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GENETICS, GENOMICS, AND MOLECULAR EVOLUTION

RNA Expression Profiles and Data Mining of Sugarcane Response to Low Temperature¹

Centro de Biologia Molecular e Engenharia Genética, Universidade Estadual de Campinas, 13083–970, Campinas, SP, Brazil (F.T.S.N., V.E.D.R., M.M., P.A.); Departamento de Genética e Evolução, Instituto de Biologia, Universidade Estadual de Campinas, 13083–970, Campinas, SP, Brazil (F.T.S.N., V.E.D.R., M.M., P.A.); and Centro de Tecnologia Copersucar, 13400–970, Piracicaba, SP, Brazil (E.C.U.)

Tropical and subtropical plants are generally sensitive to cold and can show appreciable variation in their response to cold stress when exposed to low positive temperatures. Using nylon filter arrays, we analyzed the expression profile of 1,536 expressed sequence tags (ESTs) of sugarcane (Saccharum sp. cv SP80-3280) exposed to cold for 3 to 48 h. Thirty-four cold-inducible ESTs were identified, of which 20 were novel cold-responsive genes that had not previously been reported as being cold inducible, including cellulose synthase, ABI3-interacting protein 2, a negative transcription regulator, phosphate transporter, and others, as well as several unknown genes. In addition, 25 ESTs were identified as being down-regulated during cold exposure. Using a database of cold-regulated proteins reported for other plants, we searched for homologs in the sugarcane EST project database (SUCEST), which contains 263,000 ESTs. Thirty-three homologous putative cold-regulated proteins were identified in the SUCEST database. On the basis of the expression profiles of the cold-inducible genes and the data-mining results, we propose a molecular model for the sugarcane response to low temperature.

¹ This research was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (grant no. 98/12250–0 to P.A.). F.T.S.N. and V.E.R.J. were recipients of fellowships from Fundação de Amparo à Pesquisa do Estado de São Paulo. E.C.U. was the recipient of a fellowship from the Copersucar Technology Center, Universidade Estadual de Campinas.

^* Corresponding author; e-mail parruda{at}unicamp.br; fax 55–19–3788–1089.

Received November 8, 2002; returned for revision January 27, 2003; accepted April 24, 2003.

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