Liddycoat Scott M, Greenberg Bruce M, Wolyn David J
Department of Plant Agriculture, Bovey Building, University of Guelph, Guelph, ON N1G 2W1, Canada.
Can J Microbiol. 2009 Apr;55(4):388-94. doi: 10.1139/w08-144.
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.
植物促生根际细菌（PGPR）对植物活力和生产力具有积极影响，尤其是在胁迫条件下。在芦笋（Asparagus officinalis L.）田间种植中，种子种植于高密度苗圃，一年生根茎被移植到生产田。水分胁迫、移植应激以及受伤根系上的病害压力可能会对芦笋的生长表现产生负面影响。接种PGPR有潜力缓解生产系统中所遭遇的一些胁迫。在本研究中，测定了PGPR（假单胞菌属）处理对两个芦笋品种3周龄温室培育幼苗和萌发种子的影响。花盆被灌溉至预定水平以实现最佳生长，或者使植株遭受干旱或洪涝胁迫8周。两个品种对PGPR的反应不同：在最佳条件下，单独接种幼苗可促进‘圭尔夫千禧’的生长，在干旱胁迫下可促进‘泽西巨人’幼苗的生长。用PGPR接种种子仅对‘圭尔夫千禧’产生了积极反应，对于该品种，单独或多次接种均可在干旱胁迫下促进植株生长。
