白花桔梗和紫花桔梗的种子性状比较

目的]对白花桔梗和紫花桔梗种质资源的种子性状进行调查分析。方法]以来自国内外的13种白花桔梗和紫花桔梗种质资源为研究对象，比较分析它们的种子性状，包括种子长度、宽度、厚度、千粒质量4项指标。结果]白花桔梗种质资源的种子长度、宽度、厚度、千粒质量的平均值均小于紫花桔梗种质资源；在种子长度上，除了朝鲜白花的种子较长以外，其他白花桔梗种质资源的种子长度均比紫花桔梗的长度小；在种子宽度上，除朝鲜白花、黑龙江宁安、韩国江原外，白花桔梗种子宽度基本上都比紫花桔梗的宽度小；在种子千粒质量上，除了朝鲜罗津和三成白花外，其他白花桔梗种质资源的种子千粒质量均极显著（P〈0.01）小于紫花种质资源。结论]该研究为紫花桔梗和白花桔梗种质资源的合理利用提供了参考依据。

Comparative Study on Seed Traits of Purple Flower Platycodon grandiflorum and White Flower Platycodon grandiflorum

Objective] The experiment aimed to carry out investigation and analysis on seed traits of white flower Platycodon grandiflorum and purple flower Platycodon grandiflorum.Method] 13 white flower Platycodon grandiflorum and purple flower Platycodon grandiflorum from China and foreign countries were taken as research objects.Their seed traits such as seed length,seed width,thickness of seed and 1 000-grain weight were comparatively analyzed.Result] The average seed length,average seed width,average seed thickness and average 1 000-grain weight of white flower Platycodon grandiflorum were all smaller than these of purple flower Platycodon grandiflorum.The seed length of Korean white flower Platycodon grandiflorum was relatively longer and seed lengths of other white flower Platycodon grandiflorum were all shorter than these of purple flower Platycodon grandiflorum.The seed widths of white flower Platycodon grandiflorum were smaller than these of purple flower Platycodon grandiflorum,except these of Korean white flower Platycodon grandiflorum,Heilongjiang Ning'an and South Korean Jiangyuan.The 1 000-grain weights of white flower Platycodon grandiflorum were all smaller than these of purple flower Platycodon grandiflorum,except these of Korean Rajin and Sancheng white flower Platycodon grandiflorum.Conclusion] The result of this experiment provided reference for rational utilizations of purple flower Platycodon grandiflorum and white flower Platycodon grandiflorum.