Pre-sowing recurrent inoculation with Pseudomonas fluorescens promotes maize growth

IF 5.1 1区 农林科学 Q1 SOIL SCIENCE
Marine Papin, Amélie Polrot, Marie-Christine Breuil, Sonia Czarnes, Assia Dreux-Zigha, Xavier Le Roux, Ahmed Taibi, Aymé Spor, Laurent Philippot
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Abstract

Despite the rapid development of microbial inoculants use, their effectiveness still lacks robustness, partly due to our limited understanding of the factors influencing their establishment in soil. Recurrent inoculation can temporarily increase their abundance, but the effect of this inoculation strategy on plant growth and on the resident microbial community is still poorly studied. Here, we investigated maize growth and soil bacterial community responses under recurrent inoculation of the plant-beneficial bacterium Pseudomonas fluorescens B177. We further assessed how the effect of recurrent inoculation was modulated by the inoculant dose, the application timing and the soil type. Recurrent inoculation at high dose transiently increased the abundance of P. fluorescens B177 and resulted in larger shifts in the resident bacterial community compared to a single inoculation event. Moreover, recurrent inoculation prior to sowing had the strongest effect on maize growth, with increased shoot dry weight by 47.4%, likely due to an indirect effect of the inoculant through early changes in the resident community. Altogether these findings highlight the significance of recurrent pre-sowing inoculations as an alternative strategy for promoting plant growth.

Abstract Image

播种前反复接种荧光假单胞菌可促进玉米生长
尽管微生物接种剂的使用发展迅速,但其有效性仍然不够强大,部分原因是我们对影响微生物在土壤中建立的因素了解有限。重复接种可以暂时提高它们的丰度,但这种接种策略对植物生长和常驻微生物群落的影响还没有得到充分研究。在此,我们研究了在重复接种对植物有益的荧光假单胞菌 B177 的情况下玉米的生长和土壤细菌群落的反应。我们进一步评估了接种剂剂量、施用时间和土壤类型对重复接种效果的影响。与单次接种相比,高剂量重复接种可短暂提高荧光假单胞菌 B177 的丰度,并导致常驻细菌群落发生更大的变化。此外,播种前的重复接种对玉米生长的影响最大,芽干重增加了 47.4%,这可能是由于接种剂通过驻留群落的早期变化产生了间接影响。总之,这些发现凸显了播种前重复接种作为促进植物生长的替代策略的重要性。
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来源期刊
Biology and Fertility of Soils
Biology and Fertility of Soils 农林科学-土壤科学
CiteScore
11.80
自引率
10.80%
发文量
62
审稿时长
2.2 months
期刊介绍: Biology and Fertility of Soils publishes in English original papers, reviews and short communications on all fundamental and applied aspects of biology – microflora and microfauna - and fertility of soils. It offers a forum for research aimed at broadening the understanding of biological functions, processes and interactions in soils, particularly concerning the increasing demands of agriculture, deforestation and industrialization. The journal includes articles on techniques and methods that evaluate processes, biogeochemical interactions and ecological stresses, and sometimes presents special issues on relevant topics.
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