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首页> 外文期刊>Acta Horticulturae >Cytotype variation in the natural populations of Actinidia chinensis complex in China.
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Cytotype variation in the natural populations of Actinidia chinensis complex in China.

机译：中国猕猴桃自然种群的细胞型变异。

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摘要

The Actinidia chinensis Planchon, including A. Chinensis var. chinensis and A. Chinensis var. deliciosa, is a diploid-polyploid species complex. Both varieties in this complex are commercially important. To better understand the cytotype distribution, ecological adaptation and to facilitate breeding of the two varieties, the ploidy variations in their natural populations were examined by flow cytometry in both large and small scale spatial ranges in the central-west China. In total, 338 individuals sampled from 16 natural populations in a large scale spatial range and 245 individuals continuously sampled in a small scale spatial range were included in this analysis. As a result, four ploidy levels of diploids, tetraploids, pentaploids and hexaploids were found, in which A. Chinensis var. chinensis are diploids and tetraploids, and A. Chinensis var. deliciosa are tetraploids, pentaploids and hexaploids. In the large scale spatial range, the distribution of diploids and hexaploids are geographical segregation, but the tetraploids are geographically mixed with diploids or hexaploids. Moreover, significant geographical segregation relating to altitudes and latitudes of three cytotypes has been found in the small scale spatial range focused. In both spatial scales, the total cytotype distribution shows a pattern in which the ploidy levels declined continuously as the altitudes decreased or longitudes increased. Moreover, cytotype mixture has been found to occur in many natural populations of this species complex. Possible eco-genetic mechanisms relating to cytotype mixture and the potential hybrid zone of two varieties have been discussed. All of these results are expected to provide new baseline data for the domestication and breeding of kiwifruit.
机译：中华猕猴桃 Planchon，包括 A。中国变种 chinensis 和 A。中国变种 deliciosa 是一种二倍体-多倍体物种复合体。该复合物中的两个变种在商业上都很重要。为了更好地了解细胞类型的分布，生态适应性和促进这两个品种的育种，通过流式细胞术在中西部地区的大，小尺度空间范围内研究了其自然种群的倍性变异。该分析总共包括从16个自然种群中以大尺度空间范围采样的338个人和在小规模空间范围中连续采样的245个人。结果，发现四倍体水平的二倍体，四倍体，五倍体和六倍体，其中A。中国变种 chinensis 是二倍体和四倍体，以及 A。中国变种 deliciosa 是四倍体，五倍体和六倍体。在较大的空间范围内，二倍体和六倍体的分布是地理隔离，但四倍体在地理上与二倍体或六倍体混合。此外，在关注的小范围空间范围内，发现了与三种细胞型的高度和纬度有关的重大地理隔离。在两个空间尺度上，总细胞型分布均显示出一种模式，其中倍数水平随着海拔的降低或经度的增加而连续下降。此外，已经发现在该物种复合体的许多自然种群中存在细胞型混合物。讨论了可能的生态遗传机制，涉及两种类型的细胞类型混合物和潜在的杂种区。所有这些结果有望为猕猴桃的驯化和育种提供新的基线数据。

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