Arabidopsis roots and shoots have different mechanisms for hypoxic stress tolerance.
Arabidopsis has inducible responses for tolerance of O2 deficiency. Plants previously exposed to 5% O2 were more tolerant than the controls to hypoxic stress (0.1% O2 for 48 h) in both roots and shoots, but hypoxic acclimation did not improve tolerance to anoxia (0% O2). The acclimation of shoots was not dependent on the roots: increased shoot tolerance was observed when the roots of the plants were removed. An adh (alcohol dehydrogenase) null mutant did not show acclimation of the roots but retained the shoot survival response. Abscisic acid treatment also differentiated the root and shoot responses; pretreatment induced root survival in hypoxic stress conditions (0.1% O2) but did not induce any increase in the survival of shoots. Cycloheximide blocked both root and shoot acclimation, indicating that both acclimation mechanisms are dependent on protein synthesis.
Ellis
M H
MH
Commonwealth Scientific and Industrial Research Organization, Division of Plant Industry, G.P.O. Box 1600, Canberra ACT 2601, Australia.
Dennis
E S
ES
Peacock
W J
WJ
D000040:Abscisic Acid / Q000494:pharmacology; D000064:Acclimatization / Q000187:drug effects / Q000502:physiology; D000426:Alcohol Dehydrogenase / Q000235:genetics; D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D003513:Cycloheximide / Q000494:pharmacology; D000860:Hypoxia / Q000378:metabolism; D009154:Mutation; D010937:Plant Growth Regulators / Q000494:pharmacology; D018517:Plant Roots / Q000378:metabolism; D018520:Plant Shoots / Q000378:metabolism; D011500:Protein Synthesis Inhibitors / Q000494:pharmacology
D010937:Plant Growth Regulators; D011500:Protein Synthesis Inhibitors; D000040:Abscisic Acid; D003513:Cycloheximide; D000426:Alcohol Dehydrogenase