New insights into pollen morphology and its implications in the phylogeny of Sanguisorba L. (Rosaceae; Sanguisorbeae) |
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Authors: | Sangtae Lee Kyoung-in Heo Juhee Cho Chunghee Lee Wenli Chen Seung-Chul Kim |
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Affiliation: | 1. Department of Biological Sciences, Sungkyunkwan University, Suwon, 440-746, South Korea 2. Korean National Arboretum, 51-7 Jikdongni, Soheur-eup, Pocheon-si, Gyeonggi Province, 487-821, South Korea 3. Institute of Botany, Chinese Academy of Sciences, Beijing, People??s Republic of China
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Abstract: | Pollen morphology of 13 species of the genus Sanguisorba (Rosaceae) was examined by light and scanning electron microscopy. The pollen morphology divided the genus into two main groups: (A) tricolporate with tapered colpus tips, and (B) either tricolporate with opened colpus tip or hexacolporate. The former group was further subdivided into those without vestibulum (A1: S.?alpina, S.?dodecandra, and S.?filiformis) and those with vestibulum (A2: S.?agrimonoides, S.?ancestroides, S.?annua, S.?cretica, S.?minor, and S.?verrucosa), whereas the latter group was subdivided into those with colpus narrow and similar to the A1 type (B1: S.?canadensis and S.?diandra), those with colpus and mesocolpus somewhat equally wide and forming hexacolporate aperture (B3: S.?albiflora, S.?armena, S.?media, S.?menziesii, S.?parviflora, S.?stipulata, and S.?tenuifolia), and those with colpus intermediate between the B1 and B3 types (B2: S.?hakusanensis, S.?microcephala, S.?obtusa, S.?officinalis, S.?polygama, and S.?sitchensis). It is suggested that the A1 type aperture would have evolved to the A2 type as a specialized form and the B types (B1 to B3) in a direction in which the hexacolporate aperture was derived. Implications of pollen morphology for infrageneric classification of Sanguisorba are discussed and the results are compared with molecular phylogenetic studies. |
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