玉米茎秆高糖种质资源筛选与评价

Screening and Evaluation for High Sugar Content of Stem in Maize Germplasm

以151个玉米自交系为材料,对玉米茎秆高糖种质资源进行了筛选与评价。结果表明,自交系茎秆含糖量(B rix)变化范围为3.5%～16.9%,能为茎秆高糖玉米新品种选育所利用的自交系(B rix≥10%)种质资源比较丰富,约占测定自交系总数43.1%。通过聚类分析,151个玉米自交系按茎秆含糖量差异可分为3大类,第3类属于茎秆高糖类型(12.3%～16.9%),共有22个自交系,这一类群种质可能是培育茎秆高糖玉米新品种的重要亲本材料,其中78599-1-550、78599-2、YXD053-646、Y53-245、预CY509等5个自交系尤其适合作为茎秆高糖玉米育种亲本。

Germplasms with high sugar content in stem are of importance for silage maize breeding.One hundred and fifty one maize inbred lines were screened for evaluation of sugar content in stem in this study.The results were summarized as follows,the Brix in stem ranged from 3.5 to 16.9,65 out of 151 inbred lines（43.1%）had sugar content up to 10%,and these inbred lines might be useful for improvement of sugar content of hybrid stem.All the tested inbred lines were divided into three types using cluster analysis method according to their sugar content in stem.TypeIII included 22 inbred lines and these lines had high sugar content of stem（Brix=12.3%～16.9%）,which might be pivotal to increase sugar content of maize hybrid stem.Five out of these 22 lines including 78599-1-550,78599-2,YXD053-646,Y53-245 and YU-CY509 could be desirable genotypes considering their high sugar content in stem and superior agronomic characters.