Data from: Genome sequencing and analysis of the peanut b-genome progenitor (Arachis ipaensis)

Peanut (Arachis hypogaea L.), an important leguminous crop, is widely
cultivated in tropical and subtropical regions. Peanut is an
allotetraploid, having A and B subgenomes that maybe have originated in
its diploid progenitors Arachis duranensis (A-genome) and Arachis ipaensis
(B-genome), respectively. We previously sequenced the former and here
present the draft genome of the latter, expanding our knowledge of the
unique biology of Arachis. The assembled genome of A. ipaensis is ~1.39 Gb
with 39,704 predicted protein-encoding genes. A gene family analysis
revealed that the FAR1 family may be involved in regulating peanut special
fruit development. Genomic evolutionary analyses estimated that the two
progenitors diverged ~3.3 million years ago and suggested that A. ipaensis
experienced a whole-genome duplication event after the divergence of
Glycine max. We identified a set of disease resistance-related genes and
candidate genes for biological nitrogen fixation. In particular, two and
four homologous genes that may be involved in the regulation of nodule
development were obtained from A.ipaensis and A.duranensis, respectively.
We outline a comprehensive network involved in drought adaptation.
Additionally, we analyzed the metabolic pathways involved in oil
biosynthesis and found genes related to fatty acid and triacylglycerol
synthesis. Importantly, three new FAD2 homologous genes were identified
from A. ipaensis and one was completely homologous at the amino acid level
with FAD2 from A.hypogaea. The availability of the A. ipaensis and A.
duranensis genomic assemblies will advance our knowledge of the peanut
genome.