Abstract: In order to study genetic regularity of centipede grass aluminum tolerance, F₁ segregated populations were obtained from two centipede grass accessions[E102 and E092(1)] with different aluminum tolerances. Relative root dry weight, relative shoot dry weight, relative whole plant dry weight of 73 offsprings of F₁ groups were measured. A total of 73 hybrids with their parents were tested using Major Genes and Polygenes Genetic Analysis method. Results showed that coefficient of variation, relative root weight, relative shoot weight, and relative total weight were 42.28%, 25.36%, 21.76% and 20.15% respectively. The best genetic model for aluminum tolerance of this population was model A-0, namely no major gene controlled this characteristic. This study clarifies the genetic regularity of centipede grass aluminum tolerance and provides scientific basis for an aluminum tolerance gene and QTL positioning, varieties improvement and marker assisted breeding.

Key words: Centipede grass, F₁ hybrids, Aluminum tolerance, Genetic analysis

摘要： 为探讨假俭草(Eremochloa ophiurtoides (Munro.) Hack.)耐铝性的遗传规律,选用耐铝性存在差异的假俭草种质材料E102和E092(1)进行杂交,获得F₁分离群体,并测定F₁群体73份后代和2份亲本的相对根系干重、相对地上部分干重、相对全株干重,以耐铝隶属函数值为指标,应用植物数量性状主基因+多基因混合遗传模型分析方法对F₁群体的耐铝性进行遗传分析。结果表明:在调查的3个生物量指标中,变异系数由大到小依次是相对根系干重(25.36%)>相对地上干重(21.76%)>相对全株干重(20.15%),耐铝隶属函数的变异系数为42.28%;耐铝性的最佳遗传模型为A-0模型,即无主基因模型,表明该群体中耐铝性状表现出由误差或误差+多基因所修饰的单一正态分布特征。本研究明确了假俭草耐铝性状的遗传规律,为假俭草耐铝性的基因和QTL定位以及品种改良、标记辅助育种等方面提供科学依据。

关键词: 假俭草, 杂交后代, 耐铝性, 遗传分析