title: A soybean acyl carrier protein, GmACP, is important for root nodule symbiosis.
abstract: Legumes (members of family Fabaceae) establish a symbiotic relationship with nitrogen-fixing soil bacteria (rhizobia) to overcome nitrogen source limitation. Single root hair epidermal cells serve as the entry point for bacteria to infect the host root, leading to development of a new organ, the nodule, which the bacteria colonize. In the present study, the putative role of a soybean acyl carrier protein (ACP), GmACP (Glyma18g47950), was examined in nodulation. ACP represent an essential cofactor protein in fatty acid biosynthesis. Phylogenetic analysis of plant ACP protein sequences showed that GmACP was classified in a legume-specific clade. Quantitative reverse-transcription polymerase chain reaction analysis demonstrated that GmACP was expressed in all soybean tissues but showed higher transcript accumulation in nodule tissue. RNA interference-mediated gene silencing of GmACP resulted in a significant reduction in nodule numbers on soybean transgenic roots. Fluorescent protein-labeled GmACP was localized to plastids in planta, the site of de novo fatty acid biosynthesis in plants. Analysis of the fatty acid content of root tissue silenced for GmACP expression, as determined by gas chromatography-mass spectrometry, showed an approximately 22% reduction, specifically in palmitic and stearic acid. Taken together, our data provide evidence that GmACP plays an important role in nodulation.
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Katalin
authors.initials: K
authors.lastname: Tóth
authors.forename: Kiwamu
authors.initials: K
authors.lastname: Tanaka
authors.forename: Cuong T
authors.initials: CT
authors.lastname: Nguyen
authors.forename: Zhe
authors.initials: Z
authors.lastname: Yan
authors.forename: Laurent
authors.initials: L
authors.lastname: Brechenmacher
authors.forename: Jeremy
authors.initials: J
authors.lastname: Dahmen
authors.forename: Mingjie
authors.initials: M
authors.lastname: Chen
authors.forename: Jay J
authors.initials: JJ
authors.lastname: Thelen
authors.forename: Lijuan
authors.initials: L
authors.lastname: Qiu
authors.forename: Gary
authors.initials: G
authors.lastname: Stacey
mesh_terms: D000213:Acyl Carrier Protein / Q000145:classification / Q000235:genetics* / Q000378:metabolism; D000595:Amino Acid Sequence; D001483:Base Sequence; D018506:Gene Expression Regulation, Plant; D017930:Genes, Reporter; D008969:Molecular Sequence Data; D005810:Multigene Family; D009586:Nitrogen Fixation; D019308:Palmitic Acid / Q000378:metabolism; D010802:Phylogeny; D010940:Plant Proteins / Q000145:classification / Q000235:genetics / Q000378:metabolism; D055170:Plant Root Nodulation; D018517:Plant Roots / Q000166:cytology / Q000235:genetics / Q000382:microbiology / Q000502:physiology; D030821:Plants, Genetically Modified; D012231:Rhizobium / Q000502:physiology*; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D013025:Glycine max / Q000166:cytology / Q000235:genetics* / Q000382:microbiology / Q000502:physiology; D013229:Stearic Acids / Q000378:metabolism; D013559:Symbiosis; D014026:Nicotiana / Q000235:genetics / Q000378:metabolism
chemical_list: D000213:Acyl Carrier Protein; D010940:Plant Proteins; D013229:Stearic Acids; D019308:Palmitic Acid; C031183:stearic acid