Introgression from Gossypium hirsutum is a driver for population divergence and genetic diversity in Gossypium barbadense

Abstract

During the domestication and improvement processes, interspecific introgression from Gossypium hirsutum has reorganized the genomic architecture of Gossypium barbadense; however, the introgression details and the trait-related genetic loci remain largely unknown. Here, we perform a genome-wide population analysis and genetically recategorize 365 G. barbadense accessions into four subgroups which is different from previous categorizations. A total of 315 introgression events from G. hirsutum to G. barbadense, which primarily contributed to population divergence and agronomic trait variation in G. barbadense, are identified. We find that 70% introgression from G. hirsutum have greatly increased the genetic diversity and divergence of G. barbadense. Some loci are identified with divergent haplotype selection for adaptation to the environment at high latitudes. Through genome-wide association study and genome linkage disequilibrium interval haplotyping analyses, two fiber micronaire-related haplotype blocks are detected, one of which (FM2) is introgressed from G. hirsutum. Seven distinguished traits related to growth period, plant architecture, and stronger vegetative growth habit are found to have pleiotropic effects controlled by a single gene in G. barbadense. Thus, this study provides new insights into the breeding history of G. barbadense and highlights introgression is a driver for improving cultivars in G. barbadense.

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

“…Also, the results indicated that mean performance for most selected families differed; these results could be due to gene expression for these families; therefore, selection for adaptable families and higher than means for better parent and commercial variety well be a help to produce high yielding recombination and earlier to grow it often winter cropping without a decrease in yield. These results are in harmony with those previously reported [33,[46][47][48][49][50]. It appeared that most of the yield and its component traits were positive and either significant or highly significant correlated with each other, indicating that these traits are essential components of cotton yield.…”

“…These results indicated using the lint index selection to improve boll weight and seed cotton yield. Similar results were previously reported [33,36,[44][45][46] The differences between generations may be due to the various genotypes scored by each selection criteria. The analysis of variance showed highly significant differences among families of F4 for all the studied characters meaning that selection criteria would be effective.…”

Differential seedling growth and tolerance indices reflect drought tolerance in cotton

“…A panel of 18 cotton genotypes, genetically diverse, was selected from the previously Characterized, genotyped, and screened germplasm (genotypes) of three cotton species (Spp. ), including; 420 Gossypium hirsutum ( Gh ) genotypes [ 40 ], 360 Gossypium barbadense ( Gb ) genotypes [ 41 ], and 215 Gossypium arboreum ( Ga ) genotypes [ 42 ] (genotype IDs are mentioned in Supplementary Table S 1 ). Six genotypes from each Spp., including three drought-tolerant and three drought susceptible genotypes, were selected based on drought tolerance indices (unpublished data).…”

Genome-wide association analysis reveals a novel pathway mediated by a dual-TIR domain protein for pathogen resistance in cotton

“…Given that the introgression-of-interest in our study located on chromosome A10 of the At subgenome, we made the assumption that G. thurberi was exceedingly unlikely to be the donor for A10 introgressions, thus narrowing the field of donors to G. arboreum and G. barbadense . Following a recent reported method for identification introgression [ 26 , 31 ], we separately analyzed the introgressed fragments from G. arboreum and from G. barbadense . Fortunately, this analysis indicated that SHZDI1 shared overlap with a fragment from G. aboreum and shared no overlap with G. barbadense (Additional file 2 : Table S8), findings supporting that the introgressions are from G. arboreum.…”

“…The exotic introgression analysis followed a previously described procedure [ 26 , 31 ]. The two potential donors for introgressed fragments, G. barbadense and G. arboreum , were evaluated in the introgression analysis.…”