title: Genome-Wide Characterization and Expression Analysis of Major Intrinsic Proteins during Abiotic and Biotic Stresses in Sweet Orange (Citrus sinensis L. Osb.).
abstract: The family of aquaporins (AQPs), or major intrinsic proteins (MIPs), includes integral membrane proteins that function as transmembrane channels for water and other small molecules of physiological significance. MIPs are classified into five subfamilies in higher plants, including plasma membrane (PIPs), tonoplast (TIPs), NOD26-like (NIPs), small basic (SIPs) and unclassified X (XIPs) intrinsic proteins. This study reports a genome-wide survey of MIP encoding genes in sweet orange (Citrus sinensis L. Osb.), the most widely cultivated Citrus spp. A total of 34 different genes encoding C. sinensis MIPs (CsMIPs) were identified and assigned into five subfamilies (CsPIPs, CsTIPs, CsNIPs, CsSIPs and CsXIPs) based on sequence analysis and also on their phylogenetic relationships with clearly classified MIPs of Arabidopsis thaliana. Analysis of key amino acid residues allowed the assessment of the substrate specificity of each CsMIP. Gene structure analysis revealed that the CsMIPs possess an exon-intron organization that is highly conserved within each subfamily. CsMIP loci were precisely mapped on every sweet orange chromosome, indicating a wide distribution of the gene family in the sweet orange genome. Investigation of their expression patterns in different tissues and upon drought and salt stress treatments, as well as with 'Candidatus Liberibacter asiaticus' infection, revealed a tissue-specific and coordinated regulation of the different CsMIP isoforms, consistent with the organization of the stress-responsive cis-acting regulatory elements observed in their promoter regions. A special role in regulating the flow of water and nutrients is proposed for CsTIPs and CsXIPs during drought stress, and for most CsMIPs during salt stress and the development of HLB disease. These results provide a valuable reference for further exploration of the CsMIPs functions and applications to the genetic improvement of both abiotic and biotic stress tolerance in citrus.
authors.affiliation: Center for Biotechnology and Genetics, Biological Sciences Department, State University of Santa Cruz, Ilhéus, Bahia, Brazil; Citrus Research and Education Center, Department of Horticultural Sciences, University of Florida, Lake Alfred, Florida, United States of America.
authors.forename: Cristina de Paula Santos
authors.initials: Cde P
authors.lastname: Martins
authors.affiliation: Center for Biotechnology and Genetics, Biological Sciences Department, State University of Santa Cruz, Ilhéus, Bahia, Brazil.
authors.forename: Andresa Muniz
authors.initials: AM
authors.lastname: Pedrosa
authors.affiliation: Citrus Research and Education Center, Department of Horticultural Sciences, University of Florida, Lake Alfred, Florida, United States of America.
authors.forename: Dongliang
authors.initials: D
authors.lastname: Du
authors.affiliation: Center for Biotechnology and Genetics, Biological Sciences Department, State University of Santa Cruz, Ilhéus, Bahia, Brazil.
authors.forename: Luana Pereira
authors.initials: LP
authors.lastname: Gonçalves
authors.affiliation: Citrus Research and Education Center, Department of Horticultural Sciences, University of Florida, Lake Alfred, Florida, United States of America.
authors.forename: Qibin
authors.initials: Q
authors.lastname: Yu
authors.affiliation: Citrus Research and Education Center, Department of Horticultural Sciences, University of Florida, Lake Alfred, Florida, United States of America.
authors.forename: Frederick G
authors.initials: FG
authors.lastname: Gmitter
authors.affiliation: Center for Biotechnology and Genetics, Biological Sciences Department, State University of Santa Cruz, Ilhéus, Bahia, Brazil.
authors.forename: Marcio Gilberto Cardoso
authors.initials: MG
authors.lastname: Costa
mesh_terms: D020346:Aquaporins / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism; D032461:Chromosomes, Plant; D032084:Citrus sinensis / Q000235:genetics* / Q000378:metabolism; D055864:Droughts; D056426:Genetic Loci; D018745:Genome, Plant; D010802:Phylogeny; D010940:Plant Proteins / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D013312:Stress, Physiological
chemical_list: D020346:Aquaporins; D010940:Plant Proteins