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The effect of plant growth-promoting rhizobacteria on asparagus seedlings and germinating seeds subjected to water stress under greenhouse conditions

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Plant growth-promoting rhizobacteria (PGPR) can have positive effects on vigour and productivity, especially under stress conditions. In asparagus (Asparagus officinalis L.) field culture, seeds are planted in high-density nurseries, and 1-year-old crowns are transplanted to production fields. Performance can be negatively affected by water stress, transplant shock, and disease pressure on wounded roots. PGPR inoculation has the potential to alleviate some of the stresses incurred in the production system. In this study, the effects of PGPR (Pseudomonas spp.) treatment were determined on 3-week-old greenhouse-grown seedlings and germinating seeds of 2 asparagus cultivars. The pots were irrigated to a predetermined level that resulted in optimum growth or the plants were subjected to drought or flooding stress for 8 weeks. The cultivars responded differently to PGPR: single inoculations of seedlings enhanced growth of ‘Guelph Millennium’ under optimum conditions and ‘Jersey Giant’ seedlings under drought stress. Seed inoculations with PGPR resulted in a positive response only for ‘Guelph Millennium’, for which both single or multiple inoculations enhanced plant growth under drought stress.

Les rhizobactéries qui favorisent la croissance des plantes (PGPR, acronyme de plant growth promoting rhizobacteria) peuvent avoir un effet positif sur la vigueur et la productivité des cultures, particulièrement lorsqu’elles sont soumises à un stress. Dans la culture des asperges (Asparagus officinalis L.), les graines sont d’abord semées à haute densité en pépinière, et les couronnes d’un an sont ensuite transplantées dans les champs de production. Le rendement peut être affecté de façon négative par le stress hydrique, par le choc de la transplantation et par la pression de maladies sur les racines endommagées. L’inoculation de PGPR peut atténuer les effets de certains éléments de stress inhérents au système de production. Dans cette étude, les effets d’un traitement aux PGPR (Pseudomonas spp.) ont été déterminés sur des semis en serre de 3 semaines et sur des graines en germination de deux cultivars d’asperge dont les pots ont été soit irrigués à un niveau prédéfini pour assurer une croissance optimale, soit soumis à la sécheresse ou submergés pendant huit semaines. Les cultivars répondaient différemment aux PGPR : une inoculation unique des semis augmentait la croissance du cv. ‘Guelph Millenium’ placé en conditions optimales et du cv. ‘Jersey Giant’ soumis à la sécheresse. L’inoculation des graines avec les PGPR menait à une réponse positive chez le ‘Guelph Millenium’ seulement; les inoculations uniques ou répétées augmentaient la croissance des plants soumis à la sécheresse.

Document Type: Research Article

Publication date: 2009-04-01

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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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