Adaptability and stability of early carioca beans by mixed models

Thalyson Vasconcelos Lima,Katiane Da Rosa Gomes Da Silva,Paulo Ricardo Dos Santos,Tâmara Rebecca Albuquerque De Oliveira,Kleyton Danilo Da Silva Costa,José Wilson Da Silva,Emmanuelle Rodrigues Araújo,Antônio Félix Da Costa,Maxwel Rodrigues Nascimento,Thiago Lívio Pessoa Oliveira

doi:10.14393/bj-v36n0a2020-48288

Abstract

The genotype x environment interaction represents one of the major selection challenges due to the difficulty in identifying effectively superior genotypes. The present study aimed at estimating genetic parameters and selecting genotypes of early Carioca beans by analyzing simultaneous attributes, including yield, adaptability, and stability. In the agricultural year of 2015 and 2016, three trials were conducted, using a randomized block design, with three repetitions each, in the Agreste and Sertao regions of Pernambuco State. The genetic parameters were estimated using the mixed model procedure, and the selection was based on the harmonic mean of the relative performance of genetic values (MHPRVG, abbreviation in Portuguese) method. The environments influenced the phenotypic expression of the bean genotypes during both years, setting a specific adaptation. The mean heritability of the genotypes regarding yield exhibited low magnitude values in the trials of 2015 (5.78%) and 2016 (13.77%), indicating costly conditions for the selection of the improved genotypes. Genotype CNFC 15856 was selected, considering the genetic gain predicted for yield, by the average and specific performance in the three environments, and by the simultaneous attributes of yield, adaptability, and stability. The MHPRVG method enables the optimized selection of genotypes considering yield, stability, and adaptability; therefore, it should be included in the recommended selective criteria for agronomically superior genotypes in commercial plantations.

Highlights

Common bean (Phaseolus vulgaris L.) is one of the most significant and traditional crops in Brazil and is primarily cultivated by small family farmers
The experimental coefficient of variation was 31.82% for the experiments with early Carioca beans evaluated in 2015 and 21.25% for the genotypes analyzed in 2016 (Table 3). These values are regarded as of high magnitude due to grain yield, such estimates are expected since the characteristic is strongly influenced by local edaphoclimatic conditions (RAMALHO et al, 2012)
Environments, and the genotype x environment interaction for the Carioca bean evaluated in 2015 and 2016 were significant at 1% of probability, by the Chi-square test, respectively (Table 3). These results indicate that the genotypes of the early Carioca bean group differed genetically for grain yield potential and presented a different response to the environments where they were evaluated

Summary

Introduction

Common bean (Phaseolus vulgaris L.) is one of the most significant and traditional crops in Brazil and is primarily cultivated by small family farmers. This crop has performed an important social role, as it provides work and income in rural areas. The Brazilian bean yield has not been large enough to meet the domestic market demand (CONAB, 2020). According to Vieira (2006), several biotic and abiotic problems affecting bean crops have been reported and should be the subject of breeding programs, with emphasis on grain yield. Bean breeding programs play a leading role and take up the challenges of developing new cultivars for higher grain yields and reducing bean imports from abroad

Methods

Results

Conclusion