A novel rice (Oryza sativa L.) acidic PR1 gene highly responsive to cut, phytohormones, and protein phosphatase inhibitors.
A novel rice acidic pathogenesis-related (PR) class 1 cDNA (OsPR1a) was isolated from jasmonic acid (JA)-treated rice seedling leaf. The OsPR1a cDNA is 830 bp long and contains an open reading frame of 507 nucleotides encoding 168 amino acid residues with a predicted molecular mass of 17,560 and pI of 4.4. The deduced amino acid sequence of OsPR1a has a high level of identity with acidic and basic PR1 proteins from plants. Southern analysis revealed that OsPR1a is a member of a multigene family. The OsPR1a gene was found to be cut-inducible, whereas the phytohormones JA, salicylic acid (SA), 3-indoleacetic acid, gibberellin, and ethylene (using ethylene generator ethephon, ET) enhanced accumulation of OsPR1a transcript, as well as the protein phosphatase inhibitors cantharidin (CN) and endothall (EN). Induced expression of OsPR1a gene by JA, CN or EN, and ET was light/dark- and dose-dependent and was almost completely inhibited by cycloheximide. Dark downregulated CN-, EN-, and ET-induced OsPR1a gene expression, whereas it was further enhanced with JA. SA and abscisic acid blocked JA-induced OsPR1a transcript. Simultaneous application of staurosporine (ST) enhances CH- or EN-induced OsPR1a transcript, but not with JA. This is the first report on cloning of a rice acidic PR1 gene (OsPR1a), which is regulated by phytohormones, phosphorylation/dephosphorylation event(s), and light.
Agrawal
G K
GK
Research Laboratory for Agricultural Biotechnology and Biochemistry (RLABB), Kathmandu, Nepal. gkanitu@abr.affrc.go.jp
Jwa
N S
NS
Rakwal
R
R
D000040:Abscisic Acid / Q000494:pharmacology; D000595:Amino Acid Sequence; D001483:Base Sequence; D002193:Cantharidin / Q000494:pharmacology; D003001:Cloning, Molecular; D003513:Cycloheximide / Q000494:pharmacology; D018076:DNA, Complementary / Q000378:metabolism; D003998:Dicarboxylic Acids / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D015536:Down-Regulation; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005030:Ethylenes / Q000494:pharmacology; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D015723:Gene Library; D005875:Gibberellins / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D007210:Indoleacetic Acids / Q000494:pharmacology; D007641:Keratolytic Agents / Q000494:pharmacology; D008027:Light; D008969:Molecular Sequence Data; D005810:Multigene Family; D012275:Oryza / Q000235:genetics / Q000378:metabolism; D010766:Phosphorylation / Q000187:drug effects; D010937:Plant Growth Regulators / Q000494:pharmacology; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism*; D011500:Protein Synthesis Inhibitors / Q000494:pharmacology; D012333:RNA, Messenger / Q000378:metabolism; D020156:Salicylic Acid / Q000494:pharmacology; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D019311:Staurosporine / Q000494:pharmacology; D013997:Time Factors; D014158:Transcription, Genetic / Q000187:drug effects
D018076:DNA, Complementary; D003998:Dicarboxylic Acids; D004791:Enzyme Inhibitors; D005030:Ethylenes; D005875:Gibberellins; D007210:Indoleacetic Acids; D007641:Keratolytic Agents; D010937:Plant Growth Regulators; D010940:Plant Proteins; D011500:Protein Synthesis Inhibitors; D012333:RNA, Messenger; C053376:pathogenesis-related proteins, plant; C100030:endothall; D000040:Abscisic Acid; C036216:ethylene; D003513:Cycloheximide; D019311:Staurosporine; D002193:Cantharidin; D020156:Salicylic Acid