The present invention relates to a protein (Snow1), mutants thereof, and nucleic acids encoding said protein, that interacts with Ice1 and which activates CBF3 promoter activity thus regulating freezing tolerance in plants.
1. An isolated polynucleotide, which encodes a protein consisting of the amino acid sequence of SEQ ID NO:2.
2. A vector comprising the isolated polynucleotide of claim 1 .
3. A host cell comprising the isolated polynucleotide of claim 1 .
4. A plant cell comprising the isolated polynucleotide of claim 1 .
5. A transgenic plant comprising the isolated polynucleotide sequence of claim 1 .
6. The transgenic plant of claim 5 , wherein said plant is Arabidopsis thaliania.
7. The transgenic plant of claim 5 , wherein said plant is selected from the group consisting of wheat, corn, peanut cotton, oat, and soybean plant.
8. The transgenic plant of claim 5 , wherein the isolated polynucleotide is operably linked to an inducible promoter.