Genetic progress after cycles of upland rice recurrent selection

  • Odilon Peixoto de Morais Júnior Federal University of Goias; Dept. of Genetics and Plant Breeding and Food Engineering; Universidade Federal de Goiás
  • Patrícia Guimarães Santos Melo Federal University of Goias; Dept. of Genetics and Plant Breeding and Food Engineering; Universidade Federal de Goiás
  • Orlando Peixoto de Morais Embrapa Rice and Beans; Embrapa Rice and Beans
  • Adriano Pereira de Castro Embrapa Rice and Beans; Embrapa Rice and Beans
  • Flávio Breseghello Embrapa Rice and Beans; Embrapa Rice and Beans
  • Marley Marico Utumi Embrapa Rondonia; Embrapa Rondônia
  • José Almeida Pereira Embrapa Mid-North; Embrapa Meio-Norte
  • Flávio Jesus Wruck Embrapa Rice and Beans; Embrapa Rice and Beans
  • José Manoel Colombari Filho Embrapa Rice and Beans; Embrapa Rice and Beans

Abstract

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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Published
2015-08-01
How to Cite
Morais Júnior, O., Melo, P., Morais, O., Castro, A., Breseghello, F., Utumi, M., Pereira, J., Wruck, F., & Colombari Filho, J. (2015). Genetic progress after cycles of upland rice recurrent selection . Scientia Agricola, 72(4), 297-305. https://doi.org/10.1590/0103-9016-2014-0137
Section
Genetics and Plant Breeding