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A full-length cDNA LeCPK2 (GenBank GQ205414) from tomato (Solanum lycopersicum) encoding a calcium-dependent protein kinase (CDPK) was cloned by in silico cloning using NtCPK5 (AY971376) as a virtual probe. The deduced amino acid sequence of LeCPK2 contained the kinase, autoinhibitory, and calmodulin-like domains typical of CDPKs. Expression profiling indicated that LeCPK2 expressed predominantly in flowers and responded divergently to heat and cold stress, in which obvious mRNA accumulation was detected at 4 h under 42 degrees C stress, but no change in LeCPK2 mRNA levels was observed in 6 h at 4 degrees C. Mechanical wounding and phytohormones including ethylene, methyl jasmonate, and salicylic acid were also observed to arouse the expression of LeCPK2 in a similar pattern. mRNA accumulation was enhanced at 30 min and reached a maximum at 3 h, followed by a decrease to the normal level. All the results suggest that LeCPK2 is a novel versatile isoform of tomato CDPKs.

bioscience, biotechnology, and biochemistry

Expression Profiling of a Novel Calcium-Dependent Protein Kinase Gene,<i>LeCPK2</i>, from Tomato (<i>Solanum lycopersicum</i>) under Heat and Pathogen-Related Hormones

Expression Profiling of a Novel Calcium-Dependent Protein Kinase Gene,LeCPK2, from Tomato (Solanum lycopersicum) under Heat and Pathogen-Related Hormones