GENETICAL ANALYSIS FOR F1 AND F2 GENERATION IN SOME EGYPTIAN COTTON CROSSES (Gossypium barbadense L.)

Nazmey, M.; Eissa, Asmaa; Yehia, W. M. B.

doi:10.21608/jacb.2010.89498

Cited by 3 publications

(3 citation statements)

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“…Therefore, selection based on the first opening flower was more effective for improving this trait and selecting the best genotypes with the earliest first opening flower date. The results showed that direct selection for lint percentage would be favorable for breeding programs for this trait, these results agree with those obtained by [2,[38][39][40][41][42][43].…”

Section: Discussionsupporting

confidence: 89%

Sensitivity of Cotton <em>Gossypium barbadense</em> L. to Various Selection Criteria for Yield, Yield Components, and Earliness Attributes

Aty¹,

Sorour²,

Kotb³

et al. 2022

Preprint

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Competition between cotton, winter, and summer crops is the greatest obstacle for plant breeders in Egypt. Breeders are thus seeking early maturing, high-yielding cultivars that are suited for planting following winter crops. This study was conducted during the 2016 and 2018 growing seasons at the Sakha agriculture research station, Egypt's agricultural research facility. This research used breeding material from the F2, F3, and F4 generations that resulted from crossing Giza 94 and Uzbekistan. During the 2016 growing season, the F2 population was cultivated, and the top 5% of the F2 population (75 plants) were chosen based on the selection criteria. In the summer of 2017, the F3 families were cultivated, and 5% of the superior F3 families were chosen to become the F4 fam-ilies, which were planted in the summer of 2018 at the single plant and bulk studies in a randomised full block design with three replications. The average performance of the characteristics boll weight, seed cotton yield, lint percentage, and lint index increased as generations passed from F2 to F4. In the meanwhile, the characteristic value of the first flower to open decreased, showing the accu-mulation of advantageous alleles. For all examined characteristics, the phenotypic coefficient of variance was greater than the genotypic coefficient of variation. In addition, the data demonstrated that heritability in a broad sense was greater in F4 populations than in F3 and F2 populations. With a few exceptions, the phenotypic and genotypic associations for all investigated characteristics were positive and very significant. According to the data, initial opening flowering and boll weight had a substantial impact on seed cotton output per feddan. In general, five superior families No. 9, 13, 18, 19, and 20 were chosen from the F4 population, which were more significant for yield and yield component than the commercial variety, and these genotypes may be promising for the breeding programme to develop new genotypes with superior yield.

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Section: Discussionsupporting

confidence: 89%

Sensitivity of Cotton <em>Gossypium barbadense</em> L. to Various Selection Criteria for Yield, Yield Components, and Earliness Attributes

Aty¹,

Sorour²,

Kotb³

et al. 2022

Preprint

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show abstract

“…Thus, the correlation analysis provides an excellent index to predict the corresponding change in one character at the expanse of the proportionate change in the other coefficient of phenotypic and genotypic correlations among different character combinations. Generally, genotypic correlations were higher than phenotypic correlations; this may be due to the relative stability of genotypes as the majority of them were subjected to a certain amount of selection 14,28,30 , and similar results were obtained by 11,15,16,31,49 .…”

Section: Discussionmentioning

confidence: 68%

Evaluation of genetic gains of some quantitative characters in Egyptian cotton cross (Giza 86 × Menoufi) under water deficit stress

El-Aty

Kamara

El-Moghazy

et al. 2022

Sci Rep

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This work was carried out to select cotton genotypes adapted to semi-arid climate conditions cultivated under irrigation for high yields and the standards of the fiber quality properties required by the textile industry. Also to determine the predicted and realized gains from different selection indices to improve some economic characters under water stress conditions. Except for lint percentage and Pressley index, F4 generation reduced PCV and GCV values for all studied characters due to reduction in genetic variability and heterozygosity due to different selection procedures that exhausted a significant part of variability. Except for fiber length and micronaire reading, mean performance in the F4 generation was revealed to be higher than those in the F3 generation for all studied characters. However, micronaire reading was lower (desirable) in F4 than F3 generation. Generally, genotypic correlations were higher than phenotypic correlations. Direct selection for lint index (Ped.3) was the most efficient in improving lint cotton yield/plant and bolls/plant. However, the multiplicative index involving all studied characters (I.5) exhibited the highest values for boll weight. Also, the Ped.2 index (direct selection for lint percentage) proved to be the most efficient in improving seed and lint indexes. Direct selection for lint cotton yield/plant (Ped.1) could produce the highest desirable values for lint percentage and seed per boll with a relatively reasonable yield. A selection index involving yield and its components (I.3) is recommended in improving uniformity index, fiber strength, and micronaire reading. The superior five families released from these indices in F4 generation exceeded the better parent for lint cotton yield/plant, bolls/plant, boll weight, seeds/boll, lint index, and reasonable fiber traits. These families could be continued to further generations as breeding material for developing water deficit tolerant genotypes.

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“…These families could be continued to further generations as breeding genotypes for developing higher yield and its components. Nazmey et al 58 studied cotton yield and yield components in relation to the relative contribution and found that seed cotton yield was significantly and positively correlated with boll weight and lint yield. The same relationship was found between lint yield and each boll weight and seed cotton yield 59 – 61 .Which reported that positive significant correlation values were found between seed cotton and lint yields with boll weight and lint percentage.…”

Section: Discussionmentioning

confidence: 99%

Genetic improvement of Egyptian cotton (Gossypium barbadense L.) for high yield and fiber quality properties under semi arid conditions

Lamlom,

Yehia,

Kotb

et al. 2024

Sci Rep

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Between 2016 and 2018, the Agriculture Research Center's Sakha Agriculture Research Station conducted two rounds of pedigree selection on a segregating population of cotton (Gossypium barbadense L.) using the F2, F3, and F4 generations resulting from crossing Giza 94 and Suvin. In 2016, the top 5% of plants from the F2 population were selected based on specific criteria. The superior families from the F3 generation were then selected to produce the F4 families in 2017, which were grown in the 2018 summer season in single plant progeny rows and bulk experiments with a randomized complete block design of three replications. Over time, most traits showed increased mean values in the population, with the F2 generation having higher Genotypic Coefficient of Variance (GCV) and Phenotypic Coefficient of Variance (PCV) values compared to the succeeding generations for the studied traits. The magnitude of GCV and PCV in the F3 and F4 generations was similar, indicating that genotype had played a greater role than the environment. Moreover, the mean values of heritability in the broad sense increased from generation to generation. Selection criteria I2, I4, and I5 were effective in improving most of the yield and its component traits, while selection criterion I1 was efficient in improving earliness traits. Most of the yield and its component traits showed a positive and significant correlation with each other, highlighting their importance in cotton yield. This suggests that selecting to improveone or more of these traits would improve the others. Families number 9, 13, 19, 20, and 21 were the best genotypes for relevant yield characters, surpassing the better parent, check variety, and giving the best values for most characters. Therefore, the breeder could continue to use these families in further generations as breeding genotypes to develop varieties with high yields and its components.

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GENETICAL ANALYSIS FOR F1 AND F2 GENERATION IN SOME EGYPTIAN COTTON CROSSES (Gossypium barbadense L.)

Cited by 3 publications

References 1 publication

Sensitivity of Cotton <em>Gossypium barbadense</em> L. to Various Selection Criteria for Yield, Yield Components, and Earliness Attributes

Sensitivity of Cotton <em>Gossypium barbadense</em> L. to Various Selection Criteria for Yield, Yield Components, and Earliness Attributes

Evaluation of genetic gains of some quantitative characters in Egyptian cotton cross (Giza 86 × Menoufi) under water deficit stress

Genetic improvement of Egyptian cotton (Gossypium barbadense L.) for high yield and fiber quality properties under semi arid conditions

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