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PLANT PHYSIOLOGY , Vol 111, Issue 1 243-257, Copyright © 1996 by American Society of Plant Biologists

WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY

Transgenic AEQUORIN Reveals Organ-Specific Cytosolic Ca2+ Responses to Anoxia in Arabidopsis thaliana Seedlings

J. C. Sedbrook, P. J. Kronebusch, G. G. Borisy, A. J. Trewavas and P. H. Masson
Laboratory of Genetics, University of Wisconsin-Madison, 445 Henry Mall, Madison, Wisconsin 53706 (J.C.S., P.H.M.)

Using the transgenic AEQUORIN system, we showed that the cotyledons and leaves of Arabidopsis thaliana seedlings developed a biphasic luminescence response to anoxia, indicating changes in cytosolic Ca2+ levels. A fast and transient luminescence peak occurred within minutes of anoxia, followed by a second, prolonged luminescence response that lasted 1.5 to 4 h. The Ca2+ channel blockers Gd3+, La3+, and ruthenium red (RR) partially inhibited the first response and promoted a larger and earlier second response, suggesting different origins for these responses. Both Gd3+ and RR also partially inhibited anaerobic induction of alcohol dehydrogenase gene expression. However, although anaerobic alcohol dehydrogenase gene induction occurred in seedlings exposed to water-agar medium and in roots, related luminescence responses were absent. Upon return to normoxia, the luminescence of cotyledons, leaves, and roots dropped quickly, before increasing again in a Gd3+-, La3+-, ethyleneglycol-bis([beta]-aminoethyl ether)-N,N'-tetraacetic acid-, and RR-sensitive fashion.


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