J Syst Evol ›› 2009, Vol. 47 ›› Issue (2): 123-138.DOI: 10.1111/j.1759-6831.2009.00011.x

• Research Articles • Previous Articles     Next Articles

Pollen morphology of Rhododendron subgen. Tsutsusi and its systematic implications

Yue-Jiao ZHANG 1,2 Xiao-Feng JIN*1 Bing-Yang DING*3 Jing-Ping ZHU 4   

  1. Yue-Jiao ZHANG 1,2 Xiao-Feng JIN*1 Bing-Yang DING*3 Jing-Ping ZHU 4 1 ( School of Life & Environment Sciences, Hangzhou Normal University, Hangzhou 310036, China )
    2 ( College of Life Sciences, Zhejiang University, Hangzhou 310012, China )
    3 ( School of Life & Environment Sciences, Wenzhou University, Wenzhou 325027, China )
    4 ( Center of Analysis & Measurement, Zhejiang University, Hangzhou 310028, China ) *Author for correspondence. E-mail: ; .
  • Received:2008-06-05 Published:2009-04-02

Abstract: Eighty-four pollen samples were obtained for 80 taxa, of which, 13 species and one variety are from sect. Brachycalyx Sweet, 58 species and two varieties from sect. Tsutsusi Sweet, and six species from subgen. Pentanthera (G. Don) Pojarkova, respectively. Pollen morphology of all samples was observed using LM and SEM. Pollen grains are revealed to be spheroidal and tetrahedral with tricolporate apertures. Pollen sizes of subgen. Tsutsusi (Sweet) Pojarkova range from 37.67 μm to 61.06 μm, and the exine sculptures are more or less compactly granulated. Pollen sizes are significantly different between sect. Brachycalyx and sect. Tsutsusi of subgen. Tsutsusi. Rhododendron tashiroi Maxim. of sect. Tsusiopsis Sleumer shows a close affinity to sect. Brachycalyx. Pollen size and exine are consistent with general morphology in differentiating species in sect. Tsutsusi. Rhododendron huadingense B. Y. Ding & Y. Y. Fang, once placed as a member of sect. Brachycalyx, should be considered as a species in subgen. Pentanthera.

Key words: Ericaceae, Rhododendron subgen. Tsutsusi, pollen morphology, tetrahedral tetrads, systematic implication