番茄遗传资源的聚类分析研究

The Cluster Analysis on Tomato Germplasms

通过测定番茄品质特性的遗传多样性和分子标记的多态性,对番茄品种资源进行了聚类分析。结果表明,品质特性聚类分析和分子标记聚类分析最后都形成了四大类群,而且都把果实硬度大、软化速度慢、果型长圆、含水量低、可溶性固形物含量高的加工番茄聚合在了一起,说明一些分子标记可能和控制番茄加工品质特性的基因有比较紧密的连锁关系。分子标记更能灵敏地区分不同品种间的遗传差异。不同类群间品质性状的差异明显大于群内不同品种间的差异,说明聚类分析是鉴别品种资源遗传差异程度、筛选核心资源的有效手段。

Cluster analysis on tomato germplasms were carried out based on the genetic diversity of quality traits and polymorphism of molecular markers. Experimental results showed that 4 groups were clustered by either quality traits or molecular markers. Processing tomato germplasms with high fruit firmness, slow softening speed, long-round fruit, low water content and high soluble solid content were clustered together in the two system, which indicated that some molecular markers closely linked with genes controlling processing quality traits. Genetic diversity among different cuhivars could be detected by molecular markers sensitively. The quality differences among different groups were apparently greater than that among cultivars in the same group. It was concluded that cluster analysis was an efficient method for identifying genetic diversity among gennplasms and screening core gennplasms.