Chung Myong Gi, Epperson Bryan K
Department of Biology, Gyeongsang National University, Chinju, 660-701, Korea.
Department of Forestry, Michigan State University, East Lansing, Michigan, 48824.
Evolution. 1999 Aug;53(4):1068-1078. doi: 10.1111/j.1558-5646.1999.tb04522.x.
The spatial distribution of clonal versus sexual reproduction in plant populations should generally have differing effects on the levels of biparental inbreeding and the apparent selfing rate, produced via mating by proximity through limited pollen dispersal. We used allozyme loci, join-count statistics, and Moran's spatial autocorrelation statistics to separate the spatial genetic structure caused by clonal reproduction from that maintained in sexually reproduced individuals in two populations of Adenophora grandiflora, a perennial herb. Join-count statistics showed that there were statistically significant clustering of clonal genotypes within distances less than 4 m. Both the entire populations and the sets of sexually reproduced individuals exhibited significant spatial autocorrelation at less than about 12 m, and the sexually reproduced individuals are substantially structured in an isolation-by-distance manner, consistent with a neighborhood size of about 50.
植物种群中克隆繁殖与有性繁殖的空间分布，通常会对双亲近亲繁殖水平以及通过有限花粉传播近距离交配产生的表观自交率产生不同影响。我们利用等位酶位点、联邻计数统计和莫兰空间自相关统计，将克隆繁殖导致的空间遗传结构与两个多年生草本植物大花沙参种群中有性繁殖个体维持的空间遗传结构区分开来。联邻计数统计表明，在距离小于4米的范围内，克隆基因型存在统计学上显著的聚类。整个种群以及有性繁殖个体组在小于约12米的距离内均表现出显著的空间自相关，并且有性繁殖个体以距离隔离的方式呈现出显著的结构，这与约50的邻域大小一致。
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