To study the ontogeny of the extrafloral nectaries present in the inflorescences of Vigna luteola (Jacq.) Benth (Leguminosae, Phaseolinae), the location, morphology, anatomy of the earliest stages, histology of the definitive structures and ultrastructure of the secretory stage were analyzed. The extrafloral nectaries at different developmental stages were examined with light microscopy and scanning electron microscopy. The secretory stage was also examined with transmission electron microscopy. The racemose inflorescence of V. luteola has six nodes. At each node, a short globose secondary axis bears two flowers and one to three extrafloral nectaries. Each extrafloral nectary originates from the abscission of a flower bud and is formed by two differentiated zones: a ring of epidermal cells surrounding a group of longitudinally enlarged papillose central cells, both with underlying secretory parenchyma. The primary secretory tissue consists of the central cells, while the ring contributes to secretion to a lesser degree. Secretion is granulocrine, by means of exocytotic vesicles and plasmalemma invaginations. Four developmental stages succeed; the third one being the secretory. The extrafloral nectaries activity period starts when the flowers of the same secondary axis open and ceases before fruit development.
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机译:为了研究Vigna Luteola(JACQ)的花序中存在的预生制性细胞生成的细胞生成(乳杆菌,phacumolina),最早阶段的位置,形态,解剖学,分析了分泌阶段的最终结构和超微结构的组织学。用光学显微镜和扫描电子显微镜检查不同发育阶段的外汇核。还使用透射电子显微镜检查分泌阶段。 V. luteola的菌根糖花序有六个节点。在每个节点处,较短的球状次级轴带有两朵花和一到三个外来的蜜腺。每种外氟碳碱来自花蕾的脱落,并且由两个分化的区域形成:一组表皮细胞环,周围的一组纵向扩大的乳头中央细胞,既与下面的分泌薄膜。初级分泌组织由中央电池组成,而环的有助于分泌到较小程度。分泌是粒细胞分泌物,通过递卵细胞囊泡和Plasmalma Invagination。四个发展阶段成功;第三个是分泌物。外汇Nectaries活性期开始,当果实开发前的相同次轴的花朵开放并停止。
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