Selection of cotton genotypes for greater length of fibers

Luiz Paulo De Carvalho,Francisco José Correia Farias,Camilo De Lellis Morello,Paulo Eduardo Teodoro

doi:10.1590/1984-70332016v16n4n50

Abstract

Abstract In cotton breeding programs, it is necessary to identify genotypes with predictable behavior on the length of fibers, and which are responsive to environmental variations, in specific or broad conditions. The aim of this study was to employ the methodology of mixed models for simultaneous selection of cotton genotypes with greater length of fibers, adaptability and stability. It was evaluated 36 lines in three trials located in Apodi (2013 and 2014) and Santa Helena (2013,) in a randomized block design with two replications. Genetic parameters were estimated by the restricted maximum likelihood/best linear unbiased predictor method (REML/BLUP) and the selection was based on the method of harmonic mean of the relative performance of genetic values. The genotypes CNPA 2012-55, CNPA 2012-58, CNPA 2012-62 and CNPA 2012-64 can be grown in all tested environments, since they gather greater length of fibers, stability and adaptability.

Highlights

Upland cotton (Gossypium hirsutum L.r. latifolium Hutch.) produces one of the most important textile fiber of the world, and offers various utility products with great relevance in the Brazilian and the world’s economy (Carvalho et al 2015a, Menezes et al 2015, Morello et al 2015)
Changes in spinning technology, competition with synthetic fibers, and the globalization of cotton production and textile products increase the demand for higher quality fiber, making the length of fiber one of the main traits to be improved (Smith et al 2008, Carvalho et al 2016)
Adaptability and phenotypic stability analysis are necessary, by which it is possible to identify genotypes with predictable behavior on the length of fibers, and which are responsive to environmental variations

Summary

Introduction

Upland cotton (Gossypium hirsutum L.r. latifolium Hutch.) produces one of the most important textile fiber of the world, and offers various utility products with great relevance in the Brazilian and the world’s economy (Carvalho et al 2015a, Menezes et al 2015, Morello et al 2015). Changes in spinning technology, competition with synthetic fibers, and the globalization of cotton production and textile products increase the demand for higher quality fiber, making the length of fiber one of the main traits to be improved (Smith et al 2008, Carvalho et al 2016). Genotype x environment interaction (G x E) is one of the greatest challenges in plant breeding, both in the selection procedures and in the recommendation of cultivars, and plant breeders usually look for stable genotypes with improved performance in relation to a particular trait (Ramalho et al 2012, Cruz et al 2014). Selection methods that incorporate stability and adaptability in a single statistics can be considered superior, when compared with those which use only yield as selection criteria (Resende 2007)

Objectives

Methods

Results