Morphological Variation and ITS Sequence Analysis of the Indigofera szechuensis Complex
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摘要: 四川木蓝复合群(Indigofera szechuensis complex)为豆科木蓝属植物,共包含四川木蓝等9个种。本研究以四川木蓝复合群9个种的31个居群为材料进行形态特征变异及其ITS序列分析,结果表明:四川木蓝复合群9个种的形态性状差异主要集中在叶片大小及花序长短上;主成分分析显示,最大叶长、叶片毛被、花药毛被、小叶长宽比是种间主要形态特征差异;ITS序列分析显示,除滇木蓝外,四川木蓝复合群其余8个种的ITS序列差异较小且难以区分,因此四川木蓝复合群的这8个种可能是一个正处于分化过程中的类群,横断山区多样化的生境及复杂的地质历史可能是促使其分化的主要原因。Abstract: The Indigofera szechuensis complex contains nine species: I. szechuensis, I. pendula, I. hancockii, I. franchetii, I. delavayi, I. lenticellata, I. rigioclada, I. calcicola and I. heterantha. In this study, we conducted morphological and ITS variation analyses of 240 samples from 31 populations. Analysis of means showed that the nine species of the I. szechuensis complex mainly differed in leaflet size and inflorescence length. Principal component analysis indicated that the maximal leaf length, leaflet trichomes, anther trichomes and leaflet length to width ratio were the main interspecific morphological differences. Phylogenetic analysis based on ITS sequences indicated that interspecific relationships within the I. szechuensis complex were not resolved, except for I. delavayi. We concluded that these eight species of the I. szechuensis complex might be undergoing species differentiation caused by the complex habitats and geological history of the Hengduan Mountain region.
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