棉花抗黄萎病品种选育方法探讨

 在棉花抗病育种中,通过病圃或重病地选择抗病单株是常规的选育方法,但其在抗黄萎病育种中的效果并不理想。如何提高抗黄萎病育种效率,促进育种进程是目前急需解决的问题之一。为此,19982002年我们在北京人工病圃,对不同抗病杂交组合和选育方法的选育效果进行了研究。结果表明,在双亲本均为抗(耐)品种的杂交后代群体中,以9月中旬是抗病还是感病并没有多少关联,对黄萎病抗性的选育应选群体抗病性强的株系或组合,以其丰产性为主要选育目标;只有抗与抗(或高耐)的组合中才能选出黄萎病抗性更高的株系;在抗(耐)品种中,后期无论是抗或感的单株其后代的抗病性差异不明显

Study on the method of breeding cotton for resistance to Verticillium dahliae

A method that is often used in breeding cotton for resistance to V. dahliae is to select indivi-dual plants under the condition of disease nursery or seriously infected fields.We evaluated the effectiveness of this method in Beijing during 1998-2002.Selection for both resistant and susceptible individuals was conducted in four types of population:(1) F₂ plants from resistant×resistant crosses, (2) F₂ plants from resistant×susceptible crosses, (3) plants from resistant×tolerant crosses, and (4) plants from resistant variety. The results showed that selection was effective only in the population of type (1) at middle-late growth stages of cotton plants. In resistant or tolerant varieties, no difference was found in resistance between resistant and susceptible plant progeny in later time.