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RESEARCH ARTICLE
Contents Vol 54(4)

Chromosome studies in species of Eugenia, Myrciaria and Plinia (Myrtaceae) from south-eastern Brazil

Itayguara Ribeiro da Costa A C and Eliana Regina Forni-Martins B
+ Author Affiliations
- Author Affiliations

A Programa de Pós-graduação em Biologia Vegetal, Instituto de Biologia (IB), Universidade Estadual de Campinas (UNICAMP), Caixa Postal 6109, Campinas, 13083-970 São Paulo, Brazil.

B Departamento de Botânica, Instituto de Biologia (IB), Universidade Estadual de Campinas (UNICAMP), Caixa Postal 6109, Campinas, 13083-970 São Paulo, Brazil.

C Corresponding author. Email: itayguara@yahoo.com

Australian Journal of Botany 54(4) 409-415 https://doi.org/10.1071/BT04199
Submitted: 21 December 2004  Accepted: 19 December 2005   Published: 22 June 2006

Abstract

The chromosome numbers of Brazilian species of Myrtaceae were reassessed in the context of chromosomal evolution in fleshy-fruited Myrteae. The chromosome numbers of 14 species of Eugenia, three of Myrciaria and two of Plinia were determined, 14 of which had not been published before. In Eugenia, a diploid state (2n = 22) was found in nine species, polyploid (2n = 33 or 2n = 44) in three species, and both diploid and polyploid cytotypes in another three species. The percentage of Eugenia species with a known chromosome number increased from 19 to 31 species, 22.6% of which were polyploid (3 triploid, 1 tetraploid and 3 hexaploid) and a further 16.1% either dysploid from the triploid level or had both diploid and polyploid races, giving a total of 38.7% in which polyploidy is recorded. In Myrciaria (3 species) and Plinia (2 species), the chromosome number was 2n = 22, with no polyploidy known in these genera. The results reinforce the previous indications that polyploidy is of great importance in the evolution of fleshy-fruited Myrteae.


Acknowledgments

IRC was supported by a scholarship Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and ERFM is the recipient of a research fellowships from the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). This work was supported by FAPESP (Grant no. 01/13169-6). The authors thank C. F. Verola, C. Urbanetz, F. R. Martins, K. F. Rodrigues and R. Macedo for donating the material of some species, M Sobral (UFMG) for indentifying the species, and J. H. Dutilh, K. Yamamoto and C. E. B. Proença for improvements to the manuscript.


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