Population genetic structure of Yushania niitakayamensis (Bambusoideae, Poaceae) in Taiwan
Population genetic structure of Yushania niitakayamensis (Bambusoideae, Poaceae) in Taiwan
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DOI：
10.1111/j.1365-294x.1994.tb00053.x
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发表时间：
1994-06
影响因子：
4.9
通讯作者：
J. Hsiao;L. Rieseberg
中科院分区：
文献类型：
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作者：
J. Hsiao;L. Rieseberg
玉山竹分布于台湾、中国西南部和菲律宾北方。在台湾，该物种分布于海拔1500至3500米的中央山脉。形态变化，特别是在植物高度方面，是大的，植物高度从10厘米到5米不等。该物种似乎主要通过根茎和花传播很少，导致预测，大多数人口是由一个单一的或几个克隆基因型和观察到的形态变异主要是由于表型可塑性。摘要本研究旨在探讨合欢山地区本种的遗传结构。在同一地点调查了10个来自单一无性系的植株和10个遗传背景未知的植株，以筛选用于无性系鉴定的RAPD引物。在第二个研究中心，在整个种群的50 m横断面上以1 m的间隔采集植物。样带一端（裸露部分）的植物高度约为15 - 30 cm，而在样带另一端的阴影处发现了高达410 cm的植物。12个引物的扩增谱的比较显示，在我们的遗传均匀性的预测相反，许多样品具有可重复不同的RAPD扩增谱，与51个样品代表31个克隆。这些数据意味着克隆体的大小相对较小，种群实际上在遗传上高度多样化。该种群的遗传变异可能是由于该物种进化史上较高的有性生殖频率和/或玉山竹无性系中较高的RAPD位点体细胞突变率所致。
Yushania niitakayamensis is distributed in Taiwan, south‐west China and northern Philippines. In Taiwan, the species occurs in the central mountain ranges from 1500 to 3500 m in altitude. Morphological variation, especially in terms of plant height, is large, with plants ranging from 10 cm to 5 m in height. The species appears to spread mainly by rhizomes and flowers rarely, leading to the prediction that most populations are comprised of a single or a few clonal genotypes and that the observed morphological variation is primarily due to phenotypic plasticity. The purpose of the present study was to investigate the genetic structure of this species on Mt Hohuan in central Taiwan. Ten plants from a single clone and ten plants of unknown genetic background were surveyed at one site in order to select RAPD primers useful for clone identification. Plants at a second site were collected at 1‐m intervals across a 50‐m transect through the population. Plants at one extreme (exposed portion) of the transect were approximately 15–30 cm in height, whereas plants up to 410 cm in height were found at the other shaded end of the transect. Comparison of amplification profiles for 12 primers revealed that in contrast to our predictions of genetic uniformity, many samples had reproducibly different RAPD amplification profiles, with the 51 samples representing 31 clones. These data imply that the clone size is relatively small, and the population is actually highly diverse genetically. The genetic variation in this population may be due to a higher frequency of sexual reproduction during the evolutionary history of the species and/or a high somatic mutation rate for RAPD loci in clones of Yushania.