DIALELIC ANALYSIS OF NINE TOMATO (Lycopersicon esculentum Mill.) VARIETIES OF DETERMINATED HABIT AND SALADET FRUIT TYPE IN GREENHOUSE CONDITIONS
Juan-Enrique Rodríguez-Pérez, Felipe-Jesús Muñiz-Chavelas, Jaime Sahagún-Castellanos, Natanael Magaña-Lira, Juan Martínez-Solis.
Departamento de Fitotecnia, Universidad Autónoma Chapingo, Chapingo, Estado de Mexico. C.P.56230
To explore the genetic characteristics of nine tomato commercial varieties (Lycopersicon esculentum Mill.) of determinate growth habit and saladet fruit type, were made 72 dialecic crosses according to the method I of Griffing, with the aim to select those which may be suitable to be included in a breeding program. The offspring of the crosses were evaluated in randomized complete block design with three replications, in greenhouse conditions under a hydroponic system. The mesureable variables were: total fruit number, fruit yield, diameter and length fruit and roundness index. The hybrid Ws 40-40, showed the greatest general combinity ability for diameter and length fruit, which can be user for a selectiona breeding program. The greater especific combinity ability effecst for total fruit number, fruit yield, diameter and length fruit were shown by the crosses: Ws 26-26/Ws 40-43, Cortez / Ws 40-43, Cortez /Toro, Toro / Ws 40-43, Toro / Capaya, Yaki / Cortez, Yaki / Ws 40-40 and Ws 40-40 / Capaya. The values of heritability were below 28% indicating that these characters should be improved low selection systems but with limited progress.