摘要
本试验用7个抗赤霉病的小麦品种组成7×7双列杂交,以病小穗数作为抗赤霉病指标,研究了这些组合F_1、F_2代抗赤性的遗传;用F_2代资料计算了病小穗数与7个主要农艺性状的相关性。结果表明,参试品种的抗赤性受2—4对主效基因支配。溧阳望水白、苏麦3号、新中长具有较多的显性抗赤基因,一般配合力好,能显著降低其杂交后代的病小穗数。病小穗数同时受加性和显性效应的作用,抗病对感病为部分显性。病小穗数与株高、单株穗数、单株粒重呈显著负相关,与其它性状无显著相关。
Half-diallel crosses involing 7 wheat varieties (T. aestivum, L.) with various degrees of scab resistanee were adopted in this study. The numbers of spikelets infeeted with scab in both F1 and F2 individuals were observed to study the inheritance of scab resistanee and correlations between the scab resistanee and 7 agronomic traits. The result's of this study showed that Wang-shui-bai, Sumai No. 3 and Xin-zhongchang might have more dominant genes controlling scab resistance and a higher general combining ability (GCA) in redueing the number of infected spikelets. The inheritance of scab resistanee seems to be governed by both genes with additive anddominant effeet. The 2—4 major genes controlling scab resistance were partially dominant. High negative genetic correlations between the number of infected spikelets and plant height, spikes per plant, grains weight per plant were found in F2 of diallel crosses.
出处
《上海农业学报》
CSCD
1992年第1期31-36,共6页
Acta Agriculturae Shanghai
关键词
小麦
赤霉病
抗性
遗传相关
Wheat, Scab resistance, Diallel cross, Genetic correlation
