Genetic gain of ‘Valenciana’ onion populations developed in the Brazilian Semi-Arid region

Genetic gain of ‘Valenciana’ onion populations developed in the Brazilian Semi-Arid region

The aim of the present study was to estimate the genetic improvement in the last recurrent selection cycles applied in two ‘Valenciana’ onion populations in Petrolina, PE. The experiments were carried out between October 2014 and January 2015, in Petrolina and Juazeiro, BA. The experiment consisted...

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Published in:Crop breeding and applied biotechnology Vol. 17; no. 2; pp. 168 - 174
Main Authors: Oliveira, Antonio Esmael Silva de, Santos, Carlos Antônio Fernandes, Luz, Lucas Nunes da, Oliveira, Valter Rodrigues, Candeia, Jonas Araújo, Carvalho Filho, José Luiz Sandes de
Format: Journal Article
Language:English
Published: Vicosa Crop Breeding and Applied Biotechnology 01-06-2017
Brazilian Society of Plant Breeding
Subjects:
AGRONOMY
Allium cepa
Arid regions
Arid zones
BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Genetic drift
Genetic improvement
genetic progress
Heritability
Populations
recurrent selection
Semiarid environments
Allium cepa
genetic progress
recurrent selection
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Summary:The aim of the present study was to estimate the genetic improvement in the last recurrent selection cycles applied in two ‘Valenciana’ onion populations in Petrolina, PE. The experiments were carried out between October 2014 and January 2015, in Petrolina and Juazeiro, BA. The experiment consisted of a randomized block design, with 12 treatments and three replications. Analyses of variances were carried out separately for each population. The control population CNPH6400 was the comparison basis. Heritability and genetic gain were estimated for total (Prototal) and commercial (Procom) bulb yields. Significant differences were observed for Prototal and Procom in both populations and in both environments, except for the 25CA10 population, in Juazeiro. The highest Procom genetic gains were observed in Petrolina for 25CA10 and T811CR13 populations (510.5% and 522.1%, respectively), proving the efficiency of recurrent selection cycles. Genetic gains were nonlinear, and fluctuations may have occurred due to genetic drift.
ISSN:1984-7033
1518-7853
1984-7033
DOI:10.1590/1984-70332017v17n2n25