ESTIMATES OF GENETIC PARAMETERS FOR SELECTION OF COLORED COTTON FIBER1

Rommel Raphael Santos De Albuquerque,Luiz Paulo De Carvalho,Francisco José Correia Farias,José Jaime Vasconcelos Cavalcanti,Damião Raniere Queiroz

doi:10.1590/1983-21252020v33n127rc

Rommel Raphael Santos De Albuquerque, Luiz Paulo De Carvalho + Show 3 more

Open Access

https://doi.org/10.1590/1983-21252020v33n127rc

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Abstract

ABSTRACT Naturally-colored cotton fiber has received attention from breeding programs in the semiarid region of northeastern Brazil due to an increased interest in its fibers. Therefore, this study aimed to select genotypes of colored cotton fiber for agronomic and technological fiber characteristics for the Brazilian semi-arid conditions. The experiment was carried out in two environments (Patos-PB and Apodi-RN) in Brazil during the 2016 growing season. The experimental design was in randomized blocks with four replications. Treatments consisted of eleven colored fiber genotypes and three controls (BRS Topázio, BRS Rubi, and BRS Verde). The following traits were assessed: seed cotton yield (SCY, kg ha-1), lint percentage (LP, %), lint length (LEN, mm), lint strength (STR, gf tex-1), and lint micronaire (MIC, µg in-1). The data were submitted to individual and joint variance analyses, and means were grouped by the Scott and Knott (1974) test at 0.05 probability. Genotypes showed variability in all traits, which allows genetic gains in subsequent cycles of selection. The genotypes BRS Topázio, CNPA 2002 10245, and CNPA 2002 10327 presented the best estimates for the assessed traits, thus they can be selected for future studies in cotton breeding programs in the semiarid region.

Highlights

Herbaceous cotton (Gossypium hirsutum L.) is among the three most important crops in Brazilian agribusiness
In Brazil, fiber production has always been based on the cultivation of white cotton fiber, with a large number of cultivars with great productive potential and excellent fiber quality
Cotton breeding programs in the twentieth century were directed at white cotton fiber, while those of colored fiber have been used only by hand or as an ornamental plant (CARVALHO et al, 2015a)

Summary

Introduction

Herbaceous cotton (Gossypium hirsutum L.) is among the three most important crops in Brazilian agribusiness. Brazil stands out as the world’s fourthlargest producer and third largest exporter of cotton (FREIRE et al, 2015; ABRAPA, 2017; FAO, 2018; USDA-FAS, 2018). The Brazilian Midwest is the largest producer, followed by the Northeast region. For both regions in the 2017/2018 growing season, production estimates were over 200 thousand tons (CONAB, 2018). In Brazil, fiber production has always been based on the cultivation of white cotton fiber, with a large number of cultivars with great productive potential and excellent fiber quality. Cotton breeding programs in the twentieth century were directed at white cotton fiber, while those of colored fiber have been used only by hand or as an ornamental plant (CARVALHO et al, 2015a)

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