Pollen morphology of the genus Sophora (Fabaceae) and its taxonomic implications
Pollen morphology of the genus Sophora (Fabaceae) and its taxonomic implications
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DOI：
10.1002/jemt.24034
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发表时间：
2021-12-23
影响因子：
2.5
通讯作者：
Gao, Xin-Fen
中科院分区：
文献类型：
--
作者：
Liao, Min;Ullah, Fazal;Gao, Xin-Fen
槐属（豆科）是分类学上具有挑战性的属之一，具有很高的经济和医学价值。本研究利用扫描电镜对槐属27个种、4个亚种、4个变种以及3个近缘属的43个样品的花粉形态进行了扫描电镜观察，以评价该属的花粉多样性及其分类学意义。研究物种的花粉粒为三孔形（很少有六孔），花粉形状从近扁形、球形、近扁形到扁长形不等。首次报道了该属某些物种的海胆外部装饰。在该属中首次描述了极地/赤道视图中的孔径膜装饰和轮廓。主成分分析用于了解种属之间的关系和区别，其中6个成分占总方差的79.92%。还构建了基于花粉形态的分类键，以便通过孢粉学特征轻松识别该属的分类单元。结果表明，仅花粉形态不足以阐明或重建槐属内的分类关系，但孢粉学评估可以为识别分类学上有问题的类群提供一些有用的信息。
The genus Sophora (Fabaceae) is one of the taxonomically challenging genera with high economic and medical values. In this study, the pollen morphology of 43 samples of 27 species, 4 subspecies, and 4 varieties of the genus Sophora and 3 closely related genera was examined using scanning electron microscopy to evaluate the pollen diversity of the genus and its taxonomic significance. Pollen grains of the studied species were tricolporate (rarely six-aperture), and pollen shape varied from suboblate, spheroidal, subprolate to prolate. Echinate external ornamentation was reported for the first time in some species of the genus. Aperture membrane ornamentation and outline in a polar/equatorial view were described for the first time in the genus. Principal component analysis was used to understand the relationship and discrimination between the species and the genera, with six components accounting for 79.92% of the total variance. Taxonomic keys based on pollen morphology were also constructed to easily identify the taxa of the genus through palynological characteristics. Results showed that pollen morphology alone is not sufficient to elucidate or reconstruct taxonomic relationships within the genus Sophora, but palynological assessments can provide some useful information for identifying taxonomically problematic taxa.