Optimise wheat A-genome

Optimise wheat A-genome research highlights CROP GENOMICS Nature 557, 424–428 (2018) Credit: Hong-qinq Ling, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences The wild einkorn wheat Triticum urartu (Tu) is the A-genome progenitor of tetraploid (AABB) and hexaploid (AABBDD) wheat. A draft genome of Tu was published in 2013, but a better reference sequence is urgently needed by scientists and breeders. Hong-Qing Ling, from the Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, and colleagues have now completed a high-quality Tu genome using multiple methods. Assisted by technologies like BAC-by- BAC sequencing, PacBio sequencing, linked- read sequencing and optical mapping, the researchers assembled a high-quality genome of Tu with contig and scaffold lengths significantly increased. The genome includes 41,507 predicted protein-coding genes. Repetitive elements cover 81% of the whole sequence, with bursts of retrotransposons that repeatedly expanded the genome. In comparison with other grass genomes, Tu-specific or wheat specifically amplified gene families were found to associate with stress response or vernalization. Large- scale retrotransposon-mediated structural rearrangements occurred during A-genome evolution, as revealed by comparing the A genomes among Tu, tetraploid and hexaploid wheat. An evolutionary model of the Tu chromosomes was proposed based on co-linearity analyses. Resequencing of the transcriptomes clustered 147 Tu accessions into three groups, with differences in altitudes of origin and resistance to powdery mildew pathogen. The optimised wheat A genome represents valuable resource for agricultural genetic research and breeding in wheat and related cereal crops. Jun Lyu Published online: 28 May 2018 https://doi.org/10.1038/s41477-018-0183-0 NAtuRE PlANt S | VOL 4 | JUNE 2018 | 320 | www.nature.com/natureplants © 2018 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. © 2018 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Plants Springer Journals

Optimise wheat A-genome

Nature Plants , Volume 4 (6) – May 28, 2018
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Publisher
Springer Journals
Copyright
Copyright © 2018 by The Author(s)
Subject
Life Sciences; Life Sciences, general; Plant Sciences
eISSN
2055-0278
D.O.I.
10.1038/s41477-018-0183-0
Publisher site
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Abstract

research highlights CROP GENOMICS Nature 557, 424–428 (2018) Credit: Hong-qinq Ling, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences The wild einkorn wheat Triticum urartu (Tu) is the A-genome progenitor of tetraploid (AABB) and hexaploid (AABBDD) wheat. A draft genome of Tu was published in 2013, but a better reference sequence is urgently needed by scientists and breeders. Hong-Qing Ling, from the Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, and colleagues have now completed a high-quality Tu genome using multiple methods. Assisted by technologies like BAC-by- BAC sequencing, PacBio sequencing, linked- read sequencing and optical mapping, the researchers assembled a high-quality genome of Tu with contig and scaffold lengths significantly increased. The genome includes 41,507 predicted protein-coding genes. Repetitive elements cover 81% of the whole sequence, with bursts of retrotransposons that repeatedly expanded the genome. In comparison with other grass genomes, Tu-specific or wheat specifically amplified gene families were found to associate with stress response or vernalization. Large- scale retrotransposon-mediated structural rearrangements occurred during A-genome evolution, as revealed by comparing the A genomes among Tu, tetraploid and hexaploid wheat. An evolutionary model of the Tu chromosomes was proposed based on co-linearity analyses. Resequencing of the transcriptomes clustered 147 Tu accessions into three groups, with differences in altitudes of origin and resistance to powdery mildew pathogen. The optimised wheat A genome represents valuable resource for agricultural genetic research and breeding in wheat and related cereal crops. Jun Lyu Published online: 28 May 2018 https://doi.org/10.1038/s41477-018-0183-0 NAtuRE PlANt S | VOL 4 | JUNE 2018 | 320 | www.nature.com/natureplants © 2018 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. © 2018 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.

Journal

Nature PlantsSpringer Journals

Published: May 28, 2018

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