色季拉山 10 种报春花属植物花粉形态及其分类学意义

Subjects: Biology >> Botany >> Applied botany submitted time 2022-06-07 Cooperative journals: 《广西植物》

刘林 张良英 程贵兰 何丹 张力飞 孟凡丽

Abstract： Primula is an important genus of Primulaceae, which has high ornamental value because of diverse flower colors and long flowering period. In order to provide palynology basis for the taxonomy of this genus, we observed and compared the pollen morphological characteristics of 10 Primula species from the Sygera Mountains in Tibet by scanning electron microscopy(SEM). Moreover, clustering analysis was carried out on the basis of these characteristics of pollen morphology. The results were as follows: (1) Pollen shapes of 10 Primula species varied from oblate to nearly spherical. Among these species, the pollen of P. calderiana was the biggest, and the smallest was that of P. kongboensis. The germinal aperture of P. tibetica was stephanocolpate type. The other pollens usually were tricolporate type, most of the colpus converged to form parasynocolpus in the polar region. (2) The pollen exine ornamentation were mostly foveolate or reticulate, which of P. chungensis and P. tibetica were coarsely reticulate. (3) In traditional classification, 10 species belong to 7 sections respectively. Clustering analysis based on pollen characteristics showed a certain level of consistency with the traditional classification. However, P. tibetica and P. kongboensis, both belonging to Sect. Aleuritia, maintained a relatively distant relationship due to their obvious differences in pollen traits. The preliminary results show that there are interspecific differences in the pollen morphology of 10 Primula species, which can provide a certain degree of reference for classification of plants. But it should be reminded that in addition to pollen characteristics, morphology and molecular biology still need to be comprehensively considered in classification.

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