Evaluación de caracteres de planta y fruto en líneas recombinantes de tomate

RODRÍGUEZ, G. R.; GUILLERMO RAUL PRATTA; ZORZOLI, R.; PICARDI, L. A.

Ciencia e Investigacion Agraria

PONTIFICIA UNIVERSIDAD CATOLICA CHILE

Año: 2006 vol. 33 p. 133 - 141

0304-5609

Seventeen recombinant inbred lines of tomato (Lycopersicon esculentum) were obtained from an interspecific cross between tomato cv. ‘Caimanta’ and the accession LA722 of L. pimpinellifolium. Plant and fruit traits were evaluated in these lines as well as in the parental genotypes that served as controls. Significant differences were found among parental genotypes and recombinant inbred lines for plant traits (internodes length between third and fourth node, number of flowers per inflorescence, stem perimeter at the basal, middle, and apical part) and fruit traits (soluble solid content, pH, acidity, diameter, height, shape, weight, and shelf life). Significant differences were also found among recombinant inbred lines, in spite of the fact that many of them were similar to the wild parent. Fifteen lines had longer shelf life than LA722 that was the parent with the longest shelf life. A multivariate analysis of canonical correlation with plant and fruit traits and a cluster analysis were performed to classify the lines and the parental genotypes according to their performance for these traits. The first canonical correlation explained 73% of the total variance (p<0.01). According to the canonical coefficients those plants with the biggest stem perimeter and the lowest number of flowers per cluster produced the heaviest and the biggest fruits but they had low acidity. In the cluster analysis, shelf life was an important discriminatory trait for these lines and the parental genotypes. ‘Caimanta’ was the only genotype located in one group. The other clusters had genotypes with similar values for stem perimeter, fruit size, fruit weight, acidity and fruit shelf life. It was possible to obtain new genotypes that have recombinant traits from the parental genotypes and some of the new genotypes have an even longer shelf life than the wild parent. In conclusion, some of these new genotypes would be a new source of variability useful in tomato breeding programs.