| Summary: | 碩士 === 國立中興大學 === 農藝學系所 === 102 === Echinacea purpurea (L.) Moench, is a traditional North American perennial medicinal herb that has gained popularity in recent years through claims that it beneficially stimulates the human immune system. The increasing popularity of E. purpurea products has led to the expansion of wild crafting and commercial cultivation to meet the growing demand for plant material. Introduction of a species into cultivation requires screening plant materials suitable for local environment and an understanding of agronomic characteristics that load to high quality and yields. E. purpurea is an outcrossing crop with a high degree of heterogeneity and self-incompatibility. Recurrent selection is a straight ford selection model that can be applicable for the improvement of E. purpurea. Previous study has established three selected lines, including red (R), Blot (B) and green(G) stem population. In order to evaluate the selection efficiency, two addition cycles of phenotypic recurrent selection were conducted during 2012 to 2013, and 4 cycles offspring populations were compared in this study. The results indicated that both plant characters and total phenolics of leaf varied considerably among the selected population and generations. The distribution of all investigated parameters showed a pronounced tendency tail to the right. The plant height and flower head of blot stem and green stem population were higher than red stem population. Stem color selection is an effective index in green and red population but not in blot population after 4 cycle of mass selection. While the total phenolics of leaf , plant height and number of flowers per plant had no significant increase among different generations. Efficiency on phenotypic recurrent selection of E. purpurea need to be improved in future.
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