Abstract

GALLO, Mariana; RODRIGUEZ, Gustavo Rubén; ZORZOLI, Roxana  and  PRATTA, Guillermo Raúl. Genetic linkage among tomato fruit quality traits and polypeptides expressed at two ripening stages. Rev. Fac. Cienc. Agrar., Univ. Nac. Cuyo [online]. 2011, vol.43, n.2, pp.145-156. ISSN 1853-8665.

Polypeptide profiles are informative about the individual gene constitution and expression, and become useful tools as molecular markers. The objective of this work was to detect genetic linkage among polypeptide profiles of the pericarp at two ripening stages and fruit quality traits in 21 tomato genotypes. Polypeptide profiles were obtained from mature green and red ripe fruits of 18 recombinant inbred lines (RILs) derived from an interspecific cross between the cultivar Caimanta of S. lycopersicum and the accession LA722 of S. pimpinellifolium, parents that were included with their hybrid as experimental testers. These 21 genotypes were also evaluated for fruit shelf life, weight, firmness, reflectance percentage, chroma index, shape index, pH, titratable acidity, soluble solids content, pericarp width, and number of locules. Polypeptide profiles were polymorphic among ripening stages within genotypes and among genotypes within the ripening stages. Some polypeptides segregated in the Mendelian expected proportion 1:1, and showed genetic linkeage by single point analysis with fruit quality traits. Hence, eight quantitative trait loci (QTLs) associated to number of locules, weight, pH, firmness and fruit shelf life, were detected in this report.

Keywords : Solanum section Lycopersicon; Plant genetic resources; Plant breeding; Molecular markers; QTL (quantitative trait loci).

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