GENOTYPE BY ENVIRONMENT INTERACTION IN GREEN COWPEA ANALYZED VIA MIXED MODELS

José Torres Filho,Christiane Noronha Gomes Dos Santos Oliveira,Lindomar Maria Da Silveira,Glauber Henrique De Sousa Nunes,Antônio José Rodrigues Da Silva,Matheus Felipe Nogueira Da Silva

doi:10.1590/1983-21252017v30n317rc

José Torres Filho, Christiane Noronha Gomes Dos Santos Oliveira + Show 4 more

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https://doi.org/10.1590/1983-21252017v30n317rc

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Journal: Revista Caatinga	Publication Date: Sep 1, 2017
Citations: 18	License type: cc-by

Affiliation: Universidade Federal Rural do Semi-Árido

Abstract

ABSTRACT The restricted maximum likelihood/best linear unbiased prediction (REML/BLUP) mixed model method has been used to study the effects of genotype by environment interaction (G x E) in various crops including cowpea. This work aimed to analyze the G x E interaction via mixed models to identify cowpea genotypes that meet high adaptability, stability and productivity of pods and green grains when grown under Mossoró, Rio Grande do Norte State conditions. Crop value and use were evaluated in two growing seasons, using randomized complete blocks design with 23 genotypes and four replications. The genetic parameters were estimated by the REML/BLUP procedure and selection was based on the harmonic mean of the relative performance of genetic values (HMRPGV). Agreement between the HMGV, relative performance of genotypic values (RPGV) and HMRPGV statistics, provided genotype discrimination. Furthermore, the HMRPGV results enabled the simultaneous selection of superior genotypes for productivity, adaptability and stability. For the productivities of pods and green grains, the most notable genotypes were the cultivars BRS Xiquexique and BRS Aracê, and the line MNC05-835B-15, which showed a high productivity of grains, adaptability and stability, and could be grown in the two growing seasons considered in the study.

Highlights

Cowpea [Vigna unguiculata (L.) Walp.], an African leafy vegetable, was introduced in Brazil by the State of Bahia after it was brought in by Portuguese settlers in the middle of the sixteenth century
The production of cowpea is more concentrated in northeastern Brazil, in semi-arid areas, where other annual legumes do not develop satisfactorily due to irregular rainfall and high temperatures (FREIRE FILHO, 2011)
An alternative to studying the adaptability and stability of genotypes is the method of harmonic mean relative performance of genotypic values (HMRPGV), advocated by Resende (2004)

Summary

INTRODUCTION

Cowpea [Vigna unguiculata (L.) Walp.], an African leafy vegetable, was introduced in Brazil by the State of Bahia after it was brought in by Portuguese settlers in the middle of the sixteenth century. The production of cowpea is more concentrated in northeastern Brazil, in semi-arid areas, where other annual legumes do not develop satisfactorily due to irregular rainfall and high temperatures (FREIRE FILHO, 2011) Even though these factors are limiting for many crops of economic interest, it does not prevent the cultivation of cowpea, which, besides tolerating these climatic conditions, presents a low cost of production compared to other species of economic interest in the region. There has been an increase in the application of mixed models to various themes of plant breeding of annual crops, such as in the analysis of the G x E interaction In this context, an alternative to studying the adaptability and stability of genotypes is the method of harmonic mean relative performance of genotypic values (HMRPGV), advocated by Resende (2004). The objective of this work was to analyze the G x E interaction in green cowpea via mixed models and to identify genotypes that combine high grain productivity, adaptability and stability, in Mossoró, Rio Grande do Norte (Brazil)

MATERIAL AND METHODS

Findings

CONCLUSIONS