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与叶片运动相关的叶枕功能性状:维管系统的光学显微镜和透射电子显微镜研究

Pulvinus functional traits in relation to leaf movements: a light and transmission electron microscopy study of the vascular system.

作者信息

Rodrigues Tatiane M, Machado Silvia R

机构信息

São Paulo State University - UNESP, Institute of Biosciences, Department of Botany, PO Box 510, 18618-000 Botucatu, SP, Brazil.

出版信息

Micron. 2008;39(1):7-16. doi: 10.1016/j.micron.2007.09.001. Epub 2007 Sep 11.

Abstract

Previous studies on legume pulvini suggest that the vascular system plays an important role in the redistribution of ions and transmission of stimuli during leaf's movements. However, the number of anatomical and ultrastructural studies is limited to few species. The aim of this paper is to investigate the structure and cellular features of the pulvinus vascular system of nine legume species from Brazilian cerrado, looking for structural traits pointing to its participation in the leaf's movements. Samples were excised from the medial region of opened pulvinus of Bauhinia rufa, Copaifera langsdorffii, Senna rugosa (Caesalpinioideae), Andira humilis, Dalbergia miscolobium, Zornia diphylla (Faboideae), Mimosa rixosa, Mimosa flexuosa and Stryphnodendron polyphyllum (Mimosoideae), and were prepared following light microscopy, transmission electron microscopy and histochemical standard techniques. The vascular system occupies a central position, comprises phloem and xylem and is delimited by a living sheath of septate fibers in all the species studied. This living cells sheath connects the cortex to the vascular tissues via numerous plasmodesmata. The absence of fibers and sclereids, the presence of phenolic idioblasts and the abundance and diversity of protein inclusions in the sieve tube members are remarkable features of the phloem. Pitted vessel elements, parenchyma cells with abundant cytoplasm and living fibriform elements characterize the xylem. The lack of lignified tissues and extensive symplastic continuity by plasmodesmata are remarkable features of the vascular system of pulvini of the all studied species.

摘要

先前关于豆科叶枕的研究表明,在叶片运动过程中,维管系统在离子重新分布和刺激传递方面发挥着重要作用。然而,解剖学和超微结构研究的数量仅限于少数物种。本文的目的是研究来自巴西塞拉多的9种豆科植物叶枕维管系统的结构和细胞特征,寻找表明其参与叶片运动的结构特征。从紫铆叶羊蹄甲、朗氏 Copaifera、皱叶决明(苏木亚科)、卑微安第拉木、异色黄檀、二叶合萌(豆亚科)、皱叶含羞草、弯曲含羞草和多叶刺桐(含羞草亚科)开放叶枕的内侧区域切取样本,并按照光学显微镜、透射电子显微镜和组织化学标准技术进行制备。在所研究的所有物种中,维管系统占据中心位置,由韧皮部和木质部组成,并由具隔纤维的活鞘界定。这种活细胞鞘通过大量胞间连丝将皮层与维管组织相连。韧皮部的显著特征是没有纤维和石细胞、存在含酚异细胞以及筛管分子中蛋白质内含物的丰富性和多样性。具纹孔的导管分子、细胞质丰富的薄壁细胞和活的丝状成分是木质部的特征。所有研究物种叶枕维管系统的显著特征是缺乏木质化组织以及通过胞间连丝形成广泛的共质体连续性。

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