title: Heterologous expression of a rice miR395 gene in Nicotiana tabacum impairs sulfate homeostasis.
abstract: Sulfur participates in many important mechanisms and pathways of plant development. The most common source of sulfur in soil -SO4(2-)- is absorbed into root tissue and distributed into aerial part through vasculature system, where it is reduced into sulfite and finally sulfide within the subcellular organs such as chloroplasts and mitochondria and used for cysteine and methionine biosynthesis. MicroRNAs are involved in many regulation pathways by repressing the expression of their target genes. MiR395 family in Arabidopsis thaliana has been reported to be an important regulator involved in sulfate transport and assimilation, and a high-affinity sulphate transporter and three ATP sulfurylases (ATPS) were the target genes of AthmiR395 (Arabidopsis thaliana miR395). We have cloned a miR395 gene from rice (Oryza sativa) and studied its function in plant nutritional response. Our results indicated that in rice, transcript level of OsamiR395 (Oryza sativa miR395) increased under sulfate deficiency conditions, and the two predicted target genes of miR395 were down-regulated under the same conditions. Overexpression of OsamiR395h in tobacco impaired its sulfate homeostasis, and sulfate distribution was also slightly impacted among leaves of different ages. One sulfate transporter (SULTR) gene NtaSULTR2 was identified to be the target of miR395 in Nicotiana tobacum, which belongs to low affinity sulfate transporter group. Both miR395 and NtaSULTR2 respond to sulfate starvation in tobacco.
authors.affiliation: Department of Genetics and Biochemistry, Clemson University, 105 Collings street, 110 Biosystems Research Complex, Clemson, South Carolina, 29634-0318, USA.
authors.forename: Ning
authors.initials: N
authors.lastname: Yuan
authors.affiliation: Department of Genetics and Biochemistry, Clemson University, 105 Collings street, 110 Biosystems Research Complex, Clemson, South Carolina, 29634-0318, USA.
authors.forename: Shuangrong
authors.initials: S
authors.lastname: Yuan
authors.affiliation: Department of Genetics and Biochemistry, Clemson University, 105 Collings street, 110 Biosystems Research Complex, Clemson, South Carolina, 29634-0318, USA.
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Li
authors.affiliation: Department of Genetics and Biochemistry, Clemson University, 105 Collings street, 110 Biosystems Research Complex, Clemson, South Carolina, 29634-0318, USA.
authors.forename: Dayong
authors.initials: D
authors.lastname: Li
authors.affiliation: Department of Genetics and Biochemistry, Clemson University, 105 Collings street, 110 Biosystems Research Complex, Clemson, South Carolina, 29634-0318, USA.
authors.forename: Qian
authors.initials: Q
authors.lastname: Hu
authors.affiliation: Department of Genetics and Biochemistry, Clemson University, 105 Collings street, 110 Biosystems Research Complex, Clemson, South Carolina, 29634-0318, USA.
authors.forename: Hong
authors.initials: H
authors.lastname: Luo
mesh_terms: D027321:Anion Transport Proteins / Q000235:genetics / Q000378:metabolism; D001483:Base Sequence; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant / Q000235:genetics; D006706:Homeostasis; D035683:MicroRNAs / Q000235:genetics*; D012275:Oryza / Q000235:genetics*; D018515:Plant Leaves / Q000235:genetics / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D030821:Plants, Genetically Modified; D018749:RNA, Plant / Q000235:genetics*; D012689:Sequence Homology, Nucleic Acid; D013431:Sulfates / Q000378:metabolism*; D014026:Nicotiana / Q000235:genetics* / Q000378:metabolism
chemical_list: D027321:Anion Transport Proteins; D035683:MicroRNAs; D010940:Plant Proteins; D018749:RNA, Plant; D013431:Sulfates