Recovery from drought stress in tobacco: An active process associated with the reversal of senescence in some plant parts and the sacrifice of others

0380747 - ÚEB 2013 RIV US eng J - Journal Article
Vaňková, Radomíra - Dobrá, Jana - Štorchová, Helena
Recovery from drought stress in tobacco: An active process associated with the reversal of senescence in some plant parts and the sacrifice of others.
Plant Signaling & Behavior. Roč. 7, č. 1 (2012), s. 19-21. ISSN 1559-2316. E-ISSN 1559-2324
R&D Projects: GA ČR GA206/09/2062; GA ČR GA522/09/2058; GA MŠMT 2B08058
Institutional research plan: CEZ:AV0Z50380511
Keywords : drought stress * senescence * tobacco
Subject RIV: ED - Physiology

Plant response to water deficit and subsequent re-watering is fine tuned at the whole plant level. It differs not only between shoot and root, but also among particular leaves along a plant axis. We estimated the expression of proline metabolism-related genes and the activity of senescence-related promoter in roots and individual leaves of tobacco plants in the course of drought stress and recovery. Proline plays the dual role of an osmoprotectant and an antioxidant under water deficit. High proline concentration in the youngest uppermost leaves contributed to their protection from drought, which was associated with low degree of senescence. During recovery, elevated proline concentrations persisted and the senescence-related promoter was switched off in all surviving leaves. Two mutually exclusive scenarios were followed by tobacco leaves on recovery—restoration of photosynthesis and metabolism, or death, depending on the progress of senescence.
Permanent Link: http://hdl.handle.net/11104/0211378