Arthrobacter agilis UMCV2 induces iron acquisition in Medicago truncatula (strategy I plant) in vitro via dimethylhexadecylamine emission

Background and aims Iron is an essential nutrient for plant growth. Although abundant in soil, iron is poorly available. Therefore, plants have evolved mechanisms for iron mobilization and uptake from the rhizospheric environment. In this study, we examined the physiological responses to iron defici...

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Published in:Plant and soil 2013-01, Vol.362 (1/2), p.51-66
Main Authors: del Carmen Orozco-Mosqueda, Ma, Velázquez-Becerra, Crisanto, Macías-Rodríguez, Lourdes I., Santoyo, Gustavo, Flores-Cortez, Idolina, Alfaro-Cuevas, Ruth, Valencia-Cantero, Eduardo
Format: Article
Language:English
Subjects:
Acid soils
Acidification
Agronomy. Soil science and plant productions
Animal, plant and microbial ecology
Arthrobacter agilis
Bacteria
Biochemistry
Biological and medical sciences
Biomedical and Life Sciences
Chlorophylls
Ecology
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Iron
Life Sciences
Medicago truncatula
Plant biology
Plant growth
Plant Physiology
Plant populations
Plant roots
Plant Sciences
Plants
Regular Article
Rhizosphere
Soil biochemistry
Soil microorganisms
Soil Science & Conservation
Soil sciences
Soil-plant relationships. Soil fertility
Soil-plant relationships. Soil fertility. Fertilization. Amendments
Volatile organic compounds
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Summary:Background and aims Iron is an essential nutrient for plant growth. Although abundant in soil, iron is poorly available. Therefore, plants have evolved mechanisms for iron mobilization and uptake from the rhizospheric environment. In this study, we examined the physiological responses to iron deficiency in Medicago truncatula plants exposed to volatile organic compounds (VOCs) produced by Arthrobacter agilis UMCV2. Methods The VOC profiles of the plant and bacterium were determined separately and during interaction assays using gas chromatography. M. truncatula plants exposed to A. agilis VOCs and pure dimethylhexadecylamine were transferred to conditions of iron deficiency, and parameters associated with iron nutritional status were measured. Results The relative abundance of the bacterial VOC dimethylhexadecylamine increased 12-fold when in co-cultures of A. agilis and M. truncatula, compared to axenic cultures. Plants exposed to bacterial VOCs or dimethylhexadecylamine exhibited a higher rhizosphere acidification capacity, enhanced ferric reductase activity, higher biomass generation, and elevated chlorophyll and iron content relative to controls. Conclusions The VOCs emitted by A. agilis UMCV2 induce iron acquisition mechanisms in vitro in the Strategy I plant M. truncatula. Dimethylhexadecylamine is the signal molecule responsible for producing the beneficial effects.
ISSN:0032-079X
1573-5036
DOI:10.1007/s11104-012-1263-y