Paiva Elder Antônio Sousa, Machado Sílvia Rodrigues
Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Departamento de Botânica, CEP 31270-901, Belo Horizonte, MG, Brazil.
C R Biol. 2008 Apr;331(4):287-93. doi: 10.1016/j.crvi.2008.02.003. Epub 2008 Mar 5.
A study of the anatomy and ultrastructural aspects of leaf mesophyll and floral nectaries of Hymenaea stigonocarpa Mart. ex Hayne revealed the presence of intercellular pectic protuberances (IPPs) linking adjacent cells in both the leaf palisade cells and the secretory parenchyma of the floral nectary. Samples of the middle third of the leaf blade and of floral nectaries in anthesis were collected, fixed, and processed using standard procedures for light, transmission, and scanning electron microscopies. The IPPs of palisade cells of the mesophyll and the secretory parenchyma cells of the floral nectary take the form of scalae or strands, respectively. No evidence of the specific synthesis of these structures was observed, and they are apparently formed by the separation of adjacent cells due to cell expansion, when intercellular spaces develop. The IPPs observed in H. stigonocarpa increase cellular contact and probably act in apoplastic transport.
对孪叶豆（Hymenaea stigonocarpa Mart. ex Hayne）叶片叶肉和花蜜腺的解剖学及超微结构方面的研究表明，在叶片栅栏细胞和花蜜腺分泌薄壁组织中均存在连接相邻细胞的细胞间果胶突起（IPPs）。采集处于花期的叶片中部三分之一部分及花蜜腺样本，按照用于光学显微镜、透射电子显微镜和扫描电子显微镜观察的标准程序进行固定和处理。叶肉栅栏细胞和花蜜腺分泌薄壁组织细胞的IPPs分别呈梯状或丝状。未观察到这些结构有特异性合成的证据，它们显然是在细胞间隙形成时，由于细胞扩张导致相邻细胞分离而形成的。在孪叶豆中观察到的IPPs增加了细胞间接触，可能在质外体运输中起作用。
