Effectiveness of selection, parent-offspring correlation and regression in bacterial blight resistance genes introgressed rice segregating population

Efetividade da seleção, correlação pais-prole e regressão nos genes de resistência à ferrugem bacteriana introgressaram a população segregante de arroz

ABSTRACT:

The effectiveness of early generation selection was practiced in bacterial blight resistance genes introgressed F₂ and F_2:3 population of the cross CB 174 R × IRBB 60 in rice. F₂ Selection have been proved to be robust and effective tool in crop improvement program. Selection differential was positive for all studied traits. Selection response was high for number of grains, thus indicating the effectiveness of selection for these character. Realized heritability was found high for number of grains and thousand grain weight, suggested that direct selection was effective. Expected selection response and predicted genetic gain was high for number of grains. Parent-offspring correlation showed low but significance association for number of productive tillers (r=0.47^**, P<0.01), single plant yield (r=0.35^**, P<0.01) and (r=0.30^*, P<0.05) panicle length in F₂ and F_2:3 generation indicates that selection was fruitful in early generation. Statistically regression coefficient was not significant linear dependence of the mean of F₂ and F_2:3 generation.

Key words:
selection response; realized heritability; selection differential