title: A pollen-specific RALF from tomato that regulates pollen tube elongation.
abstract: Rapid Alkalinization Factors (RALFs) are plant peptides that rapidly increase the pH of plant suspension cell culture medium and inhibit root growth. A pollen-specific tomato (Solanum lycopersicum) RALF (SlPRALF) has been identified. The SlPRALF gene encodes a preproprotein that appears to be processed and released from the pollen tube as an active peptide. A synthetic SlPRALF peptide based on the putative active peptide did not affect pollen hydration or viability but inhibited the elongation of normal pollen tubes in an in vitro growth system. Inhibitory effects of SlPRALF were detectable at concentrations as low as 10 nm, and complete inhibition was observed at 1 mum peptide. At least 10-fold higher levels of alkSlPRALF, which lacks disulfide bonds, were required to see similar effects. A greater effect of peptide was observed in low-pH-buffered medium. Inhibition of pollen tube elongation was reversible if peptide was removed within 15 min of exposure. Addition of 100 nm SlPRALF to actively growing pollen tubes inhibited further elongation until tubes were 40 to 60 mum in length, after which pollen tubes became resistant to the peptide. The onset of resistance correlated with the timing of the exit of the male germ unit from the pollen grain into the tube. Thus, exogenous SlPRALF acts as a negative regulator of pollen tube elongation within a specific developmental window.
authors.affiliation: Department of Biology, Colorado State University, Fort Collins, Colorado 80523-1878, USA.
authors.forename: Paul A
authors.initials: PA
authors.lastname: Covey
authors.forename: Chalivendra C
authors.initials: CC
authors.lastname: Subbaiah
authors.forename: Ronald L
authors.initials: RL
authors.lastname: Parsons
authors.forename: Gregory
authors.initials: G
authors.lastname: Pearce
authors.forename: Fung T
authors.initials: FT
authors.lastname: Lay
authors.forename: Marilyn A
authors.initials: MA
authors.lastname: Anderson
authors.forename: Clarence A
authors.initials: CA
authors.lastname: Ryan
authors.forename: Patricia A
authors.initials: PA
authors.lastname: Bedinger
mesh_terms: D000595:Amino Acid Sequence; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D018525:Germination; D018551:Solanum lycopersicum / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D036361:Peptide Hormones / Q000235:genetics / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D053205:Pollen Tube / Q000254:growth & development*; D011498:Protein Precursors / Q000235:genetics / Q000378:metabolism; D018749:RNA, Plant / Q000235:genetics; D016415:Sequence Alignment; D020798:Two-Hybrid System Techniques
chemical_list: D036361:Peptide Hormones; D010940:Plant Proteins; D011498:Protein Precursors; D018749:RNA, Plant
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