Plant Physiol. Drug Metab Dispos
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Plant Physiology 88:242-244 (1988)
© 1988 American Society of Plant Biologists

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Molecular Biology and Gene Regulation

Phytochrome-Mediated Light Regulation of Nitrate Reductase Expression in Squash Cotyledons 1

V. K. Rajasekhar2, G. Gowri and Wilbur H. Campbell

Department of Biological Sciences and Center for Plant Biotechnology, Michigan Technological University, Houghton, Michigan 49931

In etiolated squash (Cucurbita maxima L.) cotyledons, nitrate-inducible NADH:nitrate reductase activity and protein were increased in darkness by red light pulses with red/far-red photoreversibility. Continuous far-red light also led to increased levels of nitrate reductase activity and protein. Poly(A)+RNA, which hybridizes to squash nitrate reductase cDNA, was also increased by light treatments. Thus, we found that after nitrate triggering, nitrate reductase expression appears to be regulated by light via phytochrome.

2 Present address: Department of Molecular Biology and Biochemistry, University of California, Irvine, CA 92717.

1 Supported by Grant 86 CRCR 11289 from the United States Department of Agriculture, Competitive Research Grants Office and Grant DMB 85-02672 from the National Science Foundation.




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[Abstract] [Full Text] [PDF]


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