ABSTRACT
The objective of this study was to evaluate 94 Paspalum notatum genotypes over two growing seasons to estimate genetic dissimilarity through agronomic traits and the distance between genotypes. This information is used to create an ideotype from the best averages obtained for the set of characteristics evaluated. Seven apomitic, three sexual, and 81 hybrid genotypes were compared with native genotypes “André da Rocha”, “Bagual”, and cultivar “Pensacola” as controls. There is genetic variability in P. notatum for the studied characteristics, and distinct genotypes with superior characteristics can be used in new combinations between apomictic and sexual plants to obtain hybrids. The characters with the greatest relative contribution to the dissimilarity between the genotypes were tiller density, stem dry mass, and leaf dry mass yield. Thus, these characteristics are suitable criteria to infer genetic distance studies in P. notatum . The selection index based on the ideotype is an auxiliary tool in the breeding process. The ideotype must be based on characteristics of interest according to the objective of the breeding program, as well as on the breeder’s prior knowledge in relation to culture.
cluster analysis; intraspecific hybrids; plant breeding
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PH - plant height (cm); TPD - tiller population density (tillers plant−1); ATDM - accumulated total dry mass (kg of DM plant−1); ALDM - accumulated leaf dry mass (kg of DM plant−1); ASDM - accumulated stem dry mass (kg of DM plant−1); AIDM - accumulated inflorescence dry mass (kg of DM plant−1); LSR - leaf:stem ratio.
PH - plant height (cm); TPD - tiller population density (tillers plant−1); ATDM - accumulated total dry mass (kg of DM plant−1); ALDM - accumulated leaf dry mass (kg of DM plant−1); ASDM - accumulated stem dry mass (kg of DM plant−1); AIDM - accumulated inflorescence dry mass (kg of DM plant−1); LSR - leaf:stem ratio.