title: Identification and functional characterization of a rice NAC gene involved in the regulation of leaf senescence.
abstract: BACKGROUND
  As the final stage of leaf development, leaf senescence may cause the decline of photosynthesis and gradual reduction of carbon assimilation, which makes it a possible limiting factor for crop yield. NACs are plant-specific transcription factors and some NACs have been confirmed to play important roles in regulating leaf senescence.
  
  
  RESULTS
  In this study, we reported a member of the NAC transcription factor family named OsNAP whose expression is associated with leaf senescence, and investigated its preliminary function during the process of leaf senescence. The results of qRT-PCR showed that the OsNAP transcripts were accumulated gradually in response to leaf senescence and treatment with methyl jasmonic acid (MeJA). A subcellular localization assay indicated that OsNAP is a nuclear-localized protein. Yeast one-hybrid experiments indicated that OsNAP can bind the NAC recognition site (NACRS)-like sequence. OsNAP-overexpressing transgenic plants displayed an accelerated leaf senescence phenotype at the grain-filling stage, which might be caused by the elevated JA levels and the increased expression of the JA biosynthesis-related genes LOX2 and AOC1, and showed enhanced tolerance ability to MeJA treatment at the seedling stage. Nevertheless, the leaf senescence process was delayed in OsNAP RNAi transgenic plants with a dramatic drop in JA levels and with decreased expression levels of the JA biosynthesis-related genes AOS2, AOC1 and OPR7.
  
  
  CONCLUSIONS
  These results suggest that OsNAP acts as a positive regulator of leaf senescence and this regulation may occur via the JA pathway.
authors.affiliation: National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, 430070, China. yongjunlin@mail.hzau.edu.cn.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhou
authors.forename: Weifeng
authors.initials: W
authors.lastname: Huang
authors.forename: Li
authors.initials: L
authors.lastname: Liu
authors.forename: Taiyu
authors.initials: T
authors.lastname: Chen
authors.forename: Fei
authors.initials: F
authors.lastname: Zhou
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Lin
mesh_terms: D000375:Aging / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D018506:Gene Expression Regulation, Plant; D012275:Oryza / Q000235:genetics* / Q000378:metabolism*; D018515:Plant Leaves / Q000235:genetics / Q000378:metabolism* / Q000502:physiology*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D030821:Plants, Genetically Modified / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D010940:Plant Proteins
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