Plant Diversity ›› 2015, Vol. 37 ›› Issue (05): 493-512.doi: 10.7677/ynzwyj201515019

• Articles •     Next Articles

Character of Leaf Epidermis and Their Systematic Significance of Daphne and Wikstroemia (Thymelaeaceae)

 ZHANG  Yong-Ceng-1、2, SUN  Wen-Guang-1、2, GAO  Cai-Zhen-1, CAO  Wen-Juan-1, ZHANG  Yong-Hong-1**, LI  Zhi-Min-1、2   

  1. 1 School of Life Science, Yunnan Normal University, Kunming 650500, China; 2 Engineering Research Center of Sustainable
    Development and Utilization of Biomass Energy, Ministry of Education, Kunming 650500, China
  • Received:2015-01-31 Online:2015-09-25 Published:2015-04-10
  • Supported by:

    国家自然科学基金委-云南省联合基金重点项目 (U1136601);国家自然科学基金项目 (31360049; 31160045; 31460050);系统与进化植物学国家重点实验室开放项目 (LSEB201204);科技基础性工作专项

    (2013FY112100)

Abstract:

Fiftysix species (varieties) of Daphne, fortyfive species (varieties) of Wikstroemia and twelve species of outgroups from Thymelaeaceae, with ten phenotypic characters were selected, to study the leaf epidermal microfeatures by using light microscopy, Results reveal that Daphne and Wikstromia are consistent in most of leaf features. The epidermal cell are polygonal and irregular in shape. The patterns of anticlinal wall are straight, curved and U shape. The cell sizes range in 30-40μm × 10-20μm. Some species have singly hair on surface. Stomatal distribution is random, size range in 20-36μm × 17-25μm, most are broadly elliptical and narrowly elliptical, stomatal frequency are 100-250S/mm2, and the anomocytic stomatal type is dominate. It is apparently that many stomatal and epidermal features in Daphne and Wikstromia are crossed, and no distinguishable features are suitable for separating this two genera. Results from epidermal characters analysis don’t support monophyletic status of Daphne and Wikstroemia. Eriosolena should not be include in the genus Daphne as the special papillae only found in Eriosolena composita rather than in other genera of Thymeleaceae. In compare with other genera, Rhamnoneuron, Eriosolena, Stelleropsis, Daphnopsis and Edgeworthia in Thymelaeoideae, Daphne and Wikstroemia might be derived and originated latter based on the stomatal features.

Key words: Daphne, Wikstroemia, Thymelaeaceae, Leaf epidermis, Stomatal characters, Taxonomy

CLC Number: 

  • Q 944,Q 949