Abstract

PENA-LOMELI, Aureliano; RIOS-HERNANDEZ, Nelson Eduardo; SANTOS-MORENO, Oscar  and  MAGANA-LIRA, Natanael. Genetic parameters of the Gema population of husk tomato (Physalis ixocarpa Brot. ex Horm.). Rev. Chapingo Ser.Hortic [online]. 2020, vol.26, n.2, pp.83-94.  Epub May 15, 2020. ISSN 2007-4034.  https://doi.org/10.5154/r.rchsh.2019.09.019.

The Gema population of the husk tomato (Physalis ixocarpa Brot. ex Horm.) is the result of selection towards very large fruit from F1 of the intervarietal crossing of Verde Puebla and CHF1-Chapingo. After six selection cycles, genetic variance and heritability are likely to have decreased, which could make genetic improvement difficult. The aim of this study was to determine (through heritability [ĥ 2 ], the coefficient of additive genetic variation [CV A] and the additive genetic correlation) whether it is possible to continue with the genetic improvement of the Gema population. Four quantitative traits were studied in 200 families, obtained from the Gema population, under a randomized complete block experimental design with three replications and 22 plants per experimental unit. The CV A ranged from 18.08 to 29.32 %, and the ĥ 2 fluctuated between 32.03 and 44.14 %. The highest ĥ 2 was found in yield per plant, whose 1-α confidence interval for ĥ 2 was estimated to be between 29.2 and 56.3 % (α = 0.05). High, positive and significant additive genetic correlations were found between number of fruits per plant and yield per plant. Therefore, it is possible to obtain significant advances by selection in the Gema variety. The greatest gain could be obtained for yield per plant and number of fruits, with emphasis on the first trait.

Keywords : heritability; coefficient of additive genetic variation; additive genetic correlation; phenotypic correlation; additive variance.