Antonio Sidney Pompeu

Estabilidade fenotípica de linhagens de feijoeiro em três épocas de plantio no Estado de São Paulo

Aiming at knowing the yield potential behavior of selected common bean lines based on data of phenotypical stability, two experimental sets were carried out in the three traditional growing seasons: rainy (September-October), dry (January-February) and winter (May-June). The first set, with 47 trials, was made up of 16 experimental lines and the check Carioca 80SH cultivar; the second, with 44 trials, was made up of 11 lines and the checks Carioca 80SH and Rosinha G2 cultivars, allocated to the three growing seasons above cited. The experimental design was a randomized complete block with five replications and plots constituted of a line of 5 m of length. Joint (general and seasonal) and single (per season) statistical analyses were performed on the yield data. Phenotypical stability and responsiveness were estimated by Cruz et al. (1989). Several adapted lines in unfavorable environments were observed in at least a growing season. Several genotypes showed high responsiveness or stability. The results indicated the feasibility of recommending cultivars through the selection of the best adapted and responsive experimental lines, specific for each growing season.

ESTRATIFICAÇÃO DE AMBIENTES EM EXPERIMENTOS DE FEIJOEIRO NO ESTADO DE SÃO PAULO

Genotype by environment interactions (GE) were estimated to identify contrasting and similar groups of environments. Joint variance analysis was performed for three experiments (E1, E2 and E3) of common dry bean in randomized complete block design with five replications carried out in the dry season (summer/fall) of 1990-93, in the winter season (fall/winter) of 1990-93 and also in the rainy season (spring/summer) of 1990-92. E1, E2 and E3 were made up of 17, 13 and 13 genotypes, respectively. The results identified environments where the GE interaction was highly significant such as those of Pariquera-Acu, Capao Bonito and Itabera counties. In the Ribeirao Preto, Votuporanga, Aguai, Mococa and Riversul counties the GE interaction was not significant, showing that they were ecologically similar. These locations were considerated the most homogeneous for yield and genotype evaluations.

Linhagem isogênica no feijoeiro para resistência ao fungo da antracnose

An isogenic dry bean line (Phaseolus vulgaris) was developed using Rosinha 1454-10 as recurrent parent susceptible to Colletotrichum lindemuthiamun and Cornell 49-242 as the donor one. Ten backcrosses to the recurrent parent were made. Seedlings in the F1 generation of each backcross and in the F2 and F3 of the 10th backcross were inoculated using a spore suspension containing about 105 spores/ml, through a De Vilbiss atomizer, under greenhouse or laboratory conditions. The isogenic lines Rosinha 1454-10 and Rosinha 1454-10 Are Are will be used to estimate the losses of dry bean yield due to the anthracnose agent.