title: Sequence and expression analysis of the thioredoxin protein gene family in rice.
abstract: Thioredoxin (Trx) proteins play important biological functions in cells by changing redox via thioldisulfide exchange. This system is especially widespread in plants. Through database search, we identified 30 potential Trx protein-encoding genes (OsTrx) in rice (Oryza sativa L.). An analysis of the complete set of OsTrx proteins is presented here, including chromosomal location, conserved motifs, domain duplication, and phylogenetic relationships. Our findings suggest that the expansion of the Trx gene family in rice, in large part, occurred due to gene duplication. A comprehensive expression profile of Trx genes family was investigated by analyzing the signal data of this family extracted from the whole genome microarray analysis of Minghui 63 and Zhenshan 97, two indica parents, and their hybrid Shanyou 63, using 27 different tissues representing the entire life cycle of rice. Results revealed specific expression of some members at germination transition as well as the 3-leaf stage during the vegetative growth phase of rice. OsTrx genes were also found to be differentially up- or down-regulated in rice seedlings subjected to treatments of phytohormones and light/dark conditions. The expression levels of the OsTrx genes in the different tissues and under different treatments were also checked by RT-PCR analysis. The identification of OsTrx genes showing differential expression in specific tissues among different genotypes or in response to different environmental cues could provide a new avenue for functional analyses in rice.
authors.affiliation: National Key Laboratory of Crop Genetic Improvement, National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, China.
authors.forename: Mohammed
authors.initials: M
authors.lastname: Nuruzzaman
authors.forename: Madhur
authors.initials: M
authors.lastname: Gupta
authors.forename: Chengjun
authors.initials: C
authors.lastname: Zhang
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Weibo
authors.initials: W
authors.lastname: Xie
authors.forename: Lizhong
authors.initials: L
authors.lastname: Xiong
authors.forename: Qifa
authors.initials: Q
authors.lastname: Zhang
authors.forename: Xingming
authors.initials: X
authors.lastname: Lian
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D001483:Base Sequence; D002874:Chromosome Mapping; D018744:DNA, Plant / Q000235:genetics; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D008969:Molecular Sequence Data; D005810:Multigene Family; D020411:Oligonucleotide Array Sequence Analysis; D012275:Oryza / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D013879:Thioredoxins / Q000235:genetics* / Q000378:metabolism; D014018:Tissue Distribution
chemical_list: D018744:DNA, Plant; D010940:Plant Proteins; D013879:Thioredoxins