Secretory structures of Ipomoea asarifolia: anatomy and histochemistry

Revista Brasileira de Farmacognosia

Fabiano M. Martins¹  Jamile F. Lima¹  Ana Angélica S. Mascarenhas¹  Thayane P. Macedo¹ 

[1] ,Universidade Federal do Recôncavo da Bahia Centro de Ciências Agrárias Ambientais e Biológicas Laboratório de Anatomia e Histoquímica Vegetal,Brazil

关键词: colleter;    Ipomoea asarifolia;    laticifer;    nectar;    secretory structure;   

DOI  :  10.1590/S0102-695X2011005000162

来源: SciELO

【 摘 要 】

Ipomoea asarifolia (Desr.) Roem. & Schult., Convolvulaceae, is a weed that infests agricultural areas and is toxic to cattle. In spite of its toxicity, the leaves of this plant are used in traditional remedies in the state of Bahia, Brazil. The present work describes the leaf anatomy of I. asarifolia and characterizes the exudates of its secretory structures. The leaves have a unistratified epidermis composed of ordinary cells with straight to slightly sinuous anticlinal walls and thin cuticles. Paracytic stomata are found on both surfaces of the leaves at the same level as the ordinary epidermal cells. Trichomes producing polysaccharide secretions occur on the petiole and leaf blade and are considered colleters. The mesophyll is dorsiventral and the vascular bundle of the central vein is bicollateral. Two opposed nectaries occur on the petiole near the leaf blade. Each nectary is composed of a small canal with internal ramifications and numerous secretory trichomes. The laticiferous glands are articulated, not anastomosed, and are composed of large diameter cells with thin cell walls. The secretions of the laticiferous glands are lipidic.

【 授权许可】

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