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Plant and Cell Physiology, 2003, Vol. 44, No. 1 10-15
© 2003 Oxford University Press

CIP353 Encodes an AP2/ERF-Domain Protein in Potato (Solanum tuberosum L.) and Responds Slowly to Cold Stress

Toshiki Mine1,2, Toru Hiyoshi1,2, Keisuke Kasaoka1,3 and Akio Ohyama1,2,4,5

1 Plant Breeding and Genetics Research Laboratory, Japan Tobacco Inc., 700 Higashibara, Toyoda, Iwata, Shizuoka, 438-0802 Japan
2 Orynova K.K., 700 Higashibara, Toyoda, Iwata, Shizuoka, 438-0802 Japan
3 Leaf Tobacco Research Laboratory, Japan Tobacco Inc., 1900 Idei, Oyama, Tochigi, 323-0802 Japan
4 National Institute of Vegetable and Tea Science (NIVTS), National Agricultural Research Organization (NARO), 360 Kusawa, Ano, Mie 514-2392 Japan

We isolated the CIP353 cDNA, which encodes a novel cold-inducible protein, from cold-stored tubers of potato (Solanum tuberosum L.). The level of CIP353 transcripts began to increase in tubers 2 weeks after storage at 3°C and continued increasing for at least 3 months during storage. This increase was not observed in tubers stored at >=9°C. The increased level of transcripts in tubers stored at 3 or 6°C decreased when the tubers were shifted to 20°C. These data suggest that CIP353 is a temperature-dependent and slowly responsive cold-inducible gene of potato. The middle of the deduced amino acid sequence of CIP353 cDNA showed high similarity to the AP2/ERF domain, which occurs in some plant regulatory factors. The deduced protein contained a putative basic nuclear-localization signal and potential acidic activation domains. These data suggest that CIP353 protein is a transcription factor of genes expressed in tubers under long-term storage at low temperatures.

5 Corresponding author: E-mail, aohyama@affrc.go.jp; Fax, +81-59-268-1339.


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