Cristiano Lemes da Silva

Métodos para análise de adaptabilidade e estabilidade em cultivares de trigo no estado do Paraná

This investigation had the objective to evaluate grain yield adaptability and stability of 17 wheat cultivars (Triticum aestivum L.) for Parana State, Brazil, occording to four different methods. The experiments were carried out in 2007, at different locations of Parana, in complete randomized blocks experimental design, with 4 replicates. The Wricke (1965) methodology indicates stable cultivars, independently of average yield. Eberhart and Russell (1966) and Cruz et al. (1989) methodologies were equally efficient to evaluate stability and indicate cultivars that are stable and also adapted to favorable and unfavorable environments. Lin and Binns (1988) methodology showed to be of easy interpretation and was efficient to indicate cultivars of high yield and with good stability, where more responsive materials showed a lesser Pi, and high negative correlation of Spearman between grain yields. It was concluded that LIN and BINNS methodology is very specific and when associated to Wi offers more assurance in recommending cultivars for high stability.

Qualidade industrial do trigo em resposta à adubação verde e doses de nitrogênio

The objective this study was to investigate the effects of green manures cultivated between the maize and wheat crop and nitrogen rates on baking quality of spring wheat. Treatments consisted of four nitrogen fertilization rates: without N addition, 40, 80 and 120 kg ha-1 using the amidic form, and six managements before wheat crop: four green manures forage pea, common pea, oilseed radish and lupine, common bean grown for commercial purposes, and the fallow between the corn harvest and wheat cropping. The experimental design was in randomized blocks and factorial scheme, with three replicates. The protein yield increased linearly with the application of mineral N rates. The nitrogen rates of 80 and 120 kg ha-1 improved the baking wheat quality. The forage pea, oilseed radish and common pea allowed ideal index of baking quality and satisfactory crop yield, reducing the demand for mineral N fertilization.

Agronomic performance of wheat cultivars in response to nitrogen fertilization levels

The release of wheat cultivars with different nutritional demands and yield potential hinders generalized recommendations for nitrogen fertilization. This study was designed to evaluate the effects of different nitrogen fertilization levels (0, 60, 120 and 180 kg ha -1 of N) on the agronomic performance of six wheat cultivars ( Triticum aestivum L.) in two harvests. A randomized block factorial design with three replications was used. The response to fertilization levels was evaluated through AMMI (Additive Main effects and Multiplicative Interaction) and GGE (Genotype main effects and Genotype x Environment interaction) biplot graphic methodologies and polynomial regression. There was genetic variability in response to nitrogen fertilization in the cultivars studied. The biggest increases in yield were observed under a more suitable water regime. The higher performance of yield components was associated with higher nitrogen fertilization levels.

Análises biplot na avaliação de cultivares de trigo em diferentes níveis de manejo

The objective of this study was to evaluate the agronomic performance of wheat cultivars under different management levels. Experiments were carried out in Pato Branco (PR), within crop years 2008 and 2009. The experimental design was randomized blocks in factorial scheme, with three replicates. Treatments consisted in four levels of management, control (E1), traditional (E2) and optimized (E3 and E4), distinguished by level of chemical fertilization and by control of weeds, pests and diseases. Methodologies in AMMI and GGE biplot graphics were used for data analysis. The levels of management maximized the wheat yield, especially when meteorological features were not limiting. Adaptability showed difference among cultivars in the crop managements. The BRS Guamirim cultivar showed adaptability to levels E3 and E4 in crop year 2008, whereas it was associated to E1 and E2 in crop year 2009. Only the cultivars BRS Tangara (E1 and E2) and Pampeano (E3 and E4) kept association consistency to traditional and optimized levels, in both years. Biplot techniques are efficient to indicate more adapted cultivars to levels of crop management in wheat.

Monitoring levels of deoxynivalenol in wheat flour of Brazilian varieties

Deoxynivalenol (DON) is a mycotoxin produced by Fusarium graminearum and its intake represents a severe risk to human and animal health. The objective of this study was to evaluate levels of DON in wheat (Triticum aestivum L.) flour from two representative locations of south Brazil. Experiments were carried out in Pato Branco (Parana) and Coxilha (Rio Grande do Sul) in a randomized complete block design with three replicates. Levels of DON were measured by high-performance liquid chromatography coupled with mass spectrometry (HPLC-MS/MS). This mycotoxin was detected in 97% of samples, ranging from 200 to 4140 u,g kg-1. Only 17% of samples presented DON beyond of the maximum allowed by the Brazilian Health Surveillance Agency up to the year 2012; even though, Fusarium head blight (FHB) epidemics were slight low in the growing season that the study was performed. According to our knowledge, this is the first report showing genetic variability of Brazilian cultivars to DON contamination and some genotypes have potential to be exploited as a source of low accumulation of this toxin.

Seleção de genótipos de trigo para rendimento de grãos e qualidade de panificação em ensaios multiambientes

The objective of this study was to select wheat lines for baking quality and grain yield in multi-environment trials in order to identify ideal test environments for selection. A total of 39 wheat genotypes, 18 inbred lines and 9 checks were evaluated in 2010, and other 11 inbred lines and 4 checks in 2011, in the state of Parana. Some lines and locations were not repeated between the two years. The experimental design was a randomized block design with three replications. GGE biplot analysis (Genotype and Genotype-by-environment) was used to evaluate the genotypes and test environments. The locations Nova Fatima, Pitangueiras and Ventania were discriminative (maximized the expression of yield potential and the differentiation among genotypes) and representatives of the environments evaluated in the 2010 crop season. Rolândia and Astorga stood out as ideal environments to select better genotypes for baking quality in 2011. The inbred lines BIO-08528 and BIO-08228 were classified as ideal genotypes for grain yield (GY) and grain protein concentration (GPC), respectively. However, in 2011 the inbred lines BIO-10161 and BIO-10141 were superior for baking quality and GY, respectively. SDS sedimentation test and GPC were correlated each other (r= 0,61**) and moderately associated with the gluten strength (r=0,49 and** 0,74**), indicating that both traits can be used for indirect selection of baking quality.

Desempenho agronômico de cultivares de trigo em resposta a doses de adubação nitrogenada

The release of wheat cultivars with different nutritional demands and yield potential hinders generalized recommendations for nitrogen fertilization. This study was designed to evaluate the effects of different nitrogen fertilization levels (0, 60, 120 and 180 kg ha -1 of N) on the agronomic performance of six wheat cultivars ( Triticum aestivum L.) in two harvests. A randomized block factorial design with three replications was used. The response to fertilization levels was evaluated through AMMI (Additive Main effects and Multiplicative Interaction) and GGE (Genotype main effects and Genotype x Environment interaction) biplot graphic methodologies and polynomial regression. There was genetic variability in response to nitrogen fertilization in the cultivars studied. The biggest increases in yield were observed under a more suitable water regime. The higher performance of yield components was associated with higher nitrogen fertilization levels.

Agronomic performance of wheat cultivars in response to nitrogen fertilization levels - doi: 10.4025/actasciagron.v34i3.14468

The release of wheat cultivars with different nutritional demands and yield potential hinders generalized recommendations for nitrogen fertilization. This study was designed to evaluate the effects of different nitrogen fertilization levels (0, 60, 120 and 180 kg ha -1 of N) on the agronomic performance of six wheat cultivars ( Triticum aestivum L.) in two harvests. A randomized block factorial design with three replications was used. The response to fertilization levels was evaluated through AMMI (Additive Main effects and Multiplicative Interaction) and GGE (Genotype main effects and Genotype x Environment interaction) biplot graphic methodologies and polynomial regression. There was genetic variability in response to nitrogen fertilization in the cultivars studied. The biggest increases in yield were observed under a more suitable water regime. The higher performance of yield components was associated with higher nitrogen fertilization levels.