Maraiza Lima Costa
AUTHOR: Maraiza Lima Costa
TITLE: GENETIC VARIABILITY AND RECURRENT SELECTION IN CORN POPULATION WITH POTENTIAL FOR GREEN CORN
ADVISOR: Prof. Dr. Edésio Fialho dos Reis, Co-advisor: Dr. Willame dos Santos Candido
APPROVAL DATE: 02/28/2020
Abstract
Green maize has an important role in human nutrition and is a common activity among small producers who in many cases do not have quality seeds suitable for this purpose. Thus, the objective was to select progenies, capable of producing green corn, recombine them, and generate open pollination populations, accessible to producers. Therefore, in the 2017/18 off-season, 167 progenies from the crossing TG-02R2 X AG1051 were evaluated; in a Lattice 13x13 arrangement, the open pollination population (TG-02R2) and the hybrid (AG1051) being witnesses. The following were evaluated: female and male flowering, height of plants and ears, productivity with and without straw, stuffing, diameter and length of ears, mass yield, shape of ears, number of rows, row alignment and grain color. Straws were evaluated for width and length. The data were submitted to Analysis of Variance and the genetic parameters were estimated, in addition to the genetic gain predicted with the selection of approximately 20% of the progenies, forming 4 different populations, based on the Mulamba & Mock 1978 index and a fifth population using the method UPGMA grouping. The 5 populations were recombined and tested in the second harvest 2018/19, in a randomized block design; in an adjacent experiment the genetic variability of the population was verified 5; for both experiments, basically the same evaluation criteria were considered. It was concluded that two of the populations generated were similar to the control hybrid, suggesting the possibility of using them; and that population 5 has genetic variability that can be explored in a subsequent recurrent selection cycle.
