Universität zu Köln

Stetter, Markus G. ORCID: 0000-0001-7136-0589, Vidal-Villarejo, Mireia and Schmid, Karl J. (2020). Parallel Seed Color Adaptation during Multiple Domestication Attempts of an Ancient New World Grain. Mol. Biol. Evol., 37 (5). S. 1407 - 1420. OXFORD: OXFORD UNIV PRESS. ISSN 1537-1719

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Abstract

Thousands of plants have been selected as crops; yet, only a few are fully domesticated. The lack of adaptation to agroecological environments of many crop plants with few characteristic domestication traits potentially has genetic causes. Here, we investigate the incomplete domestication of an ancient grain from the Americas, amaranth. Although three grain amaranth species have been cultivated as crop for millennia, all three lack key domestication traits. We sequenced 121 crop and wild individuals to investigate the genomic signature of repeated incomplete adaptation. Our analysis shows that grain amaranth has been domesticated three times from a single wild ancestor. One trait that has been selected during domestication in all three grain species is the seed color, which changed from dark seeds to white seeds. We were able to map the genetic control of the seed color adaptation to two genomic regions on chromosomes 3 and 9, employing three independent mapping populations. Within the locus on chromosome 9, we identify an MYB-like transcription factor gene, a known regulator for seed color variation in other plant species. We identify a soft selective sweep in this genomic region in one of the crop species but not in the other two species. The demographic analysis of wild and domesticated amaranths revealed a population bottleneck predating the domestication of grain amaranth. Our results indicate that a reduced level of ancestral genetic variation did not prevent the selection of traits with a simple genetic architecture but may have limited the adaptation of complex domestication traits.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Stetter, Markus G. UNSPECIFIED orcid.org/0000-0001-7136-0589 UNSPECIFIED Vidal-Villarejo, Mireia UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmid, Karl J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-335051
DOI:	10.1093/molbev/msz304
Journal or Publication Title:	Mol. Biol. Evol.
Volume:	37
Number:	5
Page Range:	S. 1407 - 1420
Date:	2020
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1537-1719
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Biology > Botanical Institute
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MAIZE DOMESTICATION; CROP DOMESTICATION; SELECTIVE SWEEPS; GENETIC-ANALYSIS; GENOME; RICE; EVOLUTION; WILD; POLYMORPHISMS; ASSOCIATION Multiple languages Biochemistry & Molecular Biology; Evolutionary Biology; Genetics & Heredity Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/33505