中国黄耆属糙叶组叶表皮毛状体微形态学特征  

The Leaf Micro-morphological Features of Astragalus Sect. Trachycersis Bunge from China

作　　者：黄姗 杨韩 苏春 常朝阳[1] HUANG Shan;YANG Han;SU Chun;CHANG Zhaoyang(College of Life Sciences,Northwest A＆F University,Yangling,Shaanxi 712100,China)

机构地区：[1]西北农林科技大学生命科学学院,陕西杨陵712100

出　　处：《西北植物学报》2018年第9期1646-1658,共13页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金(30870155;30270106;31300158)

摘　　要：采用体视显微镜和扫描电子显微镜,对中国产黄耆属糙叶组34种植物的叶表皮毛状体的形态特征及其分布进行了观察,以探讨中国黄耆属糙叶组物种表皮毛微观形态的变异式样及其分类学意义,为糙叶组物种的分类鉴定提供依据。结果表明:除乳白花黄耆(A.galactites)仅在叶下表面被毛外,其余种类上下表皮均有毛,且毛的分布、形态、长度和臂比在不同种类间存在差异。叶表皮毛为伏贴或开展的中空管状毛,伏贴毛着生部位基部膨大,整体形态从中部向两端由粗逐渐变细,开展的毛大部分为细长的丝状或线状,光滑或具条纹状纹饰,上面分布有乳突。研究认为,叶表皮表面伏贴、短而平直、其上光滑具密集乳突、臂比值小、整体宽扁的毛是祖先特征;而叶表皮表面向上开展、长而密集、外形呈丝状或线形、其上具条纹状纹饰、乳突稀疏、臂比值大的毛是进化特征。Based on stereomicroscopic and scanning electronic microscopic observation,we studied the hair morphology and distribution on leaf of 34 species of Astragalus Sect.Trachycersis Bunge from China in order to identify their variation pattern and taxonomic significance.The results showed that hairs are distributed on both upper and lower leaf surfaces of all studied species except for A.galactites,in which hairs are only on lower surface of leaves.The distribution,morphology,length and arm ratio of hairs are varied in different species.Haris are medifixied,hollow,appressed or spreading,densely to sparsely papillose on hair surfaces.Among them,appressed hairs are inflated on base of attachment,gradually thinner from middle to both ends,while spreading ones generally are slender filiform or linear,smooth or with striation.In our point,those appressed,short and straight,smooth with densely papillose,and with small arm ratio,flat hairs are ancestral characters,while those spreading,long and dense,filiform or linear,with striate ornamentation and sparsely papillose on surface,and with big arm ratio are advanced ones.On the basis,we discussed taxonomy of some related species in this section.

关 键 词：黄耆属糙叶组 叶表皮毛 微形态学 分类学意义 

分 类 号：Q944.56[生物学—植物学]