Early stage effects of Verticillium wilt of olive (WVO) on nutrient use in young olive trees grown in soils amended with compost and mineral fertilisation

Romanyà, Joan; Sancho-Adamson, Marc; Ortega, Daniela; Trillas, M.I.

doi:10.1007/s11104-018-03923-9

Cited by 7 publications

(10 citation statements)

References 52 publications

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“…This hypothesis is further substantiated by generally higher values found in Soil-C2 compared with Soil-C1, considering Soil-C2 was more fertile (Table 1), results obtained for GA ( Figure 4) which highly correlate with plant biomass [45] inferring increased plant growth as a consequence of mineral fertilization and compost amendments along with decreased plant growth due to inoculation, as well as a reduction in the inoculation effect vector magnitude when comparing MF+ to MF-( Figure 5), with no important changes in vector direction observed between mineral fertilization scenarios or across sampling time points. These findings, showing a clear interaction between host infection and nutrition are in accordance with results obtained in an assay carried out during the previous year employing the same experimental design [41], which showed reductions in leaf growth as well as reduced leaf N, K and S inputs in inoculated plants. Reduced differences observed between control and inoculated plants in results obtained from RGB indexes can thus be attributed to improved nutrition conferred by both mineral and organic fertility, although suppressiveness as a consequence of microbial activity from compost amendments cannot be ruled out and calls for further study.…”

Section: Discussionsupporting

confidence: 91%

“…During the course of the experiment inoculated plants remained asymptomatic, presenting no evidence of wilt. We were however, able to positively re-isolate and identify Verticillium dahliae from branch segments obtained from inoculated plants and grown out in Petri dishes in Czapek-Dox agar medium [41]. Soil temperatures recorded at the time of sampling physiological parameters ( Figure 3) had a mean value of 22…”

Section: Resultsmentioning

confidence: 98%

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Use of RGB Vegetation Indexes in Assessing Early Effects of Verticillium Wilt of Olive in Asymptomatic Plants in High and Low Fertility Scenarios

et al. 2019

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Verticillium Wilt of Olive, a disease caused by the hemibiotrophic vascular fungus Verticillium dahliae Kleb. presents one of the most important constraints to olive production in the world, with an especially notable impact in Mediterranean agriculture. This study evaluates the use of RGB vegetation indexes in assessing the effects of this disease during the biotrophic phase of host-pathogen interaction, in which symptoms of wilt are not yet evident. While no differences were detected by measuring stomatal conductance and chlorophyll fluorescence, results obtained from RGB indexes showed significant differences between control and inoculated plants for indexes Saturation, a*, b*, green Area (GA), normalized green-red difference index (NGRDI) and triangular greenness index (TGI), presenting a reduction in plant growth as well as in green and yellow color components as an effect of inoculation. These results were contrasted across two scenarios of mineral fertilization in soil and soil amended with two different olive mill waste composts, presenting a clear interaction between the host-pathogen relationship and plant nutrition and suggesting the effect of V. dahliae infection during the biotrophic phase was not related to plant water status.

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Section: Discussionsupporting

confidence: 91%

Section: Resultsmentioning

confidence: 98%

Use of RGB Vegetation Indexes in Assessing Early Effects of Verticillium Wilt of Olive in Asymptomatic Plants in High and Low Fertility Scenarios

et al. 2019

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“…Organic C content was 0.86%, C/N ratio was 10.7, and pH was 8.58. For more details (see Romanyà et al, 2019). This soil was sieved through 0.5 cm mesh size, thoroughly homogenized, and mixed with Perlite (Premium Gramoflor from Germany, 2-6 mm) in order to improve aeration.…”

Section: Study Design and Samplingmentioning

confidence: 99%

“…The use of organic amendments affects the chemical and physical properties in soil and may affect soil biology and nutrient availability (Bulluck et al, 2002;Romanyà and Rovira, 2011;Romanyà et al, 2019). Organic amendments have been shown to enhance soil food webs by increasing soil microorganisms and reducing plant-parasitic organisms (Treonis et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Impact of Olive Saplings and Organic Amendments on Soil Microbial Communities and Effects of Mineral Fertilization

et al. 2021

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Plant communities and fertilization may have an impact on soil microbiome. Most commercial olive trees are minerally fertilized, while this practice is being replaced by the use of organic amendments. Organic amendments can both fertilize and promote plant growth-promoting organisms. Our aims were (i) to describe the changes in soil bacterial and fungal communities induced by the presence of young olive trees and their interaction with organic amendments and (ii) to compare the effects of mineral and organic fertilization. We set up two parallel experiments in pots using a previously homogenized soil collected from a commercial olive orchard: in the first one, we grew olive saplings in unamended and organically amended soils with two distinct composts and compared these two soils incubated without a plant, while in the second experiment, we comparatively tested the effects of organic and mineral fertilization. OTUs and the relative abundances of bacterial and fungal genera and phyla were analyzed by 16S rRNA and ITS1 gene amplicon using high-throughput sequencing. Basal respiration and substrate-induced respiration were measured by MicroRespTM. The effects of the different treatments were analyzed in all phyla and in the 100 most abundant genera. The presence of olive saplings increased substrate-induced respiration and bacterial and fungal richness and diversity. Organic amendments greatly affected both bacterial and fungal phyla and increased bacterial richness while not affecting fungal richness. Mineral fertilization increased the relative abundance of the less metabolically active bacterial phyla (Actinobacteria and Firmicutes), while it reduced the most metabolically active phylum, Bacteroidetes. Mineral fertilization increased the relative abundance of three N2-fixing Actinobacteria genera, while organic fertilization only increased one genus of Proteobacteria. In organically and minerally fertilized soils, high basal respiration rates were associated with low fungal diversity. Basidiomycota and Chytridiomycota relative abundances positively correlated with basal respiration and substrate-induced respiration, while Ascomycota correlated negatively. Indeed, the Ascomycota phyla comprised most of the fungal genera decreased by organic amendments. The symbiotrophic phylum Glomeromycota did not correlate with any of the C sources. The relative abundance of this phylum was promoted by the presence of plants but decreased when amending soils with composts.

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“…The inhibition of the pathogen's growth may be attributed to biocontrol exerted by specific components of the microbial communities present in the OM and/or that are stimulated upon the addition of the OM to the soil, by means of antibiosis, competition, or parasitism [150,151]. The different physical-chemical properties of OM, such as variations of pH; EC (dS/m); the concentration of K + , Ca + , PPO 4 3 , N-NO 3 -, and N-NH 4 + ; enzymatic diversity; β-glucosidase activity; oxygen uptake rate; or phosphatase activity may influence the effectiveness of OM treatments and may be used as predictors of the suppressive capacity of these composts against V. dahliae [147,152,153].…”

Section: Organic Amendments: a Second Life For Agricultural Waste To mentioning

confidence: 99%

Verticillium Wilt of Olive and Its Control: What Did We Learn during the Last Decade?

Montes-Osuna

Mercado‐Blanco

2020

Plants

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Verticillium (Verticillium dahliae Kleb.) wilt is one of the most devastating diseases affecting olive (Olea europaea L. subsp. europaea var. europaea) cultivation. Its effective control strongly relies on integrated management strategies. Olive cultivation systems are experiencing important changes (e.g., high-density orchards, etc.) aiming at improving productivity. The impact of these changes on soil biology and the incidence/severity of olive pests and diseases has not yet been sufficiently evaluated. A comprehensive understanding of the biology of the pathogen and its populations, the epidemiological factors contributing to exacerbating the disease, the underlying mechanisms of tolerance/resistance, and the involvement of the olive-associated microbiota in the tree’s health is needed. This knowledge will be instrumental to developing more effective control measures to confront the disease in regions where the pathogen is present, or to exclude it from V. dahliae-free areas. This review compiles the most recent advances achieved to understand the olive–V. dahliae interaction as well as measures to control the disease. Aspects such as the molecular basis of the host–pathogen interaction, the identification of new biocontrol agents, the implementation of “-omics” approaches to unravel the basis of disease tolerance, and the utilization of remote sensing technology for the early detection of pathogen attacks are highlighted.

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Early stage effects of Verticillium wilt of olive (WVO) on nutrient use in young olive trees grown in soils amended with compost and mineral fertilisation

Cited by 7 publications

References 52 publications

Use of RGB Vegetation Indexes in Assessing Early Effects of Verticillium Wilt of Olive in Asymptomatic Plants in High and Low Fertility Scenarios

Use of RGB Vegetation Indexes in Assessing Early Effects of Verticillium Wilt of Olive in Asymptomatic Plants in High and Low Fertility Scenarios

Impact of Olive Saplings and Organic Amendments on Soil Microbial Communities and Effects of Mineral Fertilization

Verticillium Wilt of Olive and Its Control: What Did We Learn during the Last Decade?

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