Seed set and gene flow patterns in an experimental population of an endangered heterostylous herb with controlled local opposite-morph density
Seed set and gene flow patterns in an experimental population of an endangered heterostylous herb with controlled local opposite-morph density
复制标题
DOI：
10.1046/j.1365-2435.2003.00773.x
复制
发表时间：
2003-10
影响因子：
5.2
通讯作者：
F. Ishihama;C. Nakano;S. Ueno;M. Ajima;Y. Tsumura;I. Washitani
中科院分区：
文献类型：
--
作者：
F. Ishihama;C. Nakano;S. Ueno;M. Ajima;Y. Tsumura;I. Washitani
摘要一种植物的种子繁殖受其种群的空间结构通过基因流模式产生强烈影响。我们利用一个斑块的实验种群，研究了遗传相容配偶的空间排列对异花柱多年生植物报春花(报春花科)的种子结实和基因流动的影响。2含有异形基因斑块的种子集显著高于不含异形基因斑块的种子集。斑块内的花粉流动占总花粉流动的76.9%，而斑块间的花粉流动占13.5%。花粉在实验种群内的平均传播距离为7.23米，最大传播距离为米。3种子平均散布距离为10.4 cm，最大散布距离为23.0 cm。4我们的结果表明斑块种群内亲和交配的空间排列对结实和基因流动有深远的影响。利用实验种群和分子标记相结合的研究将为评估空间结构对植物基因流动和繁殖的影响提供高效的手段，也将为保护工作提供有价值的信息。
Summary 1Seed reproduction of a plant species is strongly affected by the spatial structures of its population through gene flow patterns. We assessed the effects of the spatial arrangement of genetically compatible mates on the seed set and gene flow of a heterostylous perennial species, Primula sieboldii E. Morren (Primulaceae), using a patchy experimental population. 2Seed set was significantly higher in patches containing opposite-morph genets than in patches without opposite-morph genets. Pollen flow within patches explained 76·9% of total pollen flow, while 13·5% was ascribed to pollen flow between patches. Mean and maximum pollen dispersal distances within the experimental population were 7·23 and 89 m, respectively. 3Mean and maximum seed dispersal distances were 10·4 and 23·0 cm, respectively. 4Our results suggest a profound effect of the spatial arrangement of compatible mates within the patchy population on seed set and gene flow. Investigations using experimental populations in combination with molecular markers will provide highly effective means for evaluating the influences of spatial structures on plant gene flow and reproduction, and will also provide valuable information for conservation efforts.