ASSOCIATIONS BETWEEN 3 ML-O POWDERY MILDEW RESISTANCE GENES AND AGRONOMIC TRAITS IN BARLEY
ASSOCIATIONS BETWEEN 3 ML-O POWDERY MILDEW RESISTANCE GENES AND AGRONOMIC TRAITS IN BARLEY
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DOI：
10.1007/bf00027217
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发表时间：
1990-04-01
期刊：
影响因子：
1.9
通讯作者：
JORGENSEN, JH
中科院分区：
文献类型：
--
作者：
KJAER, B;JENSEN, HP;JORGENSEN, JH
对198个染色体加倍的春大麦单倍体品系的4号染色体上的位点ml-o（白粉病反应）和7号染色体上的连锁位点s（小穗轴毛长）和ddt（对杀虫剂DDT的反应）进行了分离评分。还在无病田间试验中测试了它们的农艺性状：籽粒产量、千粒重、倒伏和坏死叶斑病。三个诱变剂诱导的抗性基因ml-05、ml-06（来自“嘉士伯II”）和ml-10（来自“Foma”）在对农艺性状的影响方面没有显示出可检测的差异。它们都使谷物产量减少了4%，主要是由于千粒重降低和坏死叶斑增加。“嘉士伯II”的两个原始突变体具有影响农艺性状的额外突变基因。具有基因S（长毛）的品系的千粒重平均比具有基因S的品系高3%。ddt位点的等位基因与农艺性状无关联。得出的结论是：i）三个ml-o等位基因与农艺性状之间的关联是由多效性引起的，ii）可以选择ml-o抗性高产系，iii）基因s与千粒重之间的关联可能是由于遗传连锁。
A population of 198 chromosome-doubled haploid lines of spring barley was scored for segregation in locus ml-o (powdery mildew reaction) on chromosome 4 and in the linked loci s (rachilla hair length) and ddt (reaction to the insecticide DDT) on chromosome 7. They were also tested in a disease-free field trial for the agronomic traits: grain yield, thousand grain weight, lodging, and necrotic leaf spotting. The three mutagen-induced resistance genes ml-05, ml-o6 (from ''Carlsberg II'') and ml-10 (from ''Foma'') showed no detectable differences with respect to effects on agronomic traits. They all conferred a four per cent reduction in grain yield caused mainly by lower thousand grain weight, and an increase in necrotic leaf spotting. The two original mutants of ''Carlsberg II'' had additional mutant genes affecting agronomic traits. Lines with gene S (long hair) had on average a three per cent higher thousand grain weight than those with s. The alleles in locus ddt showed no association with the agronomic traits. It is concluded i) that the associations between the three ml-o alleles and agronomic traits are caused by pleiotropy, ii) that ml-o resistant, high-yielding lines may be selected, and iii) that the association between gene s and thousand grain weight may be due to genetic linkage.