title: RRP41L, a putative core subunit of the exosome, plays an important role in seed germination and early seedling growth in Arabidopsis.
abstract: In prokaryotic and eukaryotic cells, the 3'-5'-exonucleolytic decay and processing of RNAs are essential for RNA metabolism. However, the understanding of the mechanism of 3'-5'-exonucleolytic decay in plants is very limited. Here, we report the characterization of an Arabidopsis (Arabidopsis thaliana) transfer DNA insertional mutant that shows severe growth defects in early seedling growth, including delayed germination and cotyledon expansion, thinner yellow/pale-green leaves, and a slower growth rate. High-efficiency thermal asymmetric interlaced polymerase chain reaction analysis showed that the insertional locus was in the sixth exon of AT4G27490, encoding a predicted 3'-5'-exonuclease, that contained a conserved RNase phosphorolytic domain with high similarity to RRP41, designated RRP41L. Interestingly, we detected highly accumulated messenger RNAs (mRNAs) that encode seed storage protein and abscisic acid (ABA) biosynthesis and signaling pathway-related protein during the early growth stage in rrp41l mutants. The mRNA decay kinetics analysis for seed storage proteins, 9-cis-epoxycarotenoid dioxygenases, and ABA INSENSITIVEs revealed that RRP41L catalyzed the decay of these mRNAs in the cytoplasm. Consistent with these results, the rrp41l mutant was more sensitive to ABA in germination and root growth than wild-type plants, whereas overexpression lines of RRP41L were more resistant to ABA in germination and root growth than wild-type plants. RRP41L was localized to both the cytoplasm and nucleus, and RRP41L was preferentially expressed in seedlings. Altogether, our results showed that RRP41L plays an important role in seed germination and early seedling growth by mediating specific cytoplasmic mRNA decay in Arabidopsis.
authors.affiliation: State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
authors.forename: Min
authors.initials: M
authors.lastname: Yang
authors.forename: Bangyue
authors.initials: B
authors.lastname: Zhang
authors.forename: Jianheng
authors.initials: J
authors.lastname: Jia
authors.forename: Chunxia
authors.initials: C
authors.lastname: Yan
authors.forename: Ayijiang
authors.initials: A
authors.lastname: Habaike
authors.forename: Yuzhen
authors.initials: Y
authors.lastname: Han
mesh_terms: D000040:Abscisic Acid / Q000096:biosynthesis / Q000378:metabolism; D016960:Agrobacterium tumefaciens / Q000235:genetics / Q000378:metabolism; D017360:Arabidopsis / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development; D002467:Cell Nucleus / Q000201:enzymology / Q000235:genetics; D003001:Cloning, Molecular; D003593:Cytoplasm / Q000201:enzymology / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics / Q000378:metabolism; D049308:Dioxygenases / Q000235:genetics / Q000378:metabolism; D005092:Exonucleases / Q000235:genetics / Q000378:metabolism; D055354:Exosomes / Q000201:enzymology*; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D018525:Germination; D016254:Mutagenesis, Insertional; D010641:Phenotype; D018515:Plant Leaves / Q000201:enzymology / Q000235:genetics / Q000254:growth & development; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D018517:Plant Roots / Q000201:enzymology / Q000254:growth & development; D020871:RNA Stability; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D055314:Seed Storage Proteins / Q000235:genetics / Q000378:metabolism; D036226:Seedlings / Q000201:enzymology / Q000235:genetics / Q000254:growth & development*; D012639:Seeds / Q000201:enzymology / Q000235:genetics / Q000254:growth & development*; D015398:Signal Transduction; D013997:Time Factors; D014170:Transformation, Genetic
chemical_list: D018744:DNA, Plant; D010940:Plant Proteins; D012333:RNA, Messenger; D055314:Seed Storage Proteins; D000040:Abscisic Acid; D049308:Dioxygenases; C109043:9-cis-epoxy-carotenoid dioxygenase; D005092:Exonucleases