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Pollen Morphology in Sorbus L. (Rosaceae) and Its Taxonomic Implications.


ABSTRACT: The genus Sorbus L. in the Rosaceae family is taxonomically challenging due to its morphological variation, polyploidy, and interspecific hybridization. In this study, we used scanning electron microscopy (SEM) to observe the pollen morphology of eighty species, representing six subgenera, in order to assess the differences within the genus Sorbus and its pollen characteristics. We conducted a cluster analysis on three qualitative and four quantitative characteristics. The results demonstrated that the pollen grains of the studied Sorbus species are isopolar and tricolporate. We identified five types of pollen shapes: suboblate, spheroidal, subprolate, prolate, and perprolate. The pollen ornamentation of the investigated species could be classified into five types: striate-perforate, striate, cerebroid-perforate, cerebroid, and foveolate. Interestingly, within the same subgenera, different species exhibited multiple types of characters. The cluster analysis indicated that all 80 species could be divided into six groups, with group B consisting exclusively of species from the subgenus Sorbus. Although pollen micro-morphologies alone do not provide sufficient evidence to establish the taxonomic relationships of the subgenera within Sorbus, they do offer valuable information for species-level taxonomic treatment.

SUBMITTER: Li M 

PROVIDER: S-EPMC10534392 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature

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Pollen Morphology in <i>Sorbus</i> L. (Rosaceae) and Its Taxonomic Implications.

Li Meng M   Tian Chang-Fen CF   Idrees Muhammad M   Pathak Mitra M   Xiong Xian-Hua XH   Gao Xin-Fen XF   Wang Xian-Rong XR  

Plants (Basel, Switzerland) 20230920 18


The genus <i>Sorbus</i> L. in the Rosaceae family is taxonomically challenging due to its morphological variation, polyploidy, and interspecific hybridization. In this study, we used scanning electron microscopy (SEM) to observe the pollen morphology of eighty species, representing six subgenera, in order to assess the differences within the genus <i>Sorbus</i> and its pollen characteristics. We conducted a cluster analysis on three qualitative and four quantitative characteristics. The results  ...[more]

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