广西植物Issue(1)：83-95,13.DOI:10.11931/guihaia.gxzw20160117S
凤仙花属总状花序组的花粉形态及其分类学意义
Taxonomic significance of the pollen morphology of sect.Racemosae(Impatiens)
摘要
Abstract
Section ofRacemosaeHook. f. et Thomson, blonging to subg.Impatiens,Impatiens, Balsaminaceae, most of them distributed in South China and with a part of species radiated to southern slope of Himalaya and Europe. The species of this section are characterized by racemose inflorescences with many flowers, 2 lateral sepals, 5-carpellated ovary, linear capsule fruits with multiple seeds, subobovoid, and surface of seed with finger-like protuberance appendages, which well circumscribe this section from others ofImpatiens. Pollen studies in previous works indicated that morphological characters of pollen grains were of valuable in subdivision ofImpatiens and circumscription ofImpatiens species. However, the species carried out pollen studies in sect.Racemosae are few concerned. In order to study the pollen grain characters and clarify their taxonomic significance of pollen morphology characters, 21 species from sect.Racemosae were sampled and investigated under Scanning Electron Microscope in this study. The observation results indicated that the species of sect.Racemosae were characteristic of 4-colpate pollen grain, zygomorphic, and oblong, long-oblong or sub-quadrate in polar view. The long equatorial view of pollen grain were elliptic to oblong, short equatorial view of pollen grains were elliptic; and the ratio of length of long equatorial axis to short one were mostly between 1.4-2.4. The exine of pollen grains were of reticulate ornamentation with lumina even in polar view or uneven equatorial view. The muri of lumen were smooth or sinuate towards margin. There were granules in the lumina with different densities. The pollen morphology characters of sect.Racemosae showed little correlation with the gross morphological characters within this section. However, variation in the aspects of pollen shapes in polar view, the ratio between long equatorial axis and short equatorial axis, distribution of lumen, muri of lumen smooth or sinuate and the density of granules in the lumina and so on, were consensus within species expressed the taxonomical value in circumscription of species within sect.Racemosae.关键词
凤仙花科/凤仙花属/总状花序组/花粉形态/分类学/扫描电镜Key words
Balsaminaceae/Impatiens/sect.Racemosae/pollen morphology/systematics/SEM分类
农业科技引用本文复制引用
郭慧,闫瑞亚,张梅,罗强,张林静,于胜祥..凤仙花属总状花序组的花粉形态及其分类学意义[J].广西植物,2016,(1):83-95,13.基金项目
国家自然科学基金（31170177）[Supported by the National Natural Science Foundation of China（31170177）]。 （）
