Abstract
This study had the objective of assessing the genetic divergence in giant missionary grass (Axonopus jesuiticus x A. scoparius) germplasm based on morphological and agronomic traits. Five accessions were evaluated in the field: V14337, V14403, V14404, V14405 and V14406. Three contrasting groups were formed using the UPGMA clustering method: V14337 and V14404 formed one group, V14403 and V14405 formed another, and V14406 was isolated from the other accessions. The most striking traits for the identification of the accessions were the height of the plant and the change color of the leaf. Only V14406 accession had purplish green leaves. The other four accessions differed with regards to plant height and dry matter production, with superiority of V14337 and V14404 accessions. The high similarity, as assessed by the mean Euclidean distance, suggests that V14337 and V14404 share the same genotype. The genotypic variability among accessions indicates their potential use in breeding programs.
Highlights
Cultivated pastures are the basis for Brazilian beef production, and occupy an area of 101.4 million hectares
The Unweighted Pair-group Method withArithmetic Mean (UPGMA) clustering revealed the formation of three groups: V14403 and V14405 (Group I), V14337 and V14404 (Group II) and V14406 (Group III) (Figure 1)
The accession V14406, isolated in Group III, was identified by the purplish color of the leaf blades. This attribute is characteristic of A. scoparius, one of the parent species of these hybrids
Summary
Cultivated pastures are the basis for Brazilian beef production, and occupy an area of 101.4 million hectares. From the samples collected in the State of Santa Catarina, five accessions were sent to Embrapa Genetic Resources and Biotechnology and evaluated by Lajús et al (2011) with regard to the dynamics and allocation of dry matter in greenhouse condition.
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