Plant Diversity ›› 2013, Vol. 35 ›› Issue (2): 109-118.DOI: 10.7677/ynzwyj201312082

• Articles •     Next Articles

Pollen Morphology of Glycosmis (Rutaceae) and Its Systematic Implications

MAO  Feng-Juan-1、4, LI  Shuang-Zhi-1, XU  Qiong-Hua-2, MA  Shi-Zhu-3, ZHANG  Dian-Xiang-4   

  1. 1 Key Laboratory for Forest Resources Conservation and Use in the Southwest Mountains of China, Ministry of Education, Southwest
    Forestry University, Kunming 650224, China; 2 Yuxi Agricultural VocationTechnical College, Yuxi 653106, China;
    3 Dali Institute of Forestry Science, Xiaguan 671000, China; 4 South China Botanical Garden,
    Chinese Academy of Sciences, Guangzhou 510650, China
  • Received:2012-05-31 Online:2013-03-25 Published:2012-06-24


 To study the systematic relationship of Glycosmis (Rutaceae), pollen morphology of 12 species and 16 samples of Glycosmis from China were studied by scanning electron microscopy (SEM). Some palynological characters, including the pollen size, the aperture number and the exine ornamentation, were observed and evaluated. Among these taxa, the pollen morphology of nine species or varieties were reported for the first time, such as G.craibii var. glabra, G.erythrocarpa, G.esquirolii, G.longifolia, G.lucida, G.montana, G.oligantha, G.parviflora and G.pseudoracemos. In all species studied, pollen grains are monads, subspheroidal or prolate in shape and the range of size is (15.90-23.92)×(14.56-22.00)μm; circular, circular with 3 lobes or subtriangle in polar view; 3colporate; P/E (the ratio of polar axis and equatorial axis) is 1.03-1.31. Among species of Glycosmis from China, there are four types, namely striatoreticulate, compound striatoreticulate, striatoperforate and foveolate, based on the characters of exine ornamentation. In G.parviflora widely distributing in south of China, the samples from different localities showed variable exine ornamentation of pollen grains, viz. (1) foveolate in polar view and striatoreticulate or perforate in equatorial view, (2) foveolate in polar view and perforate in equatorial view, (3) compound striatoreticulate, (4) striatoreticulate and with irregular microperforation, (5) striatoreticulate and with circular perforation. The genus Glycosmis exhibits very high pollen morphological diversity, which can be used in inter and intraspecific taxonomy in this genus, along with the systematic relationship among the relative genera. The results provide some valuable palynological references for the classification and systematics of Glycosmis.

Key words: Glycosmis, Pollen morphology, Rutaceae, Systematical implication

CLC Number: