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PLANT PHYSIOLOGY , Vol 105, Issue 1 53-60, Copyright © 1994 by American Society of Plant Biologists
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ENVIRONMENTAL AND STRESS PHYSIOLOGY |
The Response of Maize Seedlings of Different Ages to Hypoxic and Anoxic Stress (Changes in Induction of Adh1 mRNA, ADH Activity, and Survival of Anoxia)
D. L. Andrews, M. C. Drew, J. R. Johnson and B. G. Cobb
Department of Horticultural Science, Texas A&M University, College Station, Texas 77843-2133
Previously we showed that there is only a transient induction of alcohol
dehydrogenase 1 (Adh1) transcripts and only a small induction of alcohol
dehydrogenase (ADH) enzyme activity in root tips of maize (Zea mays L.)
seedlings subjected to strict anaerobiosis without prior acclimation by
exposure to low O2 (D.L. Andrews, B.G. Cobb, J.R. Johnson, M.C. Drew [1993]
Plant Physiol 101: 403-414). Acclimation of root tips of seedlings by low
O2 before anoxia appeared to be necessary for full induction of ADH. Here
we have examined the effect of seedling age on changes in the protein
content, induction of Adh1 transcripts, and ADH enzyme activity in 5-mm
root tips, root axes, and shoots of maize (cv TX5855). Their ability to
survive anoxia was also recorded. Some seedlings were sparged with 4% O2
for 6 or 18 h (a hypoxic pretreatment) followed by anoxia (sparged with N2)
for up to 48 h. Other seedlings were not acclimated before anoxia. In
general, younger seedlings had higher initial (aerobic) levels of total
protein, Adh1 transcripts, and ADH activity than did seedlings that were 2
d older. For younger seedlings, anoxia alone induced Adh1 transcripts,
which reached a peak within 6 to 12 h, whereas ADH activity increased
throughout the 48-h treatment. For older seedlings, anoxia caused only a
small, transient induction of Adh1 transcripts or ADH activity. For
seedlings of either age, hypoxia induced Adh1 transcripts and ADH activity,
both of which were increased further by subsequent anoxia in the younger
seedlings but to a lesser extent in the older seedlings. Despite
differences in ADH activity, roots of seedlings of either age showed a
similar resistance to anoxia. Thus, acclimation of maize seedlings to
survive anoxia does not appear to be related to induction of high levels of
ADH activity.
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