Dataset Information

Mapping QTL for Root and Shoot Morphological Traits in a Durum Wheat?×?T. dicoccum Segregating Population at Seedling Stage.

ABSTRACT: A segregating population of 136 recombinant inbred lines derived from a cross between the durum wheat cv. "Simeto" and the T. dicoccum accession "Molise Colli" was grown in soil and evaluated for a number of shoot and root morphological traits. A total of 17 quantitative trait loci (QTL) were identified for shoot dry weight, number of culms, and plant height and for root dry weight, volume, length, surface area, and number of forks and tips, on chromosomes 1B, 2A, 3A, 4B, 5B, 6A, 6B, and 7B. LODs were 2.1 to 21.6, with percent of explained phenotypic variability between 0.07 and 52. Three QTL were mapped to chromosome 4B, one of which corresponds to the Rht-B1 locus and has a large impact on both shoot and root traits (LOD 21.6). Other QTL that have specific effects on root morphological traits were also identified. Moreover, meta-QTL analysis was performed to compare the QTL identified in the "Simeto"?×?"Molise Colli" segregating population with those described in previous studies in wheat, with three novel QTL defined. Due to the complexity of phenotyping for root traits, further studies will be helpful to validate these regions as targets for breeding programs for optimization of root function for field performance.

SUBMITTER: Iannucci A

PROVIDER: S-EPMC5563412 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature

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Mapping QTL for Root and Shoot Morphological Traits in a Durum Wheat × <i>T. dicoccum</i> Segregating Population at Seedling Stage.

Iannucci Anna A Marone Daniela D Russo Maria Anna MA De Vita Pasquale P Miullo Vito V Ferragonio Pina P Blanco Antonio A Gadaleta Agata A Mastrangelo Anna Maria AM

International journal of genomics 20170806

A segregating population of 136 recombinant inbred lines derived from a cross between the durum wheat cv. "Simeto" and the <i>T. dicoccum</i> accession "Molise Colli" was grown in soil and evaluated for a number of shoot and root morphological traits. A total of 17 quantitative trait loci (QTL) were identified for shoot dry weight, number of culms, and plant height and for root dry weight, volume, length, surface area, and number of forks and tips, on chromosomes 1B, 2A, 3A, 4B, 5B, 6A, 6B, and ...[more]

PMID: 28845431

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Project description:Background and aimsPlant roots growing underground are critical for soil resource acquisition, anchorage and plant-environment interactions. In wheat ( Triticum aestivum ), however, the target root traits to improve yield potential still remain largely unknown. This study aimed to identify traits of seedling root system architecture (RSA) associated with yield and yield components in 226 recombinant inbred lines (RILs) derived from a cross between the bread wheat Triticum aestivum 'Forno' (small, wide root system) and spelt Triticum spelta 'Oberkulmer' (large, narrow root system).MethodsA 'pouch and wick' high-throughput phenotyping pipeline was used to determine the RSA traits of 13-day-old RIL seedlings. Two field experiments and one glasshouse experiment were carried out to investigate the yield, yield components and phenology, followed by identification of quantitative trait loci (QTLs).Key resultsThere was substantial variation in RSA traits between genotypes. Seminal root number and total root length were both positively associated with grains m -2 , grains per spike, above-ground biomass m -2 and grain yield. More seminal roots and longer total root length were also associated with delayed maturity and extended grain filling, likely to be a consequence of more grains being defined before anthesis. Additionally, the maximum width of the root system displayed positive relationships with spikes m -2 , grains m -2 and grain yield. Ten RILs selected for the longest total roots exhibited the same effects on yield and phenology as described above, compared with the ten lines with the shortest total roots. Genetic analysis revealed 38 QTLs for the RSA, and QTL coincidence between the root and yield traits was frequently observed, indicating tightly linked genes or pleiotropy, which concurs with the results of phenotypic correlation analysis.ConclusionsBased on the results from the Forno × Oberkulmer population, it is proposed that vigorous early root growth, particularly more seminal roots and longer total root length, is important to improve yield potential, and should be incorporated into wheat ideotypes in breeding.

Dataset Information

Mapping QTL for Root and Shoot Morphological Traits in a Durum Wheat?×?T. dicoccum Segregating Population at Seedling Stage.

Publications

Mapping QTL for Root and Shoot Morphological Traits in a Durum Wheat × <i>T. dicoccum</i> Segregating Population at Seedling Stage.

Similar Datasets

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