R. Bras. Zootec.16/Sep/2022;51:e20220015.
Characterization and genetic diversity in Paspalum notatum Flügge accessions: Morphological and geographical distance
Marcelo Gomes Steiner
, Roberto Luis Weiler
, André Pich Brunes
, Annamaria Mills
, Miguel Dall’Agnol
, Carlos Nabinger
, Eder Alexandre Minski da Motta
, Diógenes Cecchin Silveira
, Rodrigo Sampaio
, Gabriel Tessis
ABSTRACT
The objective of this work was to describe morphology and grouping of Paspalum notatum accessions, based on multicategorical data which discards the redundant variables for quantification of genetic diversity. We also tested the hypothesis that geographical distance was correlated with morphological divergence. In our study, multivariate analyzes successfully demonstrated the geographic and morphological variability of the P. notatum accessions characterized. Many of these evaluated accessions can be included in future genetic improvement programs. Based on two methodologies for discarding variables, it was possible to identify the potentially important morphological characteristics from genetic diversity studies and characterize new accessions aimed at improving forage and seed production. The methodologies used to discard variables are biometric tools that can be used successfully in future plant breeding programs, especially when a large number of traits and accessions are being evaluated. Although significant, geographic distance had a low association with morphological traits. This indicated the need to use other characteristics, such as forage and seed yield, in addition to molecular analysis. Our analyzes showed genetic variability in P. notatum for all the characteristics studied.
Keywords: cluster analysis; hierarchical method; optimization method; Tocher