College of Landscape Architecture, Sichuan Agricultural University, Chengdu, Sichuan, China.
College of Agriculture, Food and Natural Resources, University of Missouri, Columbia, MO, USA.
Sci Rep. 2017 Jun 23;7(1):4192. doi: 10.1038/s41598-017-04613-9.
Fargesia Franchet emend. Yi is closely allied with Thamnocalamus Munro but differs in many major morphological characteristics. Based on traditional morphological characters, it is difficult to differentiate these two genera. The current study measured 19 species in these two genera to determine whether variations in 12 categories of major characters are continuous. In addition, a self-organizing map (SOM) and cluster analysis were used together to reveal whether the known species of Fargesia represent discontinuous sampling of Thamnocalamus. The results show that 46 morphological characteristics exhibited high variation at the generic and species levels. In addition, the cluster analysis showed that 32 morphological characteristics of Thamnocalamus and Fargesia were divided between two species and well separated from the outgroup. Additionally, significant differences (P < 0.01) were observed in the reproductive structures between these two genera. The unrooted dendrogram, which was based on the SOM neural network, shows the same results as the cluster analysis of morphological characteristics. These data indicate that Fargesia is not a result of discontinuous sampling of Thamnocalamus; thus, Fargesia should not be treated as a synonym for Thamnocalamus.
粗柄箭竹（Fargesia Franchet emend. Yi）与唐竹（Thamnocalamus Munro）密切相关，但在许多主要形态特征上存在差异。基于传统的形态学特征，很难区分这两个属。本研究测量了这两个属的 19 个物种，以确定 12 类主要特征的变异是否连续。此外，还使用自组织映射（SOM）和聚类分析一起揭示粗柄箭竹的已知物种是否代表唐竹的不连续采样。结果表明，46 种形态特征在属和种水平上表现出高度变异。此外，聚类分析表明，唐竹和粗柄箭竹的 32 种形态特征在两个物种之间分开，与外群很好地区分开来。此外，这两个属的生殖结构存在显著差异（P<0.01）。基于 SOM 神经网络的无根树状图与形态特征聚类分析的结果相同。这些数据表明，粗柄箭竹不是唐竹不连续采样的结果；因此，粗柄箭竹不应被视为唐竹的同义词。
