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Film coating of seeds with Bacillus cereus RS87 spores for early plant growth enhancement

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The plant growth-promoting rhizobacterium Bacillus cereus RS87 was previously reported to promote plant growth in various crops in both greenhouse and field trials. To apply as a plant growth promoting agent with practical use, it is essential to ease the burden of routine preparation of a fresh suspension of strain RS87 in laboratory. The objectives of this study were to investigate the feasibility of film-coating seeds with B. cereus RS87 spores for early plant growth enhancement and to reveal the indoleacetic acid (IAA) production released from strain RS87. The experiment consisted of the following 5 treatments: nontreated seeds, water-soaked seeds, film-coated seeds, seeds soaked with vegetative cells of strain RS87, and film-coated seeds with strain RS87 spores. Three experiments were conducted separately to assess seed emergence, root length, and plant height. Results showed that both vegetative cells and spores of strain RS87 significantly promoted (P ≤ 0.05) seed emergence, root length and plant height over the control treatments. The strain RS87 also produced IAA. In conclusion, the film coating of seeds with spores of B. cereus RS87 demonstrated early plant growth enhancement as well as seeds using their vegetative cells. IAA released from strain RS87 would be one of the mechanisms for plant growth enhancement.

La souche RS87 de Bacillus cereus, une rhizobactérie stimulant la croissance des plantes, a démontré sa capacité de promouvoir la croissance de différentes cultures lors d’essais en serre et sur le terrain. Afin de faciliter l’utilisation de cet agent de promotion de la croissance des plantes, il est nécessaire d’alléger le fardeau que constitue la préparation de routine de suspensions fraîches de la souche RS87 en laboratoire. Les objectifs de cette étude étaient d’évaluer la faisabilité d’un enrobage de graines par un film contenant des spores de la souche RS87 de B. cereus afin de stimuler la croissance précoce de plants et de mesurer la production d’AIA secrété par la souche RS87. L’expérience consistait en cinq traitements : graines non traitées, graines trempées dans l’eau, graines enrobées d’un film, graines imprégnées de cellules végétatives de la souche RS87 et graines enrobées d’un film contenant des spores de la souche RS87. Trois expériences ont été réalisées de façon indépendante afin d’évaluer l’émergence des graines, la longueur des racines et la hauteur des plants. Les résultats ont démontré que tant les cellules végétatives que les spores de la souche RS87 stimulaient significativement (P ≤ 0,05) l’émergence des graines, la longueur des racines et la hauteur des plants par rapport au groupe de contrôle non traité. La souche RS87 produisait aussi de l’AIA. En conclusion, l’enrobage de graines par un film contenant des spores de la souche RS87 de B. cereus a stimulé la croissance précoce des plants et des graines par l’intermédiaire des cellules végétatives. L’AIA secrété par la souche RS87 pourrait être l’un des mécanismes responsables de l’augmentation de la croissance des plants.

Document Type: Research Article

Publication date: October 1, 2008

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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