一些种质和具有热带、亚热带血缘的78599等一些外来种质资源均为抗病类型(R^HR)。杂交种的抗病性与双亲的抗病性有密切关系;玉米杂交种苗期较抗病,抽丝期极为感病,这表明杂交种抗性随植株生长而递减。

Curvularia leaf spot （CLS） was caused by Curvularia lunata mainly as well as other Curvularia species. In recent years the occurrence area of CLS was enlarged continually and the disease was became one of the important disease in main production zone of maize in China. In this studies the results showed that there were a mainly difference in resistance to CLS in maize hybrids, which were grew in Jilin Province, and inbred lines. Of the inbred lines Ji63, Huangzaosi, Zi 330, Dan 9046, Dan 9041, Tie 7922, Ye 478, Shen 5003, Dan 340 and E28, which were widely used as parents in the past breeding programs, were susceptible. Some new parent lines, which selected from 78599 line and some tropical and subtropical lines, were resistant. The resistance level of hybrids was closely related with the resistant level of the parents. In the field the resistance in seedling was highest and lowest in tasselling stage, that means the plant resistance level was dropped when the plant grow up.