<b>Genetic admixture in species of <i>Conyza</i> (Asteraceae) as revealed by microsatellite markers

Carlos Alexandre Marochio; Maycon Rodrigo Ruiz Bevilaqua; Hudson Kagueyama Takano; Claudete Aparecida Mangolim; Rubem Silvério de Oliveira Junior; Maria de Fátima Pires Silva Machado

doi:10.4025/actasciagron.v39i4.32947

Carlos Alexandre Marochio Universidade Estadual de Maringá
Maycon Rodrigo Ruiz Bevilaqua Universidade Estadual de Maringá
Hudson Kagueyama Takano Universidade Estadual de Maringá http://orcid.org/0000-0002-8018-3868
Claudete Aparecida Mangolim Universidade Estadual de Maringá
Rubem Silvério de Oliveira Junior Universidade Estadual de Maringá
Maria de Fátima Pires Silva Machado Universidade Estadual de Maringá

DOI: https://doi.org/10.4025/actasciagron.v39i4.32947

Resumo

The distinction among Conyza canadensis, C. bonariensis, and C. sumatrensis is a challenge for weed science. In the current study, primers for microsatellite (SSR) loci were used to investigate the molecular divergence among the three species, the genetic structure of the populations at the molecular level and the level of genetic admixture among Conyza plants from southern Brazil. Twelve primers amplified well-defined DNA segments for all 88 samples of the three Conyza species. The estimated proportion of SSR polymorphic loci, number of alleles, and mean expected heterozygosity were higher in samples of C. bonariensis than in samples of C. sumatrensis or C. canadensis. Conyza canadensis was the species with the lowest molecular diversity. High genetic divergence was observed among the three species. The well-defined ancestral groups for each species led to the identification of samples of Conyza with ancestral genomes from the three species. Hybridization events between pairs of these species may have occurred in crop fields from southern Brazil. The high molecular diversity in resistant biotypes of C. sumatrensis indicated that these biotypes have a high potential to colonize new areas, which increases its potential as a weed.

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Biografia do Autor

Carlos Alexandre Marochio, Universidade Estadual de Maringá

Engenheiro Agrônomo pela Universidade Estadual de Maringá, e atualmente é mestrando em Agronomia na área de ciência das plantas daninhas

Maycon Rodrigo Ruiz Bevilaqua, Universidade Estadual de Maringá

Doutor em Biologia, Programa de Pós-graduação em Biologia Comparada, Universidade Estadual de Maringá

Hudson Kagueyama Takano, Universidade Estadual de Maringá

Mestrando em Agronomia, Programa de Pós-graduação em Agronomia, Universidade Estadual de Maringá

Claudete Aparecida Mangolim, Universidade Estadual de Maringá

Professor Associado, Programa de Pós-graduação em Genética e Melhoramento, Universidade Estadual de Maringá

Rubem Silvério de Oliveira Junior, Universidade Estadual de Maringá

Professor Associado, Programa de Pós-graduação em Agronomia, Universidade Estadual de Maringá

Maria de Fátima Pires Silva Machado, Universidade Estadual de Maringá

Professor Associado, Programa de Pós-graduação em Agronomia, Universidade Estadual de Maringá

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