Genetic gains in the UENF-14 popcorn population with recurrent selection

Effect of recurrent selection on the variability of the UENF-14 popcorn population

“…When observing the unfoldings for these two characteristics, it is noted that for PE there was no significance at 5% probability, and for GY, only three of the seven cycles expressed significance of 5% probability. Similar results were obtained on the seventh recurrent selection cycle with full-sib families, in which Freitas et al (2014) identified significance of 1% probability for GY and no significance for PE. Table 2 shows that popping expansion expressed high values for heritability and for variation index.…”

“…Considering that the Popcorn Improvement Program of UENF started from different breeding strategies (Mass Selection for C 0 cycle; Selection of Full-sib families from C 0 cycle for C 1 cycle; Selection of S 1 families from C 1 cycle for C 2 cycle; Selection of half-sib families from C 2 cycle for C 3 cycle; and Selection of full-sib families for the other cycles), and considering the link between the different strategies, the varied responses of gain with selection -noted in the works of Oliveira et al (2010) and Freitas et al (2014), it is evident the doubt in relation to the genetic bottleneck in UENF-14 population after seven cycles (C 0 a C 6 ) of recurrent selection.…”

Recurrent selection of popcorn composites UEM-CO1 AND UEM-CO2 based on selection indices

“…For this the economic weights were determined as CVg and 1 for PE and 1 for GY, in cycle C 1 of composite UEM-Co1- (Table 2) and in C 0 of UEM-Co2 (Table 3). The use of this index was also effective in popcorn breeding of the germplasm studied by Vilarinho et al (2003), Santos et al (2007), Freitas Júnior et al (2009), Amaral Júnior et al (2010, Rangel et al (2011), Ribeiro et al (2012 and Freitas et al (2014).…”

Proposal of a super trait for the optimum selection of popcorn progenies based on path analysis

“…This selected population was backcrossed three times with the 'American' popcorn variety. The present-day population 'UNB-2U' has been improved via recurrent intrapopulation selection, leading to the accumulation of favorable alleles in the population in its seventh selection cycle (Pereira and Amaral Júnior, 2001;Freitas et al, 2014).…”