Subjects: Biology >> Botany >> Applied botany submitted time 2021-12-19 Cooperative journals: 《广西植物》
Abstract： Sect. Chrysanthae have high ornamental value, but their classifications are controversial. In order to study the morphological characteristics and taxonomic significance of pollen in sect. Chrysanthae, we observed morphological shape, exine ornamentations and perforation characteristics of 10 species of sect. Chrysanthae pollen grains by scanning electron microscope, and the polar axis, equatorial axis and germination ditch length were analyzed by cluster. The results were as follows: (1) The pollen of sect. Chrysanthae was single, medium size and most of them were subspherical, only C. indochinensis var. tunghinensis was oblate sphere and C. impressinervis was prolate; The extine ornamentation of pollen could be broadly divided into three types: ornate, verrucate and tuberculate-baculate, and the size and density of various surface perforation were obviously different. (2) Cluster analysis showed that the pollen morphology of C. perpetua, C. petelotii var. grandiflora, C. petelotii and C. euphlebia were proximity ; C. flavida, C. micrantha and C. indochinensis var. Tunghinensis had similar characteristics. However, C. pubipetala and C. impressinervisare were clearly different from the others. The extine ornamentation and perforation of pollen were different, but it was still necessary to combine the polar axis, equatorial axis and the length of germination groove to clearly distinguish the 10 species of sect. Chrysanthae. From the perspective of palynology, the pollen of sect. Chrysanthae has the general characteristics of Camellia without specificity, and this group of plants may not be an independent group, but the pollen morphology of this group of plants has obvious inter-specific differences, which can be used as the basis for taxonomy. The results of this study provide the basis for the taxonomic status among species of Camellia.
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