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 […]

ABSTRACT The aim of this study was to determine the mode of reproduction of a hybrid progeny derived from intraspecific crosses of Paspalum notatum through cytoembryological analysis and use of RAPD (random amplification of polymorphic DNA) molecular markers. Cytoembryological analysis allowed identification of the mode of reproduction of 28 plants that were selected after agronomic productivity evaluations. Of these, 19 had embryo sac morphology compatible with an apomictic mode of reproduction and nine had embryo sac morphology compatible with a […]

The objective of this study was to proceed with an initial evaluation of various strains of white oats (Avena sativa, L.), with the objective of characterizing the genetic diversity and the agronomic performance, identifying the promising genotypes for the release of cultivars, with the purpose of forage production. The experiments were conducted in two geographical regions of the State of Rio Grande do Sul, Depressão Central and in the Campanha Gaúcha, Brazil, in the years 2008 and 2009, in a […]

The objective of this study was to select superior genotypes in half-sib populations obtained from crosses between sexual plants and apomictic accessions. The experiment also proposed to compare among and within family and combined selection strategies. Ten plots of sexual plants were randomly distributed among 230 plots of apomictic accessions. After natural pollination, seeds of each sexual plant constituted a half-sib family. Thirty plants of each female progenitor were evaluated in a randomized block design experiment, with five plants per […]

The morphological characteristics of alfalfa plants associated to the grazing aptitude were evaluated in this trial. Three Crioula alfalfa populations originated from different regions without grazing history were evaluated: Chile, Roque Gonzales and Vale do Taquari, besides two North American cultivars, ABT 805, selected under grazing and CUF 101, selected under mowing. The trial was composed of plots with different materials, kept under grazing, where the grazing residue was constantly kept at 3-5 cm of height during a 255-day period […]

The aim of this study was to estimate the genetic diversity among accesses of P. urvillei of Departamento de Plantas Forrageiras e Agrometeorologia (DPFA) of the College of Agronomy – UFRGS and to evaluate their use in selection programs. Sixty four accesses from different cities of the Southern Region of Brazil (Rio Grande do Sul, Santa Catarina and Parana States) and from Argentine were analyzed by RAPD and SSR molecular markers. Ten primers of RAPD markers were used and resulted […]

This work aimed to evaluate morphological features of the white clover core collection obtained from the United States Department of Agriculture (USDA), represented by 78 accessions, in order to characterize the existent morphological variability and to estimate the genetic divergence, using nine characters (eight morphological and one agronomic). Seventeen plants from each access were evaluated individually at the Experimental Station of the Universidade Federal do Rio Grande do Sul in Eldorado do Sul and characterized in relation to the following […]

Red clover is a temperate legume species that shows good dry matter yield potential and forage quality, being indicated to supplement livestock animals during the cool season in the Southern part of Brazil. The objective of this experiment was to study seed yield in red clover through the use of path analysis, aiming to generate basic information to be used on breeding program or in management strategies, which lead to an increase on seed yield, natural reseeding and thus to […]

This work aimed to characterize an elephantgrass collection (Pennisetum purpureum Schum.) comprising 71 clones and selecting the best ones to be tested later under grazing conditions. It was carried out at Cedro Experimental Station – IPA, located in Vitória de Santo Antão, forest zone of Pernambuco State. The period of evaluation included both the raining and the dry season. Each clone was represented by a non-replicated plot of 10 m2. According to linear correlation analysis, the more productive clones also […]