Genetic progress after cycles of upland rice recurrent selection
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Data
2015-08
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Resumo
Periodic assessment of the genetic progress made in recurrent selection programs
is essential for assessing the evolution of the programs and identifying the main factors that have
contributed to this progress. This study aimed to estimate genetic progress in grain yield, plant
height and days-to-flowering achieved in the CNA6 population of upland rice (Oryza sativa L.),
after four cycles of recurrent selection; and evaluate the genetic potential of this population to
generate superior inbred lines after each selection cycle. The experimental data were obtained
from progeny yield trials of each recurrent selection cycle. These trials were carried out in two
or three locations per cycle, and consisted of S0:2 progenies and at least three checks. Federer’s
augmented block design, with one replication on location (the environment), was adopted.
Results revealed genetic progress for grain yield and plant height, with total genetic gains of
375.87 kg ha−1 and -3.90 cm, respectively, during the four selection cycles. The annual relative
gain observed for grain yield was 1.54 %. The genetic potential of the population was analysed
by the expected proportion of superior inbred lines. The standard adopted as the limit for obtaining
superior inbred lines was the average of the checks for each trait. The genetic potential for
grain yield and plant height increased during the study period. For days-to-flowering, no genetic
gain occurred; however, the genetic potential of the population to generate superior inbred lines
for this trait was maintained after the selection cycles.
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BLUE, Population breeding, BLUP, Mixed model
Citação
MORAIS JÚNIOR, Odilon Peixoto de et al. Genetic progress after cycles of upland rice recurrent selection. Scientia Agricola, Piracicaba, v. 72, n. 4, p. 297-305, 2015.