小麦种质对麦长管蚜的抗性鉴定与评价

2002-2005年连续4年,选用蚜情指数法对小麦种质进行麦长管蚜田间自然感蚜抗性鉴定,从2000份小麦种质中筛选出不同抗性材料34份,占总鉴定材料的1.7%,其中高抗种质5份、抗性种质9份、中抗种质20份。利用苗期室内接虫法,对部分抗感小麦种质进行鉴定,结果表明,苗期的抗性表现与成株期基本一致。对杂交组合临远207(抗)×Witchita(感)的F1、F2的抗性遗传分析表明,临远207对麦长管蚜的抗性由1对显性单基因控制。

Screening and Evaluation of Wheat Germplasm for Resistance to the Aphid (Sitobion avenae )

The grain aphid(Sitobion avenae Fabricius) is an important pest of wheat.From 2002 to 2005,thirty-four accessions with the different degree of resistance to the aphid were screened out of 2000 wheat germplasm,accounting for 1.7% of the whole varieties,including five highly resistant accessions,nine resistant ones and twenty moderately resistant ones by the method of aphid index.A part of resistant and susceptible was assessed through glasshouse screening of seedling technique and the result indicated that resistance in the seedlings and adult wheat was similar.Genetic analysis of resistance was performed using the F_1 plants and F_2 populations derived from a cross between the resistant Linyuan207 and susceptible Witchita.The result showed that a single dominant gene conditioned the resistance in Linyuan207.