醋栗番茄Solanum pimpinellifolium遗传多样性分析

野生种醋栗番茄包含丰富的变异,具有众多优良性状。本研究对从世界不同地区收集的433份醋栗番茄遗传资源进行了表型鉴定及遗传多样性分析。表型鉴定结果表明,在收集的433份醋栗番茄中约有14%为樱桃番茄,370份典型醋栗番茄中约22%的材料存在不同程度的分离。群体变异分析表明,不同性状间变异系数存在较大差异,其中柱头变异系数最大,为56.716%;花瓣数遗传稳定,变异系数最小,为2.082%;相关分析表明,多个性状间存在显著相关性;利用表型和基因型数据聚类均将醋栗番茄群体划分为两大类群;主成分分析表明,坐果率、单果重、可溶性固形物对变异的贡献率较大。研究结果将为利用醋栗番茄进行栽培种番茄遗传改良奠定一定的基础。

Genetic Diversity of Wild Tomato Species Solanum pimpinellifolium

Wild tomato species Solanum pimpinellifolium possesses rich variation in many elite characters. In this paper, we analyzed the phenotypic and genetic diversity of 433 genetic resources of S. pimpinellifolium collected from different resource center of the world. The results of phenotyping indicated that about 14% of these accessions are Solanum lycopersicum var. cerasiforme. Among 370 accessions of typical S. pimpinellifolium, about 22% of them are segregated on certain degree. Population variation analysis showed that variation coefficient varied among different traits. The maximum variation existed in stigma and is about 56.716%, while the minimum one is petals number with about 2.082%. Correlation analysis of different traits showed that there is significant correlation between different traits. Based on the data of phenotyping and genotyping, S. pimpinellifolium population were divided into two groups. Principal component analysis further showed that fruiting rate, fruit weight and soluble solids content makes great contribution to the variation. The obtained results may provide the basis for tomato genetic improvement by Solanum lycopersicum.