Clonal diversity, genetic structure, and mode of recruitment in a Prunus ssiori population established after volcanic eruptions
Clonal diversity, genetic structure, and mode of recruitment in a Prunus ssiori population established after volcanic eruptions
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火山喷发后建立的 Prunus ssiori 种群的克隆多样性、遗传结构和招募模式
DOI：
10.1023/b:vege.0000046054.87587.8b
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发表时间：
2004
期刊：
影响因子：
1.7
通讯作者：
H. Tanouchi
中科院分区：
文献类型：
--
作者：
T. Nagamitsu;Mifuyu Ogawa;K. Ishida;H. Tanouchi
在火山森林砍伐后，对李树种群中的幼苗和根芽的补充进行了检查。 2000年，根据5个微卫星（SSR）位点的基因型，在2.3公顷小区的188个胸径≥5 cm的分株中鉴定出44个基因，这些基因形成了相互排斥的斑块。由于 SSR 基因座中只有一个重复变化将 5 个基因与相邻基因区分开来，因此这 5 个基因有可能源自体细胞突变和有性生殖。因此，至少 39 个基因源自幼苗，至少 144 个分株源自根芽。这些树苗是在 1739 年火山爆发后和 1972 年之前进行的，因为根据年轮估算，胸径 5 厘米的树木的树龄为 28 年。由于从根芽中招募的最大分株估计有 94 岁，根芽招募是在 1739 年至 1906 年间开始的。因此，从幼苗和根芽中招募的估计最低比率分别为 0.167 y–1 和 0.618-2.182 y–1。 P的克隆多样性。 ssioripopulation (Simpson'sD= 0.92) 高于其他克隆植物群体。近交系数显着为负（Wright'sFIS= -0.069）。这些结果表明，近交系统中频繁的幼苗招募维持了种群的克隆多样性。
Seedling and root sprout recruitment after a volcanic deforestation was examined in aPrunus ssioripopulation. According to genotypes of five microsatellite (SSR) loci, 44 genets were identified among 188 ramets ≥ 5 cm DBH in a 2.3-ha plot in 2000. The genets formed mutually exclusive patches. Because only one repeat change in an SSR locus distinguished five genets from adjacent genets, there is a possibility that the five genets derived from somatic mutations as well as sexual reproduction. Thus, at least 39 genets originated from seedlings, and at least 144 ramets derived from root sprouts. The seedlings were recruited after the volcanic eruptions in 1739 and before 1972 because trees of 5 cm DBH were 28 years of age, estimated from annual rings. As the largest ramet recruited from a root sprout was estimated to be 94 years old, root sprout recruitment began between 1739 and 1906. Thus, the estimated minimum rates of recruitment from seedlings and root sprouts were 0.167 y–1and 0.618-2.182 y–1, respectively. The clonal diversity of theP. ssioripopulation (Simpson'sD= 0.92) was higher than that of other clonal plant populations. The inbreeding coefficient was significantly negative (Wright'sFIS= −0.069). These results suggest that the frequent seedling recruitment in an outbreeding system maintains the clonal diversity in the population.