Abstract
Rapid alkalinization factor (RALF) is part of a growing family of small peptides with hormone characteristics in plants. Initially isolated from leaves of tobacco plants, RALF peptides can be found throughout the plant kingdom and they are expressed ubiquitously in plants. We took advantage of the small gene family size of RALF genes in sugarcane and the ordered cellular growth of the grass sugarcane leaves to gain information about the function of RALF peptides in plants. Here we report the isolation of two RALF peptides from leaves of sugarcane plants using the alkalinization assay. SacRALF1 was the most abundant and, when added to culture media, inhibited growth of microcalli derived from cell suspension cultures at concentrations as low as 0.1 μM. Microcalli exposed to exogenous SacRALF1 for 5 days showed a reduced number of elongated cells. Only four copies of SacRALF genes were found in sugarcane plants. All four SacRALF genes are highly expressed in young and expanding leaves and show a low or undetectable level of expression in expanded leaves. In half-emerged leaf blades, SacRALF transcripts were found at high levels at the basal portion of the leaf and at low levels at the apical portion. Gene expression analyzes localize SacRALF genes in elongation zones of roots and leaves. Mature leaves, which are devoid of expanding cells, do not show considerable expression of SacRALF genes. Our findings are consistent with SacRALF genes playing a role in plant development potentially regulating tissue expansion.
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Becker JD, Boavida LC, Carneiro J, Haury M, Feijo JA (2003) Transcriptional profiling of arabidopsis tissues reveals the unique characteristics of the pollen transcriptome. Plant Physiol 133:713–725
Cheng J, Seeley KA, Sung ZR (1995) RML7 and RML2, Arabidopsis genes required for cell proliferation at the root tip. Plant Physiol 107:365–376
Dickison WC (2000) Integrative plant anatomy. Academic Press, New York
Escobar NM, Haupt S, Thow G, Boevink P, Chapman S, Oparka K (2003) High-throughput viral expression of cDNA-green fluorescent protein fusions reveals novel subcellular addresses and identifies unique proteins that interact with plasmodesmata. Plant Cell 15:1507–1523
Falco MC, Tulmann Neto A, Mendes BMJ, Zapata-Arias FJ (1996) Isolation and cultivation of sugarcane protoplasts. Braz J Plant Physiol 8:175–179
Gendreau E, Traas J, Desnos T, Grandjean O, Caboche M, Höfte H (1997) Cellular basis of hypocotyl growth in Arabidopsis thaliana. Plant Physiol 114:295–305
Germain H, Chevalier E, Caron S, Matton DP (2005) Characterization of five RALF-like from Solanun chacoense provides support for a developmental role in plants. Planta 220:447–454
Grivet L, Arruda P (2002) Sugarcane genomics: depicting the complex genome of an important tropical crop. Curr Opin Plant Biol 5:122–127
Haruta M, Constabel CP (2003) Rapid alkalinization factors in poplar cell cultures. Peptide isolation, cDNA cloning, and differential expression in leaves and methyl jasmonate-treated cells. Plant Physiol 131:814–823
Haruta M, Monshausen G, Gilroy S, Sussman MR (2008) A Cytoplasmic Ca2+ functional assay for identifying and purifying endogenous cell signaling peptides in Arabidopsis seedlings: identification of AtRALF1 peptide. Biochemistry 47:6311–6321
Iskandar HM, Simpson RS, Casu RE, Bonnett GD, Maclean DJ, Manners JM (2004) Comparison of reference genes for quantitative real-time polymerase chain reaction analysis of gene expression in sugarcane. Plant Mol Biol Rep 22:325–337
Laemmli UK (1970) Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature 227:680–685
Matos JM, Fiori CS, Silva-Filho MC, Moura DS (2008) A conserved dibasic site is essential for correct processing of the peptide hormone AtRALF1 in Arabidopsis thaliana. FEBS Lett 582:3343–3347
McCubbin AG, Lee C, Hetrick A (2006) Identification of genes showing differential expression between morphs in developing flowers of Primula vulgaris. Sex Plant Reprod 19:63–72
Moore PH (1987) Anatomy and morphology. In: Heinz DJ (ed) Sugarcane improvement through breeding. Elsevier Science, New York, pp 85–143
Olsen AN, Mundy J, Skriver K (2002) Peptomics, identification of novel cationic Arabidopsis peptides with conserved sequence motifs. In Silico Biol 2:441–451
Pearce G, Ryan CA (2003) Systemic signaling in tomato plants for defense against herbivores. Isolation and characterization of three novel defense-signaling glycopeptide hormones coded in a single precursor gene. J Biol Chem 278:30044–30050
Pearce G, Moura DS, Stratmann J, Ryan CA (2001a) RALF, a 5-kDa ubiquitous polypeptide in plants, arrests root growth and development. Proc Natl Acad Sci USA 98:12843–12847
Pearce G, Moura DS, Stratmann J, Ryan CA (2001b) Production of multiple plant hormones from a single polyprotein precursor. Nature 411:817–820
Pfaffl MW (2001) A new mathematical model for relative quantification in real-time RT-PCR. Nucleic Acids Res 29:2001–2007
Scheer JM, Pearce G, Ryan CA (2005) LeRALF, a plant peptide that regulates root growth and development, specifically binds to 25 and 120 kDa cell surface membrane proteins of Lycopersicon peruvianum. Planta 221:667–674
Silverstein KA, Graham MA, VandenBosch KA (2006) Novel paralogous gene families with potential function in legume nodules and seeds. Curr Opin Plant Biol 9:142–146
Srivastava R, Liu J, Guo H, Yin Y, Howell SH (2009) Regulation and processing of a plant peptide hormone, AtRALF23, in Arabidopsis. Plant J 59:930–939
Vettore AL, da Silva FR, Kemper EL, Souza GM, da Silva AM, Ferro MI, Henrique-Silva F, Giglioti EA, Lemos MV, Coutinho LL, Nobrega MP, Carrer H, França SC, Bacci Júnior M, Goldman MH, Gomes SL, Nunes LR, Camargo LE, Siqueira WJ, Van Sluys MA, Thiemann OH, Kuramae EE, Santelli RV, Marino CL, Targon ML, Ferro JA, Silveira HC, Marini DC, Lemos EG, Monteiro-Vitorello CB, Tambor JH, Carraro DM, Roberto PG, Martins VG, Goldman GH, de Oliveira RC, Truffi D, Colombo CA, Rossi M, de Araujo PG, Sculaccio SA, Angella A, Lima MM, de Rosa Júnior VE, Siviero F, Coscrato VE, Machado MA, Grivet L, Di Mauro SM, Nobrega FG, Menck CF, Braga MD, Telles GP, Cara FA, Pedrosa G, Meidanis J, Arruda P (2003) Analysis and functional annotation of an expressed sequence tag collection for tropical crop sugarcane. Genome Res 13:2725–2735
Weigel D, Glazebrook J (2002) Arabidopsis: a laboratory manual. Cold Spring Harbor Laboratory Press, Cold Spring Harbor
Wold F (1981) In vivo chemical modification of proteins (post-translational modification). Annu Rev Biochem 50:783–814
Wu J, Kurten EL, Monshausen G, Hummel GM, Gilroy S, Baldwin IT (2007) NaRALF, a peptide signal essential for the regulation of root hair tip apoplastic pH in Nicotiana attenuata, is required for root hair development and plant growth in native soils. Plant J 52:877–890
Acknowledgments
The authors thank Gregory Pearce (Washington State University, Pullman, WA) for helpful discussions on peptide purification. Prof. Antonio Figueira (CENA/USP, Piracicaba, Brazil) for Real-time PCR facilities. Dr. Kathy Stone and Dr. Tom Abbott from the Yale Cancer Center Mass Spectrometry Resource and W. M. Keck Foundation Biotechnology Resource Laboratory Keck facility for LC MS/MS analysis. This research was supported by Fundação de Amparo a Pesquisa do Estado de São Paulo, FAPESP projects 02/08661-1, 08/11109-5 and the Bioenergy Program (08/52067-3)- BIOEN. F.B.M. was supported by graduate fellowship from CAPES. J.L.M., A.P.R. and A.H.M. were supported by fellowships from FAPESP. M.C.S.F. is a research fellow of CNPq. D.S.M. is recipient of a Young Researcher Grant from FAPESP.
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Mingossi, F.B., Matos, J.L., Rizzato, A.P. et al. SacRALF1, a peptide signal from the grass sugarcane (Saccharum spp.), is potentially involved in the regulation of tissue expansion. Plant Mol Biol 73, 271–281 (2010). https://doi.org/10.1007/s11103-010-9613-8
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DOI: https://doi.org/10.1007/s11103-010-9613-8