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Plant and Cell Physiology Advance Access originally published online on May 6, 2005
Plant and Cell Physiology 2005 46(7):1154-1160; doi:10.1093/pcp/pci114
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JSPP © 2005

Short Communication

Regulation of TOP2 by Various Abiotic Stresses Including Cold and Salinity in Pea and Transgenic Tobacco Plants

Gardhi H. C. M. Hettiarachchi1,2, Malireddy K. Reddy2, Sudhir K. Sopory2 and Sudip Chattopadhyay1,*

1 National Center for Plant Genome Research, JNU Campus, PO Box 10531, New Delhi, 110067, India
2 International Center for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi, 110067, India

* Corresponding author: E-mail, sudipchatto{at}yahoo.com, Fax, +91-11-2671-6658.

Although abiotic stress affects plant growth and development, demonstration of its direct effect on regulation of the components of the DNA replication machinery is largely unknown. In this work, we demonstrate that the expression of TOP2 (encoding topoisomerase II) is up-regulated by various abiotic stresses including salinity and low temperature, and phytohormones such as ABA (abscisic acid) and SA (salicylic acid). Transgenic studies with different deletion versions of the TOP2 promoter in tobacco define several promoter determinants responsible for specific abiotic stress responsiveness. Taken together, these results demonstrate a direct involvement of stress in the transcriptional regulation of TOP2.

(Received February 24, 2005; Accepted April 19, 2005)
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