1 resultado para marginal parenchyma
em Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (BDPI/USP)
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Resumo:
This work describes the occurrence and distribution pattern of non-lignified parenchyma in species of Cactaceae and Portulacaceae, of which samples of roots and stems of six species of Cactaceae and four species of Portulacaceae were analysed. The first records of non-lignified parenchyma in Portulacaceae were obtained and, in the case of Cactaceae, an in-depth discussion is given on the characterization of this tissue by various authors, as well as new information on the occurrence and distribution pattern of the non-lignified parenchyma. The terminology used to characterize the non-lignified parenchyma cells in the wood of Cactaceae is extremely diversified and often not very descriptive, which makes it difficult to establish homologies and better characterize this tissue. Non-lignified parenchyma cells in the secondary xylem in Cactaceae and Portulacaceae occur in association with the fibrous phase of the wood, often forming true continuous bands. This resembles what some authors call parenchyma wood. The proposal of this study is to demonstrate that, independent of the distribution pattern of the non-lignified parenchyma cells, the terminology used should follow that of the International Association of Wood Anatomists (IAWA) Committee as non-lignified parenchyma and not refer to a parenchymous phase of the wood. (C) 2009 The Linnean Society of London, Botanical Journal of the Linnean Society, 2009, 159, 322-329.