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THE PLANT CELL, Vol 4, Issue 9 1131-1139, Copyright © 1992 by American Society of Plant Biologists
Salicylic Acid Regulation of Respiration in Higher Plants: Alternative Oxidase Expression
D. M. Rhoads and L. McIntosh
Department of Energy Plant Research Laboratory and Department of Biochemistry, Michigan State University, East Lansing, Michigan 48824
Alternative respiratory pathway capacity increases during the development
of the thermogenic appendix of a voodoo lily inflorescence. The levels of
the alternative oxidase proteins increased dramatically between D-4 (4 days
prior to the day of anthesis) and D-3 and continued to increase until the
day of anthesis (D-day). The level of salicylic acid (SA) in the appendix
is very low early on D-1, but increases to a high level in the evening of
D-1. Thermogenesis occurs after a few hours of light on D-day. Therefore,
the initial accumulation of the alternative oxidase proteins precedes the
increase in SA by 3 days, indicating that other regulators may be involved.
A 1.6-kb transcript encoding the alternative oxidase precursor protein
accumulated to a high level in the appendix tissue by D-1. Application of
SA to immature appendix tissue caused an increase in alternative pathway
capacity and a dramatic accumulation of the alternative oxidase proteins
and the 1.6-kb transcript. Time course experiments showed that the increase
in capacity, protein levels, and transcript level corresponded precisely.
The response to SA was blocked by cycloheximide or actinomycin D,
indicating that de novo transcription and translation are required.
However, nuclear, in vitro transcription assays indicated that the
accumulation of the 1.6-kb transcript did not result from a simple increase
in the rate of transcription of aox1.
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