Cell-free culture medium of Burkholderia cepacia improves seed germination and seedling growth in maize (Zea mays) and rice (Oryza sativa)

The saprophytic bacterium Burkholderia cepacia has been shown to play an active role as plant growth promoting bacteria (PGPB). In this study, the ability of cell-free culture medium (CFCM) of B. cepacia to improve early developmental stages of plants has been assessed on two agronomically important...

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Bibliographic Details
Published in:Plant growth regulation 2010-04, Vol.60 (3), p.191-197
Main Authors: Hernández-Rodríguez, Annia, Heydrich-Pérez, Mayra, Diallo, Billo, El Jaziri, Mondher, Vandeputte, Olivier M
Format: Article
Language:English
Subjects:
Acetic acid
Agriculture
Biomedical and Life Sciences
Burkholderia cepacia
Cereal crops
Corn
Developmental stages
Fractionation
Life Sciences
Metabolites
Original Paper
Oryza sativa
Phenols
Plant Anatomy/Development
Plant growth
Plant Physiology
Plant Sciences
Roots
Seed germination
Seedlings
Zea mays
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Summary:The saprophytic bacterium Burkholderia cepacia has been shown to play an active role as plant growth promoting bacteria (PGPB). In this study, the ability of cell-free culture medium (CFCM) of B. cepacia to improve early developmental stages of plants has been assessed on two agronomically important crops, maize (Zea mays) and rice (Oryza sativa). Treating maize and rice seeds for 45 min before germination significantly improved seed germination and consequent seedling growth. The effect of CFCM was confirmed by the increased biomass of the shoot and, mainly, the root systems of treated seedlings. Chromatographic characterization of the CFCM revealed that the spent culture medium of B. cepacia is a complex mix of different classes of metabolites including, among others, salicylic acid, indole-3-acetic acid (IAA) and several unidentified phenolic compounds. Fractionation of the CFCM components revealed that the impressive development of the root system of CFCM-treated seedlings is due to the synergistic action of several groups of components rather than IAA alone. The data presented here suggest that a CFCM of B. cepacia can be used to improve crop germination.
ISSN:0167-6903
1573-5087
DOI:10.1007/s10725-009-9433-5