Emilio Ghisleni Arenhardt

Variabilidade genética na busca de eficiência à produção de sementes e biomassa de capim Sudão

The objective of the study was to investigate the genetic variability of characters linked to inflorescence in populations of Sudan grass and the contribution of these variables in defining the most effective trait selection for seed yield. In addition, to provide subsidies to indicate that the selection pressure on the components of panicle to increase seed production does not compromise the character of forage interest. The experiments were conducted in the years 2009 and 2010 in the selection of plants for the characters tillering, biomass production and making up the inflorescence of the species. It was verified that there is genetic variability among populations of Sudan grass, especially in the mass character of panicle, number of grains in panicle and grain weight, variables of greatest contribution on the morphological differences observed in the inflorescence. Correlations were obtained for the effective mass of panicle and number of grains in panicle and increase in grain weight of panicle. The selection pressure on these characters does not bring harm on biomass and tillering.

Prediction of parental combination for introduction of stay-green associated loci in wheat

In wheat, the increase of yield and stability associated traits can be achieved by combining parents containing the stay-green trait and favorable alleles for grain yield. The aim of this work was to analyze the genetic dissimilarity between wheat lines from stay-green and synchronized maturation groups and elite cultivars. Moreover, to propose promising combinations seeking the selection of high-grain yield and high bread-making quality genotypes containing stay-green trait. The experiment was conducted in a randomized block design with three replications in 2003, 2004, and 2005, using sister-lines with the presence and absence of stay-green trait and elite cultivars. Genetic variability exists among wheat strains from the synchronized stay-green maturation group and elite cultivars. Genotypes of maturation group stay-green obtained an average performance superior to the synchronized group. Crosses between stay-green lines and the CEP 29 and BRS 177 cultivars are promising in the selection of genotypes carrying the stay-green trait with high yield and bread-making quality.