Selection based on meiotic behavior in <i>Urochloa decumbens</i> hybrids from non-shattered seed

Authors

  • Joana Neres da Cruz Baldissera Colegiado de Biologia, Instituto Federal do Paraná, Palmas, PR, Brazil. palmas. https://orcid.org/0000-0002-1816-6047
  • Andréa Beatriz Diverio Mendes Departamento de Agronomia, Universidade Estadual de Maringá, Maringá, PR, Brazil.
  • Marlon Mathias Dacal Coan Departamento de Agronomia, Universidade Estadual de Maringá, Maringá, PR, Brazil.
  • Claudete Aparecida Mangolin Departamento de Agronomia, Universidade Estadual de Maringá, Maringá, PR, Brazil.
  • Cacilda Borges do Valle Empresa Brasileira de Pesquisa Agropecuária, Embrapa Gado de Corte, Campo Grande, MS, Brazil.
  • Maria Suely Pagliarini Departamento de Agronomia, Universidade Estadual de Maringá, Maringá, PR, Brazil.

DOI:

https://doi.org/10.17138/tgft(8)133-140

Abstract

This study aimed to evaluate the end-products of meiosis in sexual and apomictic hybrids of Urochloa decumbens, so as to identify genotypes with good production of viable pollen for use in breeding programs to increase yields of pure viable seed and reduce degree of seed shattering. From 457 intraspecific hybrids of U. decumbens arising from crosses between 3 artificially tetraploidized sexual plants and the apomictic cultivar Basilisk, 27 hybrids from non-shattered seed were selected. Slides were prepared by smearing anthers and staining to determine the presence of abnormalities. The abnormalities found were micronuclei, microcytes and polyads. The data were compared by the Scott-Knott test at P<0.05. Data obtained enabled separation of hybrids into 4 groups depending on the presence of micronuclei and formation of polyads and into 6 groups based on the presence of microcytes in the tetrads. Among the analyzed apomictic hybrids, R179 has the attributes for viable seed production to proceed to cultivar development. Among the sexual hybrids, R161, R181, R193 and S47 are recommended as female parents for use in crossing programs.

How to Cite

Baldissera, J. N. da C., Mendes, A. B. D., Coan, M. M. D., Mangolin, C. A., Valle, C. B. do, & Pagliarini, M. S. (2020). Selection based on meiotic behavior in <i>Urochloa decumbens</i> hybrids from non-shattered seed. Tropical Grasslands-Forrajes Tropicales, 8(2), 133–140. https://doi.org/10.17138/tgft(8)133-140

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Published

2020-05-30

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Section

Research Papers