Genetic variability and recurrent selection in corn population with potential for green corn production

Abstract

The present study selected progenies, aiming at the production of green corn, by methods of intrapopulation recurrent selection with subsequent recombination, generating open-pollinated populations. To this end, in the 2017/2018 second season, progenies from the PMVJ01 population (originated from the recombination of progenies of the TG-02R2 x AG1051 cross) were evaluated, using PMVJ01 and the hybrid AG1051 as controls. The following parameters were evaluated: flowering, heights, green ear yield, husk cover, ear diameter and length, mass yield, ear shape, number of rows on the ear, alignment of rows, color of kernels, and husk width and length. Genetic parameters were estimated, and the gain was predicted with the selection of 20% of the progenies, using the index of Mulamba and Mock in four selection procedures and a fifth by multivariate method. Genetic variability was found in the population, which allows advances in the selection process. After recombination, two of the populations generated showed potential for use as open-pollinated cultivar.

Five cycles of intrapopulation recurrent selection in half-sib progenies of fresh corn

“…14 falker, 208.84 cm, 104.26 cm, 7.85 cm, 19.92 cm, 9,245 kg ha -1 , and 7,651 kg ha -1 , respectively, which denoted the possibility of continuing the breeding program focused on varieties that can occupy this consumer market. Costa et al (2021) evaluated the genetic variability and potential of 167 half-sib progenies of corn with intrapopulation recurrent selection and found heritability values of approximately 23%, 36%, 26%, 46%, 49%, and 46% for plant height, ear height, ear diameter, ear length, yield of ears with husks, and commercial ears, respectively. The results showed lower possibility of yield gains in the first cycle, with similar mean yields (4,580 and 4,864 kg ha -1 ) for ears with and without husks at the initial phase of the program.…”