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

doi:10.7677/ynzwyj201515019

Abstract

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

摘要：

选取瑞香科瑞香属 (Daphne) 植物56种 (变种)、荛花属 (Wikstroemia) 植物45种(变种)，及12种外类群植物，进行叶表皮微形态解剖学研究。结果表明，瑞香属和荛花属植物叶表皮细胞大多为多边形和不规则形，垂周壁大多为平直、弯曲和浅波状，大小为30~40μm × 10~20μm，部分具毛。气孔呈随机分布，大小为20~36μm × 17~25μm，宽椭圆形或窄椭圆形，气孔密度为100~250S/mm2，气孔主要类型为无规则型 (anomocytic)。瑞香属与荛花属的叶表皮性状整体具有一致性，两属间没有典型区别特征，很多性状在两个属中呈交叉分布，不反映瑞香属和荛花属分别是自然 (单系) 类群。毛管花属 (Eriosolena) 植物特有的乳突 (papillae) 特征在瑞香属和荛花属植物中均不存在，不支持将其并入瑞香属的分类处理。通过气孔器类型比较分析认为，瑞香属和荛花属与瑞香亚科中的其他属，如鼠皮树属 (Rhamnoneuron)、毛管花属、假狼毒属 (Stelleropsis)、Daphnopsis、结香属 (Edgeworthia) 相比具衍生性状，是衍生类群。

关键词: 瑞香属, 荛花属, 瑞香科, 表皮性状, 气孔性状, 分类学

CLC Number:

Q 944，Q 949

ZHANG Yong-Ceng, SUN Wen-Guang, GAO Cai-Zhen, CAO Wen-Juan, ZHANG Yong-Hong**, LI Zhi-Min. Character of Leaf Epidermis and Their Systematic Significance of Daphne and Wikstroemia (Thymelaeaceae)[J]. Plant Diversity, 2015, 37(05): 493-512.

张永增, 孙文光, 高彩珍, 曹文娟, 张永洪, 李志敏. 瑞香属和荛花属 (瑞香科) 植物叶表皮特征及其分类学意义[J]. Plant Diversity, 2015, 37(05): 493-512.

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