Assessment of Gene Flow Between Gossypium hirsutum and G. herbaceum: Evidence of Unreduced Gametes in the Diploid Progenitor

Montes, Émilie; Coriton, Olivier; Eber, Frédérique; Huteau, Virginie; Lacape, Jean-Marc; Reinhardt, C. F.; Marais, D.; Hofs, Jean-Luc; Chèvre, Anne‐Marie; Pannetier, Catherine

doi:10.1534/g3.117.041509

Cited by 5 publications

(7 citation statements)

References 48 publications

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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%

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Sensitivity of Cotton Gossypium barbadense 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%

“…[1]. Cotton belongs to the genus Gossypium L. (Malvaceae), containing 52 species; 45 are diploid 2n =2x= 26 chromosomes, and seven are allotetraploid: 2n =4x= 52 chromosomes [2]. Only four species are the most widely cultivated.…”

Section: Introductionmentioning

confidence: 99%

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

Aty¹,

Sorour²,

Kotb³

et al. 2022

Preprint

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“…These families could be continued to further generations as breeding material for developing water deficit tolerant genotypes. Similar findings were reported by 11,12,15,31 . 32 was performed using the MASS package in R software version 4.1.0 33 .…”

supporting

confidence: 91%

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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“…The formation of unreduced gametes is prevalent in diverse plant species, including in Gossypium in which it was recently found to occur (Montes et al, 2017). …”

Section: Discussionmentioning

confidence: 99%

Revisiting Meiosis in Sugarcane: Chromosomal Irregularities and the Prevalence of Bivalent Configurations

et al. 2018

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Traditional sugarcane cultivars (Saccharum officinarum) proved highly susceptible to diseases, and this led breeders to progress to interspecific crosses resulting in disease resistance. A backcrossing program to S. officinarum was then required to boost sucrose content. Clonal selection across generations and incorporation of other germplasm into cultivated backgrounds established the (narrow) genetic base of modern cultivars (Saccharum spp.), which have a man-made genome. The genome complexity has inspired several molecular studies that have elucidated aspects of sugarcane genome constitution, architecture, and cytogenetics. However, there is a critical shortage of information on chromosome behavior throughout meiosis in modern cultivars. In this study, we examined the microsporogenesis of a contemporary variety, providing a detailed analysis of the meiotic process and chromosome association at diakinesis, using FISH with centromeric probes. Chromosomal abnormalities were documented by examining high quality preparations of pollen mother cells (700 in total). Approximately 70% of the cells showed abnormalities, such as metaphase chromosomes not lined up at the plate, lagging chromosomes and chromosomal bridges, and tetrad cells with micronuclei. Some dyads with asynchronous behavior were also observed. Due to the hybrid composition of the sugarcane genome, we suggest that bivalent incomplete pairing may occur in the first prophase leading to univalency. The presence of rod bivalents showing the lagging tendency is consistent with a reduction in chiasma frequency. Finally, the presence of chromatin bridges indicates the indirect occurrence of chromosomal inversions, although chromosome fragments were not clearly recognized. Possible reasons for such meiotic abnormalities and the large prevalence of bivalent formation are discussed.

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Assessment of Gene Flow Between Gossypium hirsutum and G. herbaceum: Evidence of Unreduced Gametes in the Diploid Progenitor

Cited by 5 publications

References 48 publications

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

Revisiting Meiosis in Sugarcane: Chromosomal Irregularities and the Prevalence of Bivalent Configurations

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