Genetic gain prediction of the third recurrent selection cycle in a popcorn population

Antonio Teixeira Do Amaral Júnior,Carlos Alberto Scapim,Ramon Macedo Rangel,Fabrício Santana Santos,Silvério De Paiva Freitas Júnior,Freddy Mora

doi:10.4025/actasciagron.v30i5.3174

Antonio Teixeira Do Amaral Júnior, Carlos Alberto Scapim + Show 4 more

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https://doi.org/10.4025/actasciagron.v30i5.3174

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Abstract

Although Brazil has reduced its importation of popcorn grain in recent years, the availability of improved varieties is still rare. In order to improve a popcorn population and to estimate the prediction of genetic gains, the third cycle of intrapopulation recurrent selection was carried out. One hundred ninety two half-sib families were obtained from the second cycle of the UNB-2U population and tested in a randomized complete block design with two replications within sets in two locations. The presence of statistical significance for sets for grain yield, poorly husked ear and broken plants proved the efficiency and the necessity for the use of the hierarchical statistical model by sets. Except for the poorly husked ear, there was significance for families within sets for the other evaluated traits, showing that there was sufficient genetic variability for exploitation in future cycles. Although the heritability for popping expansion was higher than for grain yield, the predicted genetic gain for the latter was superior to popping expansion because of the higher magnitude of the genetic standard deviation for grain yield. It is expected that in the fifth recurrent cycle, the first popcorn variety with yellow grains may be released for Rio de Janeiro State.

Highlights

In the last five years, the Brazilian popcorn market has changed, especially regarding the partnership between producers and packers, which has been reflected in the importation of the product
The hybrid popcorn market in Brazil is still incipient, in spite of the importance of the crop that is valued at approximately 1.15 billion dollars annually in the United States of America (Pacheco et al, 1998; Galvão et al, 2000)
In the second cycle of recurrent selection of this population (UNB-2U), high values of coefficients of variation (CV) were observed for these traits (Daros et al, 2004)

Summary

Introduction

In the last five years, the Brazilian popcorn market has changed, especially regarding the partnership between producers and packers, which has been reflected in the importation of the product. Until the beginning of the 2003-2004 growing season, national popcorn consumption was approximately 80,000 tons, of which 75% corresponded to imported grains, mainly from Argentina (Galvão et al, 2000). In the 2004-2005 growing season, according to information from the packing companies, there was a marked reduction in importation of the product, to 20,000 tons, as a result of the large-scale use of the IAC-112 modified simple hybrid, developed by the Campinas Agronomic Institute (Sawazaki, 2001). The hybrid popcorn market in Brazil is still incipient, in spite of the importance of the crop that is valued at approximately 1.15 billion dollars annually in the United States of America (Pacheco et al, 1998; Galvão et al, 2000). The variety BRS ANGELA was derived from recurrent selection cycles of the CMS-43 composite, from Embrapa/CNPMS (Pacheco et al, 2000)

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