Plant growth-promoting rhizobacteria modulate root-system architecture in <Emphasis Type="Italic">Arabidopsis thaliana</Emphasis> through volatile organic compound emission |
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Authors: | Francisca M Gutiérrez-Luna José López-Bucio Josué Altamirano-Hernández Eduardo Valencia-Cantero Homero Reyes de la Cruz Lourdes Macías-Rodríguez |
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Institution: | 1.Instituto de Investigaciones Químico Biológicas,Universidad Michoacana de San Nicolás de Hidalgo,Morelia,México |
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Abstract: | Extensive communication occurs between plants and microorganisms during different stages of plant development in which signaling
molecules from the two partners play an important role. Volatile organic compounds (VOCs) emission by certain plant-growth
promoting rhizobacteria (PGPR) has been found to be involved in plant growth. However, little is known about the role of bacterial
VOCs in plant developmental processes. In this work, we investigated the effects of inoculation with twelve bacterial strains
isolated from the rhizosphere of lemon plants (Citrus aurantifolia) on growth and development of Arabidopsis thaliana seedlings. Several bacterial strains showed a plant growth promoting effect stimulating biomass production, which was related
to differential modulation of root-system architecture. The isolates L263, L266, and L272a stimulated primary root growth
and lateral root development, while L254, L265a and L265b did not significantly alter primary root growth but strongly promoted
lateral root formation. VOC emission analysis by SPME-GC-MS identified aldehydes, ketones and alcohols as the most abundant
compounds common to most rhizobacteria. Other VOCs, including 1-octen-3-ol and butyrolactone were strain specific. Characterization
of L254, L266 and L272a bacterial isolates by 16S rDNA analysis revealed the identity of these strains as Bacillus cereus, Bacillus simplex and Bacillus sp, respectively. Taken together, our data suggest that rhizospheric bacterial strains can modulate both plant growth promotion
and root-system architecture by differential VOC emission. |
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