Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 41, Issue 2, Pages 189-192Publisher
EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/S0981-9428(02)00021-9
Keywords
transpiration; homoserine lactone; homoserine; lumichrome
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Water-soluble compounds move naturally in soil moisture toward roots of transpiring plants. To test for effects of rhizosphere food-web molecules on plants, low concentrations of common microbial products were supplied to bean (Phaseolus vulgaris L.) roots. Stomata] conductance and transpiration increased significantly (+20 to +30%, Pless than or equal to0.05) 42 h after 10 nM homoserine lactone (HL) was supplied to roots. Because transpiration helps both a plant and its root-colonizing bacteria obtain diffusion-limited mineral nutrients, such as phosphorus, any increase triggered by a degradation product of N-acyl-homoserine lactone (AHL) regulatory signals commonly used among plant-associated bacteria may represent a mutualistic plant-microbe interaction. Results from these initial physiological tests justify further screening to identify other rhizosphere compounds that control plant functions important for root-colonizing microorganisms. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
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