Abstract
ABSTRACT The objective of this work was to estimate the predicted genetic gains with the simultaneous selection of agronomic and technological traits from elite cotton lines using selection indexes. Data from the evaluation of 36 elite lines were evaluated in three trials located in Apodi-RN in 2013 and 2014 and Santa Helena, GO, Brazil in 2013, in a randomized block design with two replicates. The agronomic traits evaluated were: plant height (PH), average boll weight (ABW), percentage of fibers (PF) and seed cotton yield (YIE). In 20 bolls from each experimental unit, the following technological fiber traits were evaluated: fiber length (UHM), fiber uniformity (UNIF), short fiber index (SFI), fiber strength (FS), elongation (ELON), micronaire (MIC), reflectance (RD) and degree of yellowing (+b). Smith and Hazel, Pesek and Baker and Mulamba and Mock selection indexes were tested for selection of the seven superior genotypes, assigning the coefficients of genetic variation (CVg) as economic weight. There were no interaction between genotypes and environments for any of the evaluated traits. Smith and Hazel index resulted in negative gains for fiber length and positive for the traits whose reduction is of interest, such as plant height, micronaire and degree of yellowing. Pesek and Baker index provided positive predictive gains for all traits of interest. However, it promoted reduction only to the degree of yellowing. Mulamba and Mock presented satisfactory gains, being the most suitable for selecting genotypes aiming at simultaneous gains in yield and fiber technological components.
Highlights
Upland cotton (Gossypium hirssutum L.r. latifolium Hutch.) produces one of the most important world’s textile fibers, being one of the main crops of economic importance in Brazil (Carvalho et al 2015a)
Aiming at becoming competitive in the global cotton market, dominated by the United States, whose fiber is of excellent quality, Brazilian breeding programs seek the selection of genotypes with longer fibers, greater resistance during spinning and baling, decreasing of the short fibers content, greater uniformity of length and mature fibers
Negative correlation among fiber strength and short fiber content were reported by Ulloa (2006)
Summary
Upland cotton (Gossypium hirssutum L.r. latifolium Hutch.) produces one of the most important world’s textile fibers, being one of the main crops of economic importance in Brazil (Carvalho et al 2015a). Agronomic traits evaluated were: plant height (PH, cm), average boll weight (ABW, g), percentage of fibers (PF, %) and seed cotton yield (YIE, kg·ha-1).
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
