摘要
目的:研究不同种源香椿种子性状多样性和地理变异规律,为香椿种质收集、保存及良种选育提供理论依据.方法:以贵州省8个种源香椿的种子为试材,测定种子的表型性状和质量性状,开展方差分析和相关性分析,并用主成分分析综合评价种子质量.结果:不同种源的香椿种长、种宽、种子长宽比、千粒重、发芽率、发芽势、发芽指数和场圃发芽率均存在差异.不同种源种子性状变异系数变幅为5.26%～13.86%,千粒重的变异系数最大,安龙种源的千粒重最大,为18.67 g,极显著高于其他种源.种长与种宽、长宽比、千粒重、发芽率和发芽指数呈极显著正相关;种宽与千粒重呈极显著正相关;种子的长宽比与千粒重、发芽率和发芽指数呈极显著正相关.结论:千粒重、种长和发芽率可作为香椿种子质量评价的主要指标.综合评价得出安龙种源种子质量最佳,关岭种源次之.
Abstract
Objective:To study the diversity of seed traits and geographical variation of Toona sinensis from different provenances,which would provide theoretical basis for the collection and presevation of T.sinensis germplasm resources and breeding of improved varieties.Methods:The phenotypic charac-ters and quality characters were measured from eight provenances of T.sinensis in Guizhou.The vari-ance analysis and correlation analysis were carried out,and the seed quality was evaluated by principal component analysis.Results:There were differences in seed length,seed width,length width ratio,thousand-grain weight,germination rate,germination potential,germination index and germination rate of field among different provenances of T.sinensis.The variation coefficient of seed traits ranging from 5.26% to 13.86% among different provenances.The coefficient of variation of thousand-grain weight was the largest.The largest thousand-grain weight of Anlong provenance was 18.67 g,which was significantly higher than other provenances.The seed length was significantly positively correlated with seed width,length width ratio,thousand-grain weight,germination rate and germination index.The seed width was significantly positively correlated with thousand-grain weight.The length width ra-tio was significantly positively correlated with thousand-grain weight,germination rate and germina-tion index.Conclusion:Thousand-grain weight,seed length and germination rate could be used as the main indexes of seed quality evaluation of T.sinensis.Comprehensive evaluation showed that the seed quality of Anlong provenance was the best,followed by Guanling provenance.
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