陆地棉品种和骨干品系黄萎病抗性鉴定

选育和推广抗病品种是防治陆地棉黄萎病的主要措施,为了早日实现多类型、多区域大面积抗病品种的应用,本研究选取107份遗传背景差异较大的种质,利用河北省农林科学院棉花研究所小安舍试验站黄萎病病圃进行了3年黄萎病抗性重复鉴定。鉴定得到抗病品系8个,占7.5%;耐病品种(系)20个,占18.7%。本研究表明,当前被作为育种亲本的抗病品系还太少,需要深入开展抗病遗传机制,以及与其他经济性状协同改良的关系,为陆地棉抗病育种提供理论指导;达到抗病或接近抗病水平的大部分品种(系)来自于海陆野远缘后代,具有外源基因血统,证明了远缘杂交是陆地棉黄萎病抗性改良的有效手段。

Identification of breeding germplasm resistance to verticillium wilt in Gossypium hirsutum

Breeding and application of disease resistant varierties is the preferred method to control Verticillium wilt diseases, it is important to broaden the genetic base of upland cotton for continuous genetic improvement of disease resistance. The objectives of this study were to evaluate 107 upland cotton main breeding germplasm includes introgressed lines from G. barbadense were identified in Verticillium dahliae nursery for three years repeat identification experiments. The results showed that only 8 disease-resistant germplasm were screened, accounted for only 7.5% of 107 accessions; disease-tolerant cultivars or lines were 20 accessions, were 18.7%; The identified results indicated that it is scarcity of sources of disease resistant germplasm can be used as breeding parent at present. So it is necessity to research on disease-resistant genetic mechanism and collaborative improved relations with other economic characters, and provided theoretical guidance for cotton resistance breeding. The analyses suggest that distant hybridization breeding was a powerful way of creation of germplasm resistance to verticillium wilt in upland cotton.