title: Retention and Molecular Evolution of Lipoxygenase Genes in Modern Rosid Plants.
abstract: Whole-genome duplication events have occurred more than once in the genomes of some rosids and played a significant role over evolutionary time. Lipoxygenases (LOXs) are involved in many developmental and resistance processes in plants. Our study concerns the subject of theLOXgene family; we tracked the evolutionary process of ancestralLOXgenes in four modern rosids. Here we show that some members of theLOXgene family in theArabidopsisgenome are likely to be lost during evolution, leading to a smaller size than that inPopulus, Vitis, andCarica. Strong purifying selection acted as a critical role in almost all of the paralogous and orthologous genes. The structure ofLOXgenes inCaricaandPopulusare relatively stable, whereasVitisandArabidopsishave a difference. By searching conserved motifs ofLOXgenes, we found that each sub-family shared similar components. Research on intraspecies gene collinearity show that recent duplication holds an important position inPopulusandArabidopsis. Gene collinearity analysis within and between these four rosid plants revealed that allLOXgenes in each modern rosid were the offspring from different ancestral genes. This study traces the evolution ofLOXgenes which have been differentially retained and expanded in rosid plants. Our results presented here may aid in the selection of special genes retained in the rosid plants for further analysis of biological function.
authors.affiliation: Laboratory of Modern Biotechnology, Anhui Agricultural University Hefei, China.
authors.forename: Zhu
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Laboratory of Modern Biotechnology, Anhui Agricultural University Hefei, China.
authors.forename: Danmei
authors.initials: D
authors.lastname: Chen
authors.affiliation: Laboratory of Modern Biotechnology, Anhui Agricultural University Hefei, China.
authors.forename: Wenyuan
authors.initials: W
authors.lastname: Chu
authors.affiliation: Laboratory of Modern Biotechnology, Anhui Agricultural University Hefei, China.
authors.forename: Dongyue
authors.initials: D
authors.lastname: Zhu
authors.affiliation: Laboratory of Modern Biotechnology, Anhui Agricultural UniversityHefei, China; Key Laboratory of Biomass Improvement and Conversion, Anhui Agriculture UniversityHefei, China.
authors.forename: Hanwei
authors.initials: H
authors.lastname: Yan
authors.affiliation: Laboratory of Modern Biotechnology, Anhui Agricultural UniversityHefei, China; Key Laboratory of Biomass Improvement and Conversion, Anhui Agriculture UniversityHefei, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Xiang
keywords: evolutionary history; gene duplication; lipoxygenase; purifying selection; syntenic chromosomal block