TITLE:
Genetic and Phenotypic Parameters in the Selection of Upland Rice Genotypes
AUTHORS:
Camila Soares Cardoso da Silva, Flávia Barbosa Silva Botelho, Cinthia Souza Rodrigues, Marcela Pedroso Mendes, Amanda Mendes de Moura, Antônio Rosário Neto
KEYWORDS:
Lines, Plants Breeding, Preliminary Trial, Oryza sativa
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.8 No.13,
December
22,
2017
ABSTRACT: To assist in upland rice breeding programs,
estimated genetic and phenotypic parameters are extremely important in the
selection of superior lines. Thus, the objective of this study was estimate the
genetic and phenotypic parameters of upland rice lines of the breeding program
of UFLA in partnership with Embrapa Arroz e Feijao and Epamig. The experiment
was installed in an experimental area of the Department of Agriculture at UFLA.
It was evaluated 36 upland rice lines of the preliminary trial of the 2014/15
season, in randomized blocks, with three replications and plots consisted of
five rows and each row has four meters. For this, it was evaluated the
characters: plant height (cm), yield (kg·ha-1), 100-grain
weight, days until flowering, percentage of filled grains and rice blast
severity. The variance analysis and genetic parameters were estimated using the
software SAS. To evaluate the experimental precision was estimated the
accuracy, which varied between 63% and 98%, showing experimental precision, moderate to high. The lines
differed significantly for all characters, meaning there is genetic variability among
genotypes evaluated. With intensity of selection of 10% of lines, it was obtained
a genetic gain of 325.29 kg·ha-1 in the character
productivity, a plant height (cm) reduction in 5.50 cm, and days until
flowering, with a reduction of 9.23 days, with selection of earlier plants. The
estimated values for heritability ranged from 38% - 96%. Estimates confirm the possible
success with the selection of the upland rice lines for these characters.