Strategies to Maintain Natural Biocontrol of Soil-Borne Crop Diseases During Severe Drought and Rainfall Events

Meisner, Annelein; Boer, Wietse de

doi:10.3389/fmicb.2018.02279

Cited by 26 publications

(19 citation statements)

References 93 publications

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“…Although the impact of precipitation on fruit and vegetable crop microbiomes has not been directly investigated, it has long been understood that increased plant disease and food safety risks can succeed rain events by enhanced dissemination of pathogens, splash or flooding and by provision of more favourable growth conditions 10,20 . Shifts in precipitation and periods of drought could also affect biocontrol microorganisms, altering the suppressive potential of microbiomes 39 . Reaching a more nuanced understanding of the precise effect of precipitation on crop microbiomes and the microbial dynamics that ensue is valuable to the application of systems thinking and approaches to crop protection, especially when confronted with climate change and increasing severity and duration of rainfall and drought periods.…”

Section: Discussionmentioning

confidence: 99%

Rain induces temporary shifts in epiphytic bacterial communities of cucumber and tomato fruit

Allard

Ottesen

Micallef

2020

Sci Rep

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Understanding weather-related drivers of crop plant-microbiome relationships is important for food security and food safety in the face of a changing climate. cucumber and tomato are commercially important commodities that are susceptible to plant disease and have been implicated in foodborne disease outbreaks. To investigate the influence of precipitation on plant-associated microbiomes, epiphytically associated bacterial communities of cucumber and tomato samples were profiled by 16 S rRNA gene sequencing (V1-V3) in the days surrounding two rain events over a 17-day period. Following rain, α (within-sample) diversity measured on cucumber and tomato fruit surfaces, but not tomato leaf surfaces, increased significantly and remained elevated for several days. Bacterial β (between-sample) diversity on cucumber and tomato fruit responded to precipitation. In the cucumber fruit surface (carpoplane), notable shifts in the families Xanthomonadaceae, Oxalobacteriaceae, Sphingobacteriaceae and comamonadaceae were detected following precipitation. in the tomato carpoplane, shifts were detected in the families Enterobacteriaceae and Xanthomonadaceae following the first rain event, and in the Pseudomonadaceae and Oxalobacteriaceae following the second rain event. Few taxonomic shifts were detected in the tomato leaf surface (phylloplane). Exploring raininduced shifts in plant microbiomes is highly relevant to crop protection, food safety and agroecology, and can aid in devising ways to enhance crop resilience to stresses and climate fluctuations. Fruits and vegetables host distinct bacterial assemblages on various plant organs 1-3. Plant microbiomes are dynamic and undergo successional changes with plant development 4 , possibly with new introductions occurring throughout the plant life cycle. Several bacterial reservoirs for the phyllosphere microbiome have been reported, including the air 5 , insect pollinators 6 , seed 7 , other nearby plants 5 , and meteorological conditions 8. The impact of the latter on fresh produce crop microbiomes is of particular interest due to the highly variable nature of weather-related events, variation due to geography, and anticipated changes in precipitation patterns in the coming years due to climate change 9. Increased precipitation and humidity often favor the development of plant disease 10,11. Similarly, the prevalence of several foodborne pathogens including pathogenic Escherichia coli, Campylobacter jejuni, Salmonella enterica and Bacillus cereus has been correlated with elevated environmental temperature and humidity 12,13. In trials assessing the fate of E coli, fecal coliforms and enterococci applied to the lettuce phyllosphere, bacterial decline rates were slower under moderate and regular rain patterns 14. At the community level, rainfall events may coincide with drastic changes in the leaf surface microbiomes of canola plants, although changes due to plant development could be difficult to detangle 15. Below ground, some soil microbial communities are influenced by drying and ...

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Section: Discussionmentioning

confidence: 99%

Rain induces temporary shifts in epiphytic bacterial communities of cucumber and tomato fruit

Allard

Ottesen

Micallef

2020

Sci Rep

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“…Similarly, plant cues via root exudation that stimulate microbial release of nutrients for plant regrowth after drought might either not happen or not play a role in nutrient-rich agricultural soils, where sufficient nutrients are available for plant (re)growth. Furthermore, nutrient-rich soils might increase the vulnerability of drought-stressed plants to pathogens that increase under drought (49), might select for inherently drought-sensitive plants and microbiomes (50,51) and reduce the benefits and root colonisation of AMF (52). Much of our understanding of plant-microbial interactions under drought comes from non-crop species (Fig.…”

Section: Dickeya Dadantii; 47)mentioning

confidence: 99%

Harnessing rhizosphere microbiomes for drought-resilient crop production

Vries

Griffiths

Knight

et al. 2020

Science

590

372

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Root-associated microbes can improve plant growth, and they offer the potential to increase crop resilience to future drought. Although our understanding of the complex feedbacks between plant and microbial responses to drought is advancing, most of our knowledge comes from non-crop plants in controlled experiments. We propose that future research efforts should attempt to quantify relationships between plant and microbial traits, explicitly focus on food crops, and include longer-term experiments under field conditions. Overall, we highlight the need for improved mechanistic understanding of the complex feedbacks between plants and microbes during, and particularly after, drought. This requires integrating ecology with plant, microbiome, and molecular approaches and is central to making crop production more resilient to our future climate.

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“…However, the disease incidence was much higher in monoculture than intercropping, implying that intercropping has much stronger tolerance to unfavorable rainfall. Some studies have demonstrated that unusual climate changes such as severe drought and rainfall damage the natural capacity of soil microbes to suppress soil-borne plant pathogens, contributing to increased disease outbreaks [62].…”

Section: Pcr Amplification and Phylogenetic Analysismentioning

confidence: 99%

Maize/Soybean Relay Strip Intercropping Reduces the Occurrence of Fusarium Root Rot and Changes the Diversity of the Pathogenic Fusarium Species

Chang

Naeem

et al. 2020

Pathogens

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Fusarium species are the most detrimental pathogens of soybean root rot worldwide, causing large loss in soybean production. Maize/soybean relay strip intercropping has significant advantages on the increase of crop yields and efficient use of agricultural resources, but its effects on the occurrence and pathogen population of soybean root rot are rarely known. In this study, root rot was investigated in the fields of the continuous maize/soybean strip relay intercropping and soybean monoculture. Fusarium species were isolated from diseased soybean roots and identified based on sequence analysis of translation elongation factor 1α (EF-1α) and RNA polymerase II second largest subunit (RPB2), and the diversity and pathogenicity of these species were also analyzed. Our results showed that intercropping significantly decreased soybean root rot over monoculture. A more diverse Fusarium population including Fusarium solani species complex (FSSC), F. incarnatum-equiseti species complex (FIESC), F. oxysporum, F. fujikuroi, F. proliferatum and F. verticillioides, F. graminearum and F. asiaticum was identified from intercropping while FSSC, FIESC, F. oxysporum, F. commune, F. asiaticum and F. meridionale were found from monoculture. All Fusarium species caused soybean root infection but exhibited distinct aggressiveness. The most aggressive F. oxysporum was more frequently isolated in monoculture than intercropping. FSSC and FIESC were the dominant species complex and differed in their aggressiveness. Additionally, F. fujikuroi, F. proliferatum and F. verticillioides were specifically identified from intercropping with weak or middle aggressiveness. Except for F. graminearum, F. meridionale and F. asiaticum were firstly reported to cause soybean root rot in China. This study indicates maize/soybean relay strip intercropping can reduce soybean root rot, change the diversity and aggressiveness of Fusarium species, which provides an important reference for effective management of this disease.

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Strategies to Maintain Natural Biocontrol of Soil-Borne Crop Diseases During Severe Drought and Rainfall Events

Cited by 26 publications

References 93 publications

Rain induces temporary shifts in epiphytic bacterial communities of cucumber and tomato fruit

Rain induces temporary shifts in epiphytic bacterial communities of cucumber and tomato fruit

Harnessing rhizosphere microbiomes for drought-resilient crop production

Maize/Soybean Relay Strip Intercropping Reduces the Occurrence of Fusarium Root Rot and Changes the Diversity of the Pathogenic Fusarium Species

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