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Relics of interspecific hybridization retained in the genome of a drought-adapted peanut cultivar

Journal Article · · G3
 [1];  [2];  [1];  [1];  [1];  [2];  [3];  [3];  [3];  [4];  [4];  [1];  [5];  [6];  [5];  [1];  [7];  [3];  [7]
  1. HudsonAlpha Institute for Biotechnology, Huntsville, AL (United States)
  2. National Peanut Research Laboratory, USDA-ARS, Dawson, GA (United States)
  3. Auburn University College of Agriculture, AL (United States)
  4. University of Arizona, Tucson, AZ (United States)
  5. University of Georgia, Tifton, GA (United States)
  6. Crop Genetics and Breeding Research Unit, USDA-ARS, Tifton, GA (United States)
  7. HudsonAlpha Institute for Biotechnology, Huntsville, AL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Peanut (Arachis hypogaea L.) is a globally important oil and food crop frequently grown in arid, semi-arid, or dryland environments. Improving drought tolerance is a key goal for peanut crop improvement efforts. Here, we present the genome assembly and gene model annotation for “Line8,” a peanut genotype bred from drought-tolerant cultivars. Our assembly and annotation are the most contiguous and complete peanut genome resources currently available. The high contiguity of the Line8 assembly allowed us to explore structural variation both between peanut genotypes and subgenomes. We detect several large inversions between Line8 and other peanut genome assemblies, and there is a trend for the inversions between more genetically diverged genotypes to have higher gene content. We also relate patterns of subgenome exchange to structural variation between Line8 homeologous chromosomes. Unexpectedly, we discover that Line8 harbors an introgression from A.cardenasii, a diploid peanut relative and important donor of disease resistance alleles to peanut breeding populations. The fully resolved sequences of both haplotypes in this introgression provide the first in situ characterization of A.cardenasii candidate alleles that can be leveraged for future targeted improvement efforts. The completeness of our genome will support peanut biotechnology and broader research into the evolution of hybridization and polyploidy.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
NIFA (National Institute of Food and Agriculture); National Peanut Board; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2479207
Alternate ID(s):
OSTI ID: 2488369
Journal Information:
G3, Journal Name: G3 Journal Issue: 11 Vol. 14; ISSN 2160-1836
Publisher:
Genetics Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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