Abstract
Abstract Paspalum notatum is an important forage native to Southern Brazil and one of the most promising fodder species in terms of productivity, quality, resistance and growth speed. The objective of this study was to evaluate the reproductive mode and fertility of hybrid progenies resulting from artificial crosses among artificially duplicated sexual plants, selected intraspecific hybrids of the UFRGS breeding program and apomictic ecotypes of the species. The resulting F1 progenies were represented by 24 plants with high pollen viability (varying from 82.15 to 99.67%) and 1.2:1 segregation for the sexual: apomictic reproduction mode, indicating predominantly sexual hybrids, due to distorted segregation. In the apomictic plants, most chromosomes paired as bivalents in diakinesis. Since the low presence of abnormalities observed in the meiotic chromosome pairing and the high pollen viability of the hybrids, all plants were confirmed as promising parents for future crosses.
Highlights
Papsalum notatum, a perennial summer forage grass, is the main herbaceous product of most native pastures of Rio Grande do Sul State
This alternative is less viable, because unchanged natural germplasm does not provide ideal cultivars even in forage plants (Miles 2007); the pastures without variability are advantageous for animal management but represent a serious risk when planted over wide expanses of land (Simioni and Valle 2009)
The objective of this study was to determine the reproduction mode and pollen viability of segregating hybrid progenies of P. notatum and to analyze the meiotic chromosome pairing of the plants with apomictic reproduction mode to confirm its reproductive stability, in order to be used as future parents in breeding programs
Summary
A perennial summer forage grass, is the main herbaceous product of most native pastures of Rio Grande do Sul State. Many of the currently planted cultivars originate from this form of breeding (Hojsgaard et al 2016). It depends on research and natural selection of superior ecotypes, which greatly limits their potential. This alternative is less viable, because unchanged natural germplasm does not provide ideal cultivars even in forage plants (Miles 2007); the pastures without variability are advantageous for animal management but represent a serious risk when planted over wide expanses of land (Simioni and Valle 2009). Since sexual diploids are frequently found in the genus Paspalum (Martínez et al 2007), it is possible to improve apomictic species by making crosses with relatives of sexual reproduction, ORCID: 0000-0002-0642-6980
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