RESUMO (Espessamento das raízes aéreas de espécies de Pandanus Parkinson (Pandanaceae)). Raízes e caules de monocotiledôneas são órgãos que, usualmente, não apresentam crescimento secundário ou em espessura. Porém, pode ocorrer e, para as raízes, a literatura não fornece muitas informações. Espécies do gênero Pandanus são facilmente encontradas em áreas urbanas e se caracterizam pela presença de raízes aéreas espessadas, oriundas do caule. Para verificar como ocorre o espessamento, raízes de P. utilis Bory, P. baptisti Hort., P. amaryllifolius Roxb e P. veitchii Hort, foram coletadas amostras das raízes em áreas urbanas, fixadas e processadas conforme técnica usual para análise ao microscópio de luz. Para todas as espécies o espessamento ocorre no sentido acrópeto, por meio da formação e expansão de espaços de espaços intercelulares no córtex e no cilindro vascular, atividade meristemática da proendoderme, divisão e aumento de volume das células parenquimáticas do córtex e do cilindro vascular e atividade meristemática do periciclo.
Respostas morfoanatômicas, fisiológicas e químicas de Allagoptera campestris (Mart.) Kuntze (Arecaceae) crescendo em áreas de Cerrado com e sem interferência do Pinus sp. / Lucas Henrique Santos Barbosa. --versão revisada de acordo com a resolução CoPGr 6018 de 2011. --Piracicaba, 2021. 66 p. Dissertação (Mestrado) --USP / Escola Superior de Agricultura "Luiz de Queiroz". 1. Anatomia quantitativa 2. Palmeira 3. Rebrotamento 4. Reservas 5. Rizoma I.Título.
Aims. Since underground plant organs, usually the thickened ones, are structures capable of producing buds that allow shoot regrowth when the aerial part of the plants is eliminated by human disturbances or fire episodes and some plants have roots that produce buds, which may or may not be branched systems, but which allow vegetative propagation in unfavorable environments, due the presence of carbohydrate of reserves tis study aimed to analyze the roots of two Brazilian species, Apeiba tibourbou and Pachira aquatica, which present starch grains, root buds and capacity to propagate vegetatively and to compare the anatomical structure of these gemiferous roots.
Methods. The material of both species was analyzed in loco environment, collected and anatomical standardized methods were used to compare the species. Also tests for carbohydrate detection were made.
Results. Anatomical analyses showed that these roots produce endogenous buds, originating from pericycle cells in A. tibourbou and from parenchyma rays in P. aquatica. Both species presented starch as carbohydrate reserve but with significance difference on the amount between them.
Conclusions.The results demonstrated the diversity not only in relation to the high potential of differentiation and specialization of plant cells, but also in relation to the reproductive strategies adopted by these species, whether they are associated with the environment or not.
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