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Genetic Variation for Seed Metabolite Levels in Brachypodium distachyon

1
Bioproductivity Informatics Research Team, RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
2
Kihara Institute for Biological Research, Yokohama City University, 641-12 Maioka-cho, Totsuka-ku, Yokohama, Kanagawa 244-0813, Japan
3
Metabolic Systems Research Team, RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
4
Graduate School of Nanobioscience, Yokohama City University, 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
5
Plant Science Research Unit, United States Department of Agriculture, Agricultural Research Service, 1991 Upper Buford Circle, St. Paul, MN 55108, USA
6
Institute of Plant Science and Resource, Okayama University, 2-20-1 Chuo, Kurashiki, Okayama 710-0046, Japan
7
Microalgae Production Control Technology Laboratory, RIKEN Baton Zone Program, RIKEN Cluster for Science, Technology and Innovation Hub, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Int. J. Mol. Sci. 2019, 20(9), 2348; https://doi.org/10.3390/ijms20092348
Received: 27 March 2019 / Revised: 26 April 2019 / Accepted: 27 April 2019 / Published: 11 May 2019
(This article belongs to the Collection Feature Papers in Molecular Plant Sciences)
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Abstract

Metabolite composition and concentrations in seed grains are important traits of cereals. To identify the variation in the seed metabolotypes of a model grass, namely Brachypodium distachyon, we applied a widely targeted metabolome analysis to forty inbred lines of B. distachyon and examined the accumulation patterns of 183 compounds in the seeds. By comparing the metabolotypes with the population structure of these lines, we found signature metabolites that represent different accumulation patterns for each of the three B. distachyon subpopulations. Moreover, we found that thirty-seven metabolites exhibited significant differences in their accumulation between the lines Bd21 and Bd3-1. Using a recombinant inbred line (RIL) population from a cross between Bd3-1 and Bd21, we identified the quantitative trait loci (QTLs) linked with this variation in the accumulation of thirteen metabolites. Our metabolite QTL analysis illustrated that different genetic factors may presumably regulate the accumulation of 4-pyridoxate and pyridoxamine in vitamin B6 metabolism. Moreover, we found two QTLs on chromosomes 1 and 4 that affect the accumulation of an anthocyanin, chrysanthemin. These QTLs genetically interacted to regulate the accumulation of this compound. This study demonstrates the potential for metabolite QTL mapping in B. distachyon and provides new insights into the genetic dissection of metabolomic traits in temperate grasses. View Full-Text
Keywords: Brachypodium distachyon; metabolome; QTL analysis; recombinant inbred line; vitamin B6; chrysanthemin Brachypodium distachyon; metabolome; QTL analysis; recombinant inbred line; vitamin B6; chrysanthemin
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Onda, Y.; Inoue, K.; Sawada, Y.; Shimizu, M.; Takahagi, K.; Uehara-Yamaguchi, Y.; Hirai, M.Y.; Garvin, D.F.; Mochida, K. Genetic Variation for Seed Metabolite Levels in Brachypodium distachyon. Int. J. Mol. Sci. 2019, 20, 2348.

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