title: Functional analysis and expressional characterization of rice ankyrin repeat-containing protein, OsPIANK1, in basal defense against Magnaporthe oryzae attack.
abstract: The ankyrin repeat-containing protein gene OsPIANK1 (AK068021) in rice (Oryza sativa L.) was previously shown to be upregulated following infection with the rice leaf blight pathogen Xanthomonas oryzae pv oryzae (Xoo). In this study, we further characterized the role of OsPIANK1 in basal defense against Magnaporthe oryzae (M.oryzae) by 5' deletion analysis of its promoter and overexpression of the gene. The promoter of OsPIANK1 with 1,985 bps in length was sufficient to induce the OsPIANK1 response to inoculation with M.oryzae and to exogenous application of methyl jasmonate (MeJA) or salicylic acid (SA), but not to exogenous application of abscisic acid (ABA). A TCA-element present in the region between -563 bp and -249 bp may be responsible for the OsPIANK1 response to both M.oryzae infection and exogenous SA application. The JERE box, CGTCA-box, and two MYB binding sites locating in the region between -1985 bp and -907 bp may be responsible for the response of OsPIANK1 to exogenous MeJA. OsPIANK1 expression was upregulated after inoculation with M.oryzae and after treatment with exogenous SA and MeJA. Overexpression of OsPIANK1 enhanced resistance of rice to M.oryzae, although it did not confer complete resistance. The enhanced resistance to M.oryzae was accompanied by enhanced transcriptional expression of SA- and JA-dependent genes such as NH1, WKRY13, PAL, AOS2, PR1b, and PR5. This evidence suggests that OsPIANK1 acted as a positive regulator in rice basal defense mediated by SA- and JA-signaling pathways.
authors.affiliation: College of Life Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China.
authors.forename: Shaoliang
authors.initials: S
authors.lastname: Mou
authors.forename: Zhiqin
authors.initials: Z
authors.lastname: Liu
authors.forename: Deyi
authors.initials: D
authors.lastname: Guan
authors.forename: Ailian
authors.initials: A
authors.lastname: Qiu
authors.forename: Yan
authors.initials: Y
authors.lastname: Lai
authors.forename: Shuilin
authors.initials: S
authors.lastname: He
mesh_terms: D021581:Active Transport, Cell Nucleus / Q000187:drug effects; D017089:Ankyrin Repeat; D001483:Base Sequence; D015415:Biomarkers / Q000378:metabolism; D002467:Cell Nucleus / Q000187:drug effects / Q000378:metabolism; D003517:Cyclopentanes / Q000378:metabolism; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D020082:Magnaporthe / Q000502:physiology*; D008969:Molecular Sequence Data; D012275:Oryza / Q000166:cytology / Q000235:genetics* / Q000382:microbiology* / Q000502:physiology; D054883:Oxylipins / Q000378:metabolism; D010937:Plant Growth Regulators / Q000494:pharmacology; D010940:Plant Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000235:genetics; D020156:Salicylic Acid / Q000378:metabolism; D017384:Sequence Deletion; D015398:Signal Transduction / Q000187:drug effects
chemical_list: D015415:Biomarkers; D003517:Cyclopentanes; D054883:Oxylipins; D010937:Plant Growth Regulators; D010940:Plant Proteins; C011006:jasmonic acid; D020156:Salicylic Acid
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