Complementary interactions between oxidative stress and auxins control plant growth responses at plant, organ, and cellular level.
Plant stress responses are a key factor in steering the development of cells, tissues, and organs. However, the stress-induced signal transduction cascades that control localized growth and cell size/differentiation are not well understood. It is reported here that oxidative stress, exerted by paraquat or alloxan, induced localized cell proliferation in intact seedlings, in isolated root segments, and at the single cell level. Analysis of the stress-induced mitotic activity revealed that oxidative stress enhances auxin-dependent growth cycle reactivation. Based on the similarities between responses at plant, tissue, or single cell level, it is hypothesized that a common mechanism of reactive oxygen species enhanced auxin-responsiveness underlies the stress-induced re-orientation of growth, and that stress-induced effects on the protoplast growth cycle are directly relevant in terms of understanding whole plant behaviour.
Pasternak
Taras
T
Institute of Cell Biology and Genetic Engineering, National Academy of Science of Ukraine, Zabolotnogo str. 148, U-03650 Kiev, Ukraine.
Potters
Geert
G
Caubergs
Roland
R
Jansen
Marcel A K
MA
D000496:Alloxan / Q000494:pharmacology; D017360:Arabidopsis / Q000254:growth & development*; D001205:Ascorbic Acid / Q000378:metabolism; D002454:Cell Differentiation / Q000187:drug effects; D018525:Germination / Q000187:drug effects; D005978:Glutathione / Q000378:metabolism; D006540:Herbicides / Q000494:pharmacology; D007210:Indoleacetic Acids / Q000494:pharmacology / Q000502:physiology*; D018384:Oxidative Stress / Q000502:physiology*; D010269:Paraquat / Q000494:pharmacology; D018515:Plant Leaves / Q000166:cytology / Q000187:drug effects; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development*; D011523:Protoplasts / Q000378:metabolism*; D036226:Seedlings / Q000187:drug effects / Q000254:growth & development*; D012639:Seeds / Q000254:growth & development
D006540:Herbicides; D007210:Indoleacetic Acids; D000496:Alloxan; C030737:indoleacetic acid; D005978:Glutathione; D010269:Paraquat; D001205:Ascorbic Acid