Selection of cotton lines for high oil content

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 F 6 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%).Index terms: Gossypium hirsutum, gain from selection, genotype x environment interaction, indirect selection, seed quality. Seleção de linhagens de algodão para alto teor de óleoResumo -O objetivo deste trabalho foi avaliar o teor de óleo e os caracteres relacionados à qualidade e ao rendimento de fibra em linhagens de algodão (Gossypium hirsutum), para selecionar materiais com alto teor de óleo e níveis aceitáveis dos demais caracteres. Vinte e duas linhagens F 6 e três testemunhas foram cultivadas em três ensaios de campo -dois em Apodi, RN, e um em Barbalha, CE. Os parâmetros genéticos e o ganho com a seleção de 20% das linhagens foram estimados de acordo com suas médias em cada ambiente e no conjunto de ambientes. Quanto ao teor de óleo, há variabilidade genética, e a seleção com base na média geral é indicada, pois, esse caráter apresentou elevada herdabilidade, com ganho esperado de 4,58%. As linhagens selecionadas por este critério apresentam teores de óleo entre 23,52 e 24,51%, superiores aos da cultivar brasileira BRS Aroeira com maior teor de óleo no grão (22,04%).Termos para indexação: Gossypium hirsutum, ganho de seleção, interação genótipo x ambientes, seleção indireta, qualidade da semente.

Seed Oil Content, Yield and Fiber Quality Traits in Some Egyptian Cotton Genotypes

“…Seed index was highly significant correlated with both seed oil content and seed oil index. Similar significant positive or negative correlations between oil content in cottonseed and other plant attributes were obtained by Ashokkumar and Ravikesavan, 2011, Munawar and Malik, 2013, Abd El-Moghny et al 2015, Hinze et al, 2015, Kothari et al, 2016and de Carvalho et al, 2017 To sum, selection for high yield potential may be achieved throughout selection for boll weight and lint %, while fiber traits must be selected separately for each trait. Seed oil content and seed oil index may be improved throughout selection for seed index, fiber strength and length uniformity index in cotton breeding program.…”

Cottonseed Protein, Oil, and Mineral Nutrition in Near-Isogenic <i>Gossypium hirsutum</i> Cotton Lines Expressing Leaf Color Phenotypes under Field Conditions

“…However, the variation between checks in the three locations was smaller; ranged from 22.93% to 25.93%, 20.4% to 21.3%, and 19.4% to 19.8%, respectively. They indicated that a wide range of variability between lines, and between lines and checks, and between environments may be due to G × E interactions [70]. Our research showed wide averages; for example, the averages across two years ranged from 24% to 27% for protein and 10% to 30% for oil, and similarly for nutrients such as N, and minerals such as P, K, B, Fe, and Ni.…”

“…A study was conducted on genetic variability, heritability, genetic gain and correlations for cottonseed soil in eight G. hirsutum cultivars and found significant differences among the genotypes for seed oil, which ranged from 27.52% to 30.15%, and a negative correlation was found between oil and yield [69]. Others evaluated oil content in 22 F 6 cotton lines (G. hirsutum) and found that there is genetic variability, and the overall mean oil content ranged between 23.52% and 24.51%, and they are higher than those of the Brazilian cultivar BRS Aroeira that have oil content of 22.04% [70]. They also repeated that the analysis of variance in each environment showed differences between the oil contents of the 22 lines.…”

Selection of upland cotton for the Brazilian semi-arid region under supplementary irrigation

“…However, due to the simultaneous selection, fiber gains were lower since the experiment prioritized traits related to yield and micronaire, which are the most important for the crop. Carvalho et al (2017) evaluated 22 cotton lines in two environments in the semi-arid region of the Northeast and also reported low genetic gain for fiber length (0.26%), indicating the greater difficulty in the selection of this trait, mainly due to its negative correlation with micronaire. Conversely, strength was high (1.87%), demonstrating that the population and environmental conditions (site and irrigation system) provided a better result.…”