RODRIGUEZ Gustavo Ruben
Evaluation of plant and fruit traits in recombinant inbred lines of tomato obtained from a cross between Lycopersicon esculentum y L. pimpinellifolium
RODRÍGUEZ, GUSTAVO RUBÉN; PRATTA, GUILLERMO RAUL; ZORZOLI, ROXANA; PICARDI, LILIANA AMELIA
CIENCIA E INVESTIGACIÓN AGRARIA
Facultad de Agronomía e Ingeniería Forestal de la Pontificia Universidad Católica de Chile
Año: 2006 vol. 33 p. 133 - 133
Seventeen tomato RILs (Recombinant Inbred Lines) were obtained from an interspecific cross between Lycopersicon esculentum 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 the RILs for plant traits (Internodes length between third and fourth node, number of flowers per cluster, 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 RILs, 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. Tomato cv. 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.