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pollen morphology of Tundra Shrubs and Submarginal Plants from Barrow, Alaska

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Journal of Integrative Plant Biology 2006年第7期48卷 756-766页

作者： Ling-Yu Tang Xiao-Ping Zhang Jian-Wen Shao Zhong-Ze Zhou Qing-Song Zhang State Key Laboratory of Paleontology and Stratigraphy Nanjing Institute of Geology and Palaeontology the Chinese Academy of Sciences Nanjing 210008 China The Cold and Arid Regions Environmental and Engineering Research Institute the Chinese Academy of Sciences Lanzhou 730000 China College of Life Sciences Anhui Normal University Wuhu 241000 China College of Life Sciences Anhui University Hefei 230000 China Institute of Geographic and Natural Resources Research the Chinese Academy of Sciences Beijing 100101 China

Investigation of plant morphological features, pollen, and habitat have been made for two shrub species from Barrow, Alaska, namely Dryas integrifoila M. Vahl and Salix rotundifolia Trautv., both of which are endemic to the Arctic floristic area. The former species has small lanceolate or plate leaves, whereas the latter has rounded leaves with distinct veins, rich in vitamin C. Both have dwarf and sprawling habits. pollen studies showed that the pollen grains of the two species are spheroidal to sub-spheroidal or prolate. The type of aperture was tricolporate; pollen size 26.3-31.3 μm; ornamentation finely reticulate under a light microscope （LM） and strlate-reticulate under a scanning electron microscope （SEM） for D. integrafoila and finely reticulate under the LM and SEM for S. rotundifolia. Comparisons were made between the pollen from the same species from Arctic collections with those from China and Japan. Investigation of pollen morphology of tundra plants can provide significant data for comparative studies of fossil pollen and for the reconstruction of paleovegetation and paleoclimate in the Barrow area.

关键词： Barrow, Alaska Dryas integrifolia pollen morphology Salix rotundifolia.

pollen morphology of the Platycodonoid Group (Campanulaceae ***.) and Its Systematic Implications

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Journal of Integrative Plant Biology 2012年第10期54卷 773-789页

作者： HONG De-Yuan PAN Kai-Yu State Key Laboratory of Systematic&Evolutionary Botany Institute of BotanyThe Chinese Academy of SciencesChina

In this study, we examined the pollen morphology of the platycodonoid group in Campanulaceae s. str. using a scanning electronic microscope. We used pollen grains of 25 accessions representing 24 species of the Codonopsis complex （including Campanumoea, Cyclocodon, Leptocodon, and all three subgenera of Codonopsis）, which is extremely controversial among authors for taxonomic treatment. pollen morphology of all the other genera in the group observed by previous authors is taken into account in our discussion. A total of nine pollen types with two subtypes in the group were recognized and named for the first time. Molecular and morphological data imply that each pollen type corresponds to a natural group at generic level, and thus the mergence of Leptocodon with Codonopsis and the restoration of Cyclocodon as a separate genus are justifiable, and Codonopsis subg. Pseudocodonopsis, subg. Obconicicapsula, and two species of Codonopsis subg. Codonopsis （C. purpurea and C. chimiliensis） may be better classified as three independent genera separate from the core Codonopsis.

关键词： Campanulaceae s. str. platycodonoid group Codonopsis complex pollen morphology pollen type taxonomy systematics.

pollen morphology of Parnassia L. （Parnassiaceae） and Its Systematic Implications

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Journal of Integrative Plant Biology 2005年第1期47卷 2-12页

作者： DingWU HongWANG De-ZhuLI StephenBLACKMORE LaboratoryofBiodiversityandPlantBiogeography KunmingInstituteofBotanytheChineseAcademyofSciencesKunming650204China RoyalBotanicGardenEdinburgh 20AInverleithRowEdinburghEH35LRScotlandUK

: The pollen morphology of 28 species of Parnassia L. was investigated with light microscopy and scanning electron microscopy (SEM). The shape of pollen grains in this genus varies from subspheroidal to prolate in equatorial view and is three-lobed circular in the polar view. pollen grains are usually radially symmetrical, isopolar, tricolporate or syntricolporate, with reticulate sculpture. The pollen characteristics among species are fairly similar to each other. Morphological information regarding the pollen grains shows that Parnassia is a natural genus. Based on exine ornamentation observed under SEM, three types of pollen grains were recognized: (i) type I, with foveolate-reticulate sculpture; (ii) type II, with a finely reticulate sculpture; and (iii) type III, with a coarsely reticulate sculpture. Most sections of this genus have one type of sculpture of pollen morphology, but Sect. Nectarotrilobos has three types of sculpture and Sect. Saxifragastrum has two types of sculpture. All three types of sculpture can be found in Southwest China, with species with the longest (Parnassia delavayi Franch.) and shortest (Parnassia faberi Oliv.) colpi, implying that Southwest China is the center of diversification of the genus.

关键词： Parnassia L. pollen morphology systematic implications

pollen morphology of the genus Cornukaempferia (Zingiberaceae) in Thailand

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Journal of Systematics and Evolution 2009年第2期47卷 139-143页

作者： Piyaporn SAENSOUK Pranom CHANTARANOTHAI Piyada THEERAKULPISUT Applied Taxonomic Research Center Department of BiologyFaculty of ScienceKhon Kaen University

Cornukaempferia is a recently described genus of Zingiberaceae which only occurs in Thailand as a rare genus with limited geographical *** three species have been described so far,including a recently described new species,*** three species are morphologically very similar and additional data on other biological aspects are useful for the elucidation of their *** morphology of all three species of genus Cornukaempferia has been studied by light microscopy and scanning electron *** pollen grains are monad,spherical,*** exine sculpture is echinate with psilate between the spines for *** and ***,or echinate with regulate between the spines for *** obser-vation helps support the taxonomic status of ***.

关键词： Cornukaempferia Zingiberaceae pollen morphology exine

pollen morphology of Pedicularis ***,a Group Endemic to the Eastern Himalaya-Hengduan Mountains Region

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Journal of Integrative Plant Biology 2008年第2期50卷 244-252页

作者： Wen-Bin Yu Hong Wang Key Laboratory of Biodiversity and Biogeography Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

Pedicularis sect. Cyathophora is a distinctive group endemic to the eastern Himalaya-Hengduan Mountains region. It was regarded as a ＇grex＇ or section and included all four general corolla types of Pedicularis. A unique feature of it is that the leaf and bract bases are fused together to form a cup-like structure around the stem at each node. pollen morphology of seven species in sect. Cyathophora was investigated by scanning electron microscopy （SEM） and light microscopy （LM）. Two different pollen apertures could be distinguished （i.e. trisyncolpate and bisyncolpate） using LM, while examination with SEM made it possible to recognize three types of exine ornamentation （i.e. microscabrate, microfoveolate and microreticulate）. The microfoveolate exine ornamentation was found in trisyncolpate pollen grains for the first time. Possible relationships between pollen data and the corolla types were discussed. Comparisons of floral and phyllotaxy characters of the genus Pedicularis, together with the pollen characters of sect. Cyathophora, could help us to better understand the evolutionary trends in Pedicularis.

关键词： eastern Himalaya Hengduan Mountains Pedicualns pollen morphology sect. Cyathophora.

pollen morphology of Artemisia L. and Its Systematic Significance

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Wuhan University Journal of Natural Sciences 2005年第2期10卷 448-454页

作者： JIANGLin WANGQin YELiu-zhong LINYou-run ZhongkaiAgroteehnicalCollege.Guangzhou510225 GuangdongChina／／SchoolofPharmaceuticalSciencesSunYat-senUniversityGuangzhou510080GuangdongChina ZhongkaiAgroteehnicalCollege.Guangzhou510225 GuangdongChina GuangzhouUniversityofTraditionalChineseMedicine Guangzhou510105GuangdongChina SouthChinaInstituteofBotany.ChineseAcademyofSciences Guangzhou510650GuangdongChina

The pollen of 57 species representing 7 sections ofArtemisia was examined by light microscope and scanning microscope for the purpose to elucidate the systematic relationships of the genus. The examination indicates that the pollen grains present high concordance which is characterized by the globular or the approximate shape, 3-lobed circular from polar view while granular or ellipse sphere from tropical plate with tricolporate structure. The exine of pollen has an obvious double structure of inner and outer layers (including the tectum and columnar layers) where the outer is thicker than the inner and the sculpture of exine degenerates into small spinules easily distinguishable from other genera of the Compositae. Based on exine sculpture. the pollen grains ofArtemisia can be divided into two types: Myriantha type and Mongolica type, which possesses 4 subtypes according to the distribution forms of spinule: (1) Sacrorum subtype, (2) Oligocarpa subtype, (3) Lavandulaefolia subtype, (4) Anomale subtype.

关键词： Artenisia Compositae pollen morphology systematic significance

Comparative pollen morphology of Glechoma and Marmoritis(Nepetinae,Lamiaceae)

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Journal of Systematics and Evolution 2010年第6期48卷 464-473页

作者： Tae-Soo JANG Suk-Pyo HONG Laboratory of Plant Systematics Department of BiologyInstitute of Basic SciencesKyung Hee University

The pollen morphology of 13 taxa(34 specimens) of the genera Glechoma L.,and Marmoritis *** investigated in detail using light,scanning electron,and transmission electron *** grains of all studied taxa are small to large in size(P = 32.5-60.4 μm,E = 20.2-50.5 μm),prolate-spheroidal to prolate in shape and mostly hexacolpate(the amb more or less circular or rarely ellipsoid) with granular *** sexine ornamentation of Glechoma is bireticulate;the muri of the primary reticulum are irregularly circled,and lumen size is *** contrast,the sexine surfaces of the Marmoritis pollen tend to more elongate or wider at the muri of the primary reticulum than those of the *** pollen wall stratification of selected taxa(three from Glechoma and one from Marmoritis) is characterized by unbranched columellae,and continuous or distinctly discontinuous endexine based on transmission electron microscopy *** results of Glechoma and Marmoritis reveal rather similar pollen morphological features,however,fine details of sexine ornamentation are characteristic to differentiate the pollen *** these differences may be useful in establishing the taxonomic boundary between two genera,they are too weak to segregate diagnostic characters.

关键词： Glechoma Lamiaceae Marmoritis Nepetinae pollen morphology scanning electron microscope sexine ornamentation transmission electron microscope.

pollen morphology in Saxifraga(Saxifragaceae) from Ny-Alesund, Svalbard, Arctic, and its taxonomic significance

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Advances in Polar Science 2014年第2期25卷 105-112页

作者： YAO Yifeng Bera Subir Ferguson David Kay LI Chengsen State Key Laboratory of Systematic and Evolutionary Botany Institute of Botany Chinese Academy of Sciences Department of Botany University of Calcutta Department of Paleontology University of Vienna

pollen morphology of eight species of Saxifraga, i.e.S, cespitosa, S. oppositifolia, S. cernua, S. nivalis, S. aizoides, S. rivularis, S. hieraciifolia, and S. hirculus, collected from Ny-Alesund, Svalbard, Arctic was examined using light and scanning electron microscopy. pollen grains of Saxifraga species are subprolate or prolate, 3-colpate, 15.4-44.4 μm in the polar axis, 11.4 34.6 μm in the equatorial axis, and show a P/E ratio 1.19-1.40. On the basis of exine ornamentation, four pollen types, viz., the S. oppositifolia type （striate without scabrae on the muff）, S. cernua type （striate with scabrae on the muri）, S. nivalis type （microreticulate and operculum absent）, and S. cespitosa type （microechinate and operculum present）, were recognized. Hierarchical cluster analysis of the pollen morphological characters indicated that pollen morphology supports the infrageneric classification of the genus Saxifraga.

关键词： Arctic Ny-Alesund pollen morphology Saxifraga Svalbard

pollen morphology of selected tundra plants from the highArctic of Ny-lesund, Svalbard

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Advances in Polar Science 2012年第2期23卷 103-115页

作者： YAO Yifeng ZHAO Qi BERA Subir LI Xiaoli LI Chengsen State Key Laboratory of Systematic and Evolutionary Botany Institute of BotanyChinese Academy of SciencesBeijing 100093China College of Life Science Capital Normal UniversityBeijing 100037China Department of Botany University of CalcuttaKolkata 700019India Beijing Museum of Natural History Beijing 100050China

Documenting morphological features of modem pollen is fundamental for the identification of fossil pollen, which will assist researchers to reconstruct the vegetation and climate of a particular geologic period. This paper presents the pollen morphol- ogy of 20 species of tundra plants from the high Arctic of Ny-Alesund, Svalbard, using light and scanning electron microscopy. The plants used in this study belong to 12 families： Brassicaceae, Caryophyllaceae, Cyperaceae, Ericaceae, Juncaceae, Papav- eraceae, Poaceae, Polygonaceae, Ranunculaceae, Rosaceae, Salicaceae, and Scrophulariaceae. pollen grain shapes included： spher- oidal, subprolate, and prolate. Variable apertural patterns ranged from 2-syncolpate, 3-colpate, 3-（-4）-colpate, 3-（-5）-colpate, 3-colporate, 5-poroid, ulcerate, ulcus to pantoporate. Exine ornamentations comprised psilate, striate-perforate, reticulate, mi- croechinate, microechinate-perforate, scabrate, granulate, and granulate-perforate. This study provided a useful reference for com- parative studies of fossil pollen and for the reconstruction of paleovegetation and paleoclimate in Svalbard region of Arctic.

关键词： Arctic Ny-A lesund pollen morphology Svalbard tundra plants