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Title: Comparative genomics and transcriptomics analysis reveals evolution patterns of selection in the Salix phylogeny

Journal Article · · BMC Genomics
 [1];  [2];  [2];  [2];  [2];  [2]
  1. Southwest Forestry Univ., Yunnan (China). Key Lab. of Forestry and Ecological Big Data State Forestry Administration; Southwest Forestry Univ., Yunnan (China). College of Big data and Intelligent Engineering; Southwest Forestry Univ., Yunnan (China). Ministry of Education. Key Lab. for Forest Resources Conservation and Utilization in the Southwest Mountains of China
  2. Southwest Forestry Univ., Yunnan (China). College of Big data and Intelligent Engineering

Background: Willows are widely distributed in the northern hemisphere and have good adaptability to different living environment. The increasing of genome and transcriptome data provides a chance for comparative analysis to study the evolution patterns with the different origin and geographical distributions in the Salix phylogeny. Results: Transcript sequences of 10 Salicaceae species were downloaded from public databases. All pairwise of orthologues were identified by comparative analysis in these species, from which we constructed a phylogenetic tree and estimated the rate of diverse. Divergence times were estimated in the 10 Salicaceae using comparative transcriptomic analysis. All of the fast-evolving positive selection sequences were identified, and some cold-, drought-, light-, universal-, and heat- resistance genes were discovered. Conclusions: The divergence time of subgenus Vetrix and Salix was about 17.6–16.0 Mya during the period of Middle Miocene Climate Transition (21–14 Mya). Subgenus Vetrix diverged to migratory and resident groups when the climate changed to the cool and dry trend by 14 Mya. Cold- and light- stress genes were involved in positive selection among the resident Vetrix, and which would help them to adapt the cooling stage. Universal- stress genes exhibited positive selection among the migratory group and subgenus Salix. These data are useful for comprehending the adaptive evolution and speciation in the Salix lineage.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1626821
Journal Information:
BMC Genomics, Vol. 20, Issue 1; ISSN 1471-2164
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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