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The genome of a wild Medicago species provides insights into the tolerant mechanisms of legume forage to environmental stress
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The genome of a wild Medicago species provides insights into the tolerant mechanisms of legume forage to environmental stress
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Journal Article
The genome of a wild Medicago species provides insights into the tolerant mechanisms of legume forage to environmental stress
2021
Overview
Background
Medicago ruthenica
, a wild and perennial legume forage widely distributed in semi-arid grasslands, is distinguished by its outstanding tolerance to environmental stress. It is a close relative of commonly cultivated forage of alfalfa (
Medicago sativa
). The high tolerance of
M. ruthenica
to environmental stress makes this species a valuable genetic resource for understanding and improving traits associated with tolerance to harsh environments.
Results
We sequenced and assembled genome of
M. ruthenica
using an integrated approach, including PacBio, Illumina, 10×Genomics, and Hi-C. The assembled genome was 904.13 Mb with scaffold N50 of 99.39 Mb, and 50,162 protein-coding genes were annotated. Comparative genomics and transcriptomic analyses were used to elucidate mechanisms underlying its tolerance to environmental stress. The expanded
FHY3/FAR1
family was identified to be involved in tolerance of
M. ruthenica
to drought stress. Many genes involved in tolerance to abiotic stress were retained in
M. ruthenica
compared to other cultivated
Medicago
species. Hundreds of candidate genes associated with drought tolerance were identified by analyzing variations in single nucleotide polymorphism using accessions of
M. ruthenica
with varying tolerance to drought. Transcriptomic data demonstrated the involvements of genes related to transcriptional regulation, stress response, and metabolic regulation in tolerance of
M. ruthenica.
Conclusions
We present a high-quality genome assembly and identification of drought-related genes in the wild species of
M. ruthenica
, providing a valuable resource for genomic studies on perennial legume forages.
Publisher
BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
Subject
