Endophytic colonization and biocontrol performance of <scp>P</scp>seudomonas fluorescens <scp>PICF</scp>7 in olive (<scp>O</scp>lea europaea L.) are determined neither by pyoverdine production nor swimming motility

Maldonado-González, María Mercedes; Schilirò, Elisabetta; Prieto, Pilar; Mercado‐Blanco, Jesús

doi:10.1111/1462-2920.12725

Cited by 44 publications

(48 citation statements)

References 83 publications

(127 reference statements)

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“…The in vitro production of siderophores was shown for a number of BCAs with antagonistic effect on Verticillium (Berg et al, 1996, 2000; Mercado-Blanco et al, 2004; Li et al, 2010; Xue et al, 2013). However, Maldonado-González et al (2015a,b) showed that siderophore production is not required for biological control of Verticillium wilt by Pseudomonas fluorescens PICF7.…”

Section: Biological Control Of Verticillium Wiltmentioning

confidence: 99%

Desirable Traits of a Good Biocontrol Agent against Verticillium Wilt

et al. 2017

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The soil-borne fungus Verticillium causes serious vascular disease in a wide variety of annual crops and woody perennials. Verticillium wilt is notoriously difficult to control by conventional methods, so there is great potential for biocontrol to manage this disease. In this study we aimed to review the research about Verticillium biocontrol to get a better understanding of characteristics that are desirable in a biocontrol agent (BCA) against Verticillium wilt. We only considered studies in which the BCAs were tested on plants. Most biocontrol studies were focused on plants of the Solanaceae, Malvaceae, and Brassicaceae and within these families eggplant, cotton, and oilseed rape were the most studied crops. The list of bacterial BCAs with potential against Verticillium was dominated by endophytic Bacillus and Pseudomonas isolates, while non-pathogenic xylem-colonizing Verticillium and Fusarium isolates topped the fungal list. Predominant modes of action involved in biocontrol were inhibition of primary inoculum germination, plant growth promotion, competition and induced resistance. Many BCAs showed in vitro antibiosis and mycoparasitism but these traits were not correlated with activity in vivo and there is no evidence that they play a role in planta. Good BCAs were obtained from soils suppressive to Verticillium wilt, disease suppressive composts, and healthy plants in infested fields. Desirable characteristics in a BCA against Verticillium are the ability to (1) affect the survival or germination of microsclerotia, (2) colonize the xylem and/or cortex and compete with the pathogen for nutrients and/or space, (3) induce resistance responses in the plant and/or (4) promote plant growth. Potential BCAs should be screened in conditions that resemble the field situation to increase the chance of successful use in practice. Furthermore, issues such as large scale production, formulation, preservation conditions, shelf life, and application methods should be considered early in the process of selecting BCAs against Verticillium.

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Section: Biological Control Of Verticillium Wiltmentioning

confidence: 99%

Desirable Traits of a Good Biocontrol Agent against Verticillium Wilt

et al. 2017

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“…Moreover, bacterial antagonists of olive phytopathogens isolated from the olive root endosphere or the rhizosphere have the advantage to be adapted to the ecological niche where they can potentially exert their beneficial effect 18 . For instance, Proteobacteria and Firmicutes representatives, usually found as natural inhabitants from the olive rhizosphere, are thus good examples of effective antagonists against V. dahliae 16–18,29 . Besides, representatives of these phyla such as the genera Pseudomonas and Bacillus are easy to isolate, manipulate, propagate and formulate as BCAs.…”

Section: Discussionmentioning

confidence: 99%

Defining the root endosphere and rhizosphere microbiomes from the World Olive Germplasm Collection

Fernández-González¹,

Villadas²,

Cabanás

et al. 2019

Preprint

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Up to date, the bacterial and fungal microbial communities from the olive (Olea europaea L.) root systems have not been simultaneously studied. In this work, we show that microbial communities from the olive root endosphere are less diverse than those from the rhizosphere. But more relevant was to unveil that olive belowground communities are mainly shaped by the genotype of the cultivar when growing under the same environmental, pedological and agronomic conditions. Furthermore, Actinophytocola, Streptomyces and Pseudonocardia are the most abundant bacterial genera in the olive root endosphere, Actinophytocola being the most prevalent genus by far. In contrast, Gp6, Gp4, Rhizobium and Sphingomonas are the main genera in the olive rhizosphere. Canalisporium, Aspergillus, Minimelanolocus and Macrophomina are the main fungal genera present in the olive root system. Interestingly enough, a high proportion of so far unclassified fungal sequences at class level were detected in the rhizosphere. From the belowground microbial profiles here reported, it can be concluded that the genus Actinophytocola may play an important role in olive adaptation to environmental stresses. Moreover, the huge unknown fungal diversity suggests that there are still some fungi with important ecological and biotechnological implications that have yet to be discovered.

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“…Czaban et al (2007) conferred that the flagellar motility is an important feature in the bacterial colonization (especially the root interiors) based on the observation that revealed greater proportion of motile strains in endosphere than the rhizoplane and rhizosphere. However, Maldonado-González et al (2015) observed that there was no difference in endophytic colonization of P. fluorescens PICF7 in olive on mutation in flil gene required for the swimming motility. This observation indicates different mode of colonization required by various endophytes.…”

Section: Chemotactic Migration Towards Rootsmentioning

confidence: 91%

“…However, it is exclusively strain dependent as the O-antigenic side chain of P. fluorescens WCS374 does help in potato root adhesion, whereas the chemical components of O-antigen chain of P. fluorescens PCL1205 contributed in tomato root colonization (Berendsen et al 2015). However, Maldonado-González et al (2015) conducted a ground breaking study to investigate the role of swimming motility, siderophore pyoverdine production, cysteine auxotrophy on olive root colonization and biocontrol activity of P. fluorescence PICF7. It is an indigenous strain that colonizes root tissues of olive and imparts effective biocontrol against Verticilium dahliae, a causative agent of verticilium wilt in olive.…”

Section: Quorum Sensing: Cell Density Dependent Colonizationmentioning

confidence: 99%

Mechanistic insights on plant root colonization by bacterial endophytes: a symbiotic relationship for sustainable agriculture

Jha

Panwar

2018

Environmental Sustainability

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Plant-microbe and soil interactions are one of the oldest muse for multi-disciplinary researchers. Plant growth promoting microorganisms influence the host physiology by secreting regulatory chemical signals in the vicinity of plant roots and play a key role in the enhancement of plant growth and expansion. The present review deals with the in-depth understanding of steps involved in host tissues colonization by bacterial endophytes. The molecular insights of these events, particularly for endophytic bacteria, are poorly documented till date. The endophytic bacteria must coexist with the host plant and capable of colonizing the internal plant tissues without being recognized as a pathogen. A proper understanding of exchange of signals between the host plant and bacterial communities is required which may facilitate the development of new strategies to promote beneficial interactions between them. This knowledge can be instrumental in agricultural practices as well as for phytoremediation of pollutants. Keeping these facts in mind, the present review attempts to explore the systematic understanding of steps involved and molecular insights of plant colonization events by endophytic bacteria. We conclude that molecular mechanisms and factors affecting endophytic bacterial colonization deserve more research attention in order to exploit their beneficial aspects for sustainable agriculture and environment.

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Endophytic colonization and biocontrol performance of Pseudomonas fluorescens PICF7 in olive (Olea europaea L.) are determined neither by pyoverdine production nor swimming motility

Cited by 44 publications

References 83 publications

Desirable Traits of a Good Biocontrol Agent against Verticillium Wilt

Desirable Traits of a Good Biocontrol Agent against Verticillium Wilt

Defining the root endosphere and rhizosphere microbiomes from the World Olive Germplasm Collection

Mechanistic insights on plant root colonization by bacterial endophytes: a symbiotic relationship for sustainable agriculture

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