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PLANT PHYSIOLOGY , Vol 103, Issue 3 877-883, Copyright © 1993 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
Cytochrome and Alternative Pathway Respiration in Tobacco (Effects of Salicylic Acid)
D. M. Rhoads and L. McIntosh
Michigan State University-Department of Energy Plant Research Laboratory and Biochemistry Department, Michigan State University, East Lansing, Michigan 48824
In suspension cultures of NT1 tobacco (Nicotiana tabacum L. cv Bright
Yellow) cells the cytochrome pathway capacity increased between d 3 and d 4
following subculturing and reached the highest level observed on d 7. The
capacity decreased significantly by d 10 and was at the same level on d 14.
Both alternative pathway capacity and the amount of the 35-kD alternative
oxidase protein increased significantly between d 5 and d 6, reached the
highest point observed on d 7, remained constant until d 10, and decreased
by d 14. The highest capacities of the alternative and cytochrome pathways
and the highest amount of the 35-kD protein were attained on the day that
cell cultures reached a stationary phase of growth. Addition of salicylic
acid to cell cultures on d 4 caused a significant increase in alternative
pathway capacity and a dramatic accumulation of the 35-kD protein by 12 h.
The alternative pathway capacity and the protein level reached the highest
level observed by 16 h after salicylic acid addition, and the cytochrome
pathway capacity was at about the same level at each time point. The
accumulation of the 35-kD alternative oxidase protein was significantly
decreased by addition of actinomycin D 1 h before salicylic acid and was
blocked by addition of cycloheximide. These results indicate that de novo
transcription and translation were necessary for salicylic acid to cause
the maximum accumulation of the 35-kD protein.
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