Duarte-Almeida Joaquim M, Clemente Milene S, Arruda Rosani C O, Vaz Angela M S F, Salatino Antonio
Instituto de Biociências, Universidade de São Paulo, São Paulo, SP, Brasil.
Centro de Ciências Biológicas e da Saúde, Universidade Federal de Mato Grosso do Sul, Campo Grande, MS, Brasil.
An Acad Bras Cienc. 2015 Apr-Jun;87(2):787-96. doi: 10.1590/0001-3765201520140151. Epub 2015 Apr 17.
Large elongated glands occur on Cercideae leaf surfaces. Leaves of Bauhinia (55 taxa, 53 species), Cercis (1 species), Phanera (1 species), Piliostigma (2 species), Schnella (19 species) and Tylosema (1 species) were observed to determine location and relative number of glands. They were only observed on the abaxial leaf surface of 42 Bauhinia taxa. The glands were analyzed by light stereomicroscope and scanning electron microscopy. They are large (up to 270 µm long and 115 µm wide) and multicellular, containing lipophilic substances, probably volatile oils. Presence or absence and density of the glands in species of Bauhinia may be useful to determine species delimitation or distinction among infraspecific taxa. Higher density of glands is more common in species from "cerrado" (a savanna ecosystem) and "caatinga" (a semiarid ecosystem from northeast Brazil) areas. Bauhinia species devoid of foliar glands are frequently from humid forests.
在紫荆科植物的叶表面有大型的细长腺体。对羊蹄甲属（55个分类群，53个物种）、紫荆属（1个物种）、粉叶羊蹄甲属（1个物种）、象耳豆属（2个物种）、施氏豆属（19个物种）和肿荚豆属（1个物种）的叶片进行了观察，以确定腺体的位置和相对数量。仅在42个羊蹄甲属分类群的叶背面观察到了这些腺体。通过光学体视显微镜和扫描电子显微镜对这些腺体进行了分析。它们很大（长达270微米，宽达115微米）且为多细胞结构，含有亲脂性物质，可能是挥发油。羊蹄甲属物种中腺体的有无及密度可能有助于确定物种界限或种下分类群之间的差异。腺体密度较高在来自“塞拉多”（一种稀树草原生态系统）和“卡廷加”（巴西东北部的一种半干旱生态系统）地区的物种中更为常见。没有叶腺体的羊蹄甲属物种通常来自湿润森林。
