Genetic progress estimation strategy for upright common bean plants using recurrent selection.
Common bean producers in Brazil tend to grow plants as upright as possible. Because the control of this trait involves a large number of genes, recurrent selection (RS) is the best approach for successful plant improvement. Because plant architecture (PA) is evaluated using scores and usually has high heritability, RS for PA is performed through visual selection in generation S0. The aim of the present study was to evaluate selection progress and investigate whether this progress varies with the number of selected progenies or the generation evaluated. In addition, the effect of RS for the upright (PA) trait on progeny grain yield (GY) was investigated. Data of progenies S0:3and S0:4of the fifth, eighth, and twelfth cycles were used. A combined analysis of variance was performed using the adjusted means of the 47 best progenies from each generation and cycle, using two control cultivars as reference. A joint analysis of the two generations used during the evaluation of progenies for the different cycles was also performed. The genetic progress (GP) was estimated by fitting a linear regression equation to the relationship between the adjusted mean of each cycle and the number of cycles. We found that RS was efficient and the estimated GP of the evaluated progenies was 4.5%. Based on the GY heritability estimates, in more advanced generation selection for GY can be successfully performed on progenies. Thus, the selection already done for PA in F2could be associated to the most productive progenies.
Departamento de Biologia, Universidade Federal de Lavras Federal, Lavras, MG, Brasil andrade.lais@gmail.com.
L A
LA
Pereira
Embrapa Arroz e Feijão, Goiânia, GO, Brasil.
A F B
AF
Abreu
Departamento de Biologia, Universidade Federal de Lavras Federal, Lavras, MG, Brasil.
I C Vieira
IC
Júnior
Departamento de Agricultura, Universidade Federal de Lavras, Lavras, MG, Brasil.
L P M
LP
Pires
Departamento de Biologia, Universidade Federal de Lavras Federal, Lavras, MG, Brasil.
M A P
MA
Ramalho
D001938:Brazil; D018556:Crops, Agricultural / Q000235:genetics; D003433:Crosses, Genetic; D014644:Genetic Variation; D027805:Phaseolus / Q000033:anatomy & histology* / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D000069600:Plant Breeding / Q000379:methods; D012641:Selection, Genetic