open access

https://hdl.handle.net/2115/17238

Pollen morphology of Pieris D. Don (Lyonieae, Ericaceae) and its taxonomic significance

英語

taxonomic significance

2006-08

津村研究所

The Journal of Japanese Botany

81(4)

225-234

Pollen morphology of 6 species in the genus Pieris was examined using light and scanning electron microscopes. Judd’s infrageneric classification of Pieris was reexamined in the light of new palynological characters. The genus Pieris is stenopalynous in having 3-colporate and oblate pollen tetrads. However, a continuous and serial variation in the exine sculpture, tetrad diameter, polar and equatorial length of pollen and apocolpial exine thickness was revealed within the genus. Pieris nana is characterized by having the smallest pollen and the smallest rugulae in the rugulate sculpture. Considering other distinct morphological characters, we confirm the recognition of monotypic subgenus Arcterica based on this species. Within the other subgenus, Pieris, members of the sections Pieris and Phillyreoides can be distinguished by subtle differences in colpus width, septum thickness and ratio of colpus length to tetrad diameter. Pieris formosa is distinguished by its psilate exine with clear secondary striate sculpture. Pieris japonica and P. cubensis are not well differentiated in the palynological characters, and act as a bridge between sect. Pieris and sect. Phillyreoides. On the basis of palynological characters a dichotomous key of these taxa was also prepared.

学術雑誌論文

Accepted Manuscript

0022-2062