Altitude difference might contribute to the genetic divergence of giant panda' staple food Bamboo (Fargesia spathacea complex) based on 14 SSR markers

The taxonomy in woody bamboo faces a lot of difficulties due to its long blooming intervals and complicated morphological variation. Whether the current taxonomy would reflect the genuine species divergence within woody bamboo is an intriguing question. Fargesia spathacea complex comprises fifteen closely related species with sympatric distribution in China. Their classification has long been controversy because of only a handful of vegetative traits available, thus providing a good opportunity to explore the evolutionary relationship and genetic differentiation in woody bamboo. Here we presented a study with 750 individuals from 39 representative populations in Fargesia spathacea complex using 14 SSR markers. We found varying degrees of genetic diversity across populations of the Fargesia spathacea complex (He=0.07-0.81) and largely negative F values at the population level, implying an excess of heterozygotes in the populations. Phylogenetic analyses revealed that all populations were...木本竹类的分类学研究面临诸多困境，究其原因在于其开花间隔漫长且形态变异复杂。当前的分类体系能否如实反映木本竹类真实的物种分化情况，是一个颇具研究价值的科学问题。箭竹属（Fargesia spathacea）复合群包含15个亲缘关系紧密的物种，在我国呈同域分布。由于仅能获取少量营养性状，其分类地位长期存在争议，因此该类群为探究木本竹类的演化关系与遗传分化提供了绝佳的研究契机。本研究针对该复合群的39个代表性种群共750个个体，采用14个简单序列重复（SSR, Simple Sequence Repeat）标记开展分析。结果显示，箭竹属（Fargesia spathacea）复合群各群体的遗传多样性水平存在显著差异（期望杂合度He=0.07~0.81），且群体水平的F值整体为负值，表明群体内存在杂合子过剩现象。系统发育分析表明，所有种群均……