陆地棉×陆地棉半野生种族系后代的枯、黄萎病抗性鉴定和筛选

对陆地棉栽培种与四个陆地棉半野生种族系杂交的F_2—F_4的抗枯、黄萎病特性鉴定筛选结果表明:四个组合后代抗黄萎性较强,病指在11.5%以下;鄂沙28×莫尔利棉和尖斑棉两个组合后代与对照86—1比较,抗枯萎性最强,鄂沙28×墨西哥棉和阔叶棉组合后代抗枯萎性较差,说明四个半野生种族系具有较强的抗萎性因子存在。对陆地棉与半野生种族系杂交低世代进行连续抗病筛选,抗病效果明显提高。

SCREENING RESOURCES RESISTANT TO VERTICILLIUM AND FUSARIUM WILTS IN COTTON

The resistance to both Fusarium and Veticillum wilt of F_2--F_4 from the hybrid combinations between upland cotton cultivar and four races of Gossypium hirsutum L. (Morrilli, punctatum, latifolum Mexicaum) was identified and screened. The results showed that the disease index of F_4 from four combinations was below 11.5%. and displayed st-onger resistance to Fusarium. The resistance of F_4 of sha--28Morrilli and punctatum w(?)s better, but the resistnace of the other two combinations was worse than 86--1. It was quite ovious that there were some factors resistant to wilt diseased in hirsutum L. races. If the lower gernerations were idntified and screened year. in diseases field, their ability to resist disease would be greatly raised. The resistance of populations from several backcrossing and self were also identified, and some results were discussed in this paper.