Abstract
Abstract: The objective of this work was to evaluate the oil content and characters related to fiber quality and yield in cotton lines (Gossypium hirsutum), in order to select genotypes with high oil content and acceptable levels of the other characters. Twenty-two F6 lines and three checks were cultivated in three field trials - two in the municipality of Apodi, in the state of Rio Grande do Norte, and one in the municipality of Barbalha, in the state of Ceará, both in Brazil. The genetic parameters and the genetic gain from selecting 20% of the lines were estimated according to their means in each environment and in the group of environments. Regarding oil content, there is genetic variability, and the selection based on the overall mean is indicated, since this character showed high heritability, with 4.58% expected gain. The lines selected with this criterion have oil contents between 23.52 and 24.51%, which are higher than those of the Brazilian cultivar BRS Aroeira with the highest grain oil content (22.04%).
Highlights
Cotton (Gossypium hirsutum L.) is cultivated mainly due to its fiber, but its seed is an important by-product of processing, since it is the second main source of vegetal oil worldwide (Ashokkumar & Ravikesavan, 2008)
The genetic variability for oil content in cotton is widely reported in the literature
The objective of this work was to evaluate the oil content and characters related to fiber quality and yield in cotton lines, in order to select genotypes with high oil content and acceptable levels of the other characters
Summary
Cotton (Gossypium hirsutum L.) is cultivated mainly due to its fiber, but its seed is an important by-product of processing, since it is the second main source of vegetal oil worldwide (Ashokkumar & Ravikesavan, 2008). The edible cotton oil has high thermal stability and a health-beneficial combination of fatty acids, with balanced amounts of omega 3 and 6, as well as vitamins A, D, and E (Ashokkumar & Ravikesavan, 2011). Due to its good properties and the high demand for cottonseed oil, the increase in oil content should be sought in cotton breeding programs, together with yield characters and fiber properties. Others obtained moderate to high heritability in the broad sense and reduced heritability in the narrow sense for oil content in the seed (Azhar & Ajmal, 1999; Azhar & Ahmad, 2000; Khan et al, 2007).
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