Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/96792
Type: Artigo de periódico
Title: Occurrence And Significance Of Polysomaty In Species Of Mimosa L
Author: Dahmer N.
Schifino-Wittmann M.T.
Giuliani J.C.
Abstract: Polysomaty is the occurrence of cells with different ploidy levels in the same organ or tissue and there are records of this in root-tip cells of some Mimosa species. The objective of the present work was to verify the occurrence, possible cause and significance of polysomaty in a range of species of this genus. In root-tip cells of 68 accessions of 43 diploid and tetraploid Mimosa species, the percentage of polysomatic cells ranged from 5% to 87%. Pretreatment with the antimitotic paradichlorobenzene did not cause polysomaty but increased it in some accessions. When relating seedling root size and percentage of polysomatic cells, for most of the species a higher percentage of polysomatic cells was found in roots from 6 to 10 cm length. For M. scabrella ("bracatinga"), a comparative analysis of seedling root-tip cells and roottip cells from well-developed plants kept in pots in a greenhouse showed that polysomaty occurred only in the seedling root-tips. The data suggest that, in Mimosa, polysomaty occurs only for a short period of the seedling development, probably as a natural mechanism to accelerate its development and establishment. © 2012 Dipartimento di Biologia Evoluzionistica, Università di Firenze.
Editor: 
Rights: fechado
Identifier DOI: 10.1080/00087114.2012.735895
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-84870011940&partnerID=40&md5=2ea8fe8f427363d658c80ba23f5bc4ad
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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