Progresso genético do programa de seleção recorrente para produtividade de grãos de feijoeiro-comum da EMBRAPA
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2018-09-28
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Universidade Federal de Goiás
Resumo
The advantage of using recurrent selection is the increase of favorable alleles
without significant loss of genetic variability present in the population. The
objectives of this study were to estimate the genetic progress in two cycles of
recurrent selection for grain yield, lodging resistance, plant architecture and
commercial quality of grains and to study the adaptability and stability of the
progenies of the two selective cycles. The 19 best progenies of cycle 0 (C0)
and 20 of cycle 1 (C1) and three controls (BRS Cometa, BRS Pontal and BRS
Estilo) were evaluated in nine environments. The 42 treatments were
arranged in randomized blocks, with three replications. The plots consisted of
two lines of four meters and spacing of 45 cm between rows. The estimated
genetic progress (PG) was obtained based on the comparison of the means of
the progenies selected in each cycle. Genetic variability was verified between
the progenies of the two cycles for all evaluated characters. Genetic progress
for grain yield was 11.5% (1.9% per year), plant architecture and lodging
resistance 5.8% (0.9% per year) and 14% (2.3% per year), respectively.
Regarding the commercial quality of grains, the genetic progress was 4.2%
(0.7% per year), 1.9% (0.6%) 4.4% (0.73% per year) for mass of 100
grains, sieve yield and grain color score, respectively. It was also verified
greater phenotypic stability of C1 progenies in relation to C0. These results
prove the efficiency of the recurrent selection program in obtaining genetic
gains for several complex inheritance characters.
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FARIAS, F. C. Progresso genético do programa de seleção recorrente para produtividade de grãos de feijoeiro-comum da EMBRAPA. 2018. 53 f. Dissertação (Mestrado em Genética e Melhoramento de Plantas) - Universidade Federal de Goiás, Goiânia, 2018.