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| Lopes,Willian A. L.; Souza,Luiz A; Moscheta,Ismar M; Albiero,Adriana L. M; Mourão,Káthia S. M. |
| Climbing plants differ from self-supporting plants, such as shrubs and trees, in a range of characteristics, most notable are the mechanical properties of the stem. Liana stems as Pereskia aculeata Mill. (Cactaceae), Pisonia aculeata L. (Nyctaginaceae), Arrabidaea mutabilis Bureau et K.Schum. (Bignoniaceae), Dalechampia stipulacea Müll.Arg. (Euphorbiaceae) and Dicella nucifera Chodat (Malpighiaceae) were collected in Brazilian forest remnants. The objective of this paper is: a) to analyze the comparative stem structure of these species; b) to answer the inquiry whether these species present cambial variants or not and to verify the modes of cambial activities, and c) to contribute with the anatomical identification of the liana species, characterizing... |
| Tipo: Journal article |
Palavras-chave: Anomalous growth; Climbing plants; Primary growth; Secondary growth; Cambial variant. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100005 |
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| Melzer, S.; Lens, F.; Gennen, J.; Vanneste, S.; Rohde , A.; Beeckman, T.. |
| Plants have evolved annual and perennial life forms as alternative strategies to adapt reproduction and survival to environmental constraints. In isolated situations, such as islands, woody perennials have evolved repeatedly from annual ancestors1. Although the molecular basis of the rapid evolution of insular woodiness is unknown, the molecular difference between perennials and annuals might be rather small, and a change between these life strategies might not require major genetic innovations2,3. Developmental regulators can strongly affect evolutionary variation4 and genes involved in meristem transitions are good candidates for a switch in growth habit. We found that the MADS box proteins SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1 (SOC1) and FRUITFULL... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Flowering-time; Meristem determinacy; Growth form; Arabidopsis thaliana; Insular woodiness; Secondary growth; Annual life forms; 42.56. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/429531 |
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| BOTÂNICO,MARLI P.; ANGYALOSSY,VERONICA. |
| Unlike other arboreal monocotyledons, the secondary growth of palms has for the past 100 years been described as diffuse. Solely cell enlargement and random parenchyma divisions, without the activity of a meristem, characterize such growth. Some previous works of the early 20th century have, however, mentioned the presence of a secondary meristem in the stems of palms, but this information was forgotten since then. Addressing to this question, we analysed palm stems of four species, with the aim to understand the possible presence of such secondary growth. We found that a meristematic band occurs between the cortex and the central cylinder and gives rise to new vascular bundles and parenchyma internally, producing parenchyma and fibres externally. It... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aerial stem; Meristematic band; Palms; Secondary growth; Stem anatomy; Subterranean stem. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401461 |
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