Plant genotype and seasonality drive fine changes in olive root microbiota

Chialva, Matteo; Rose, Silvia De; Novero, Mara; Lanfranco, Luisa; Bonfante, Paola

doi:10.1016/j.cpb.2021.100219

Cited by 18 publications

(13 citation statements)

References 77 publications

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“…These two genera were often observed in olive phyllosphere (Müller et al, 2015;Mina et al, 2020) and it should be noted that Pseudomonas, Ralstonia and Pelomonas are known to represent three main genera of the olive phyllosphere core microbiome in European cultivars (Müller et al, 2015). Intriguingly, it has been previously observed that olive root bacterial communities appeared stable in taxa composition across genotypes and seasons (Chialva et al, 2021). However, Mina and colleagues (2020) observed significant differences between microbial composition of phyllosphere of two Spanish olive cultivars grow in orchards (Mina et al, 2020).…”

Section: B a Figurementioning

confidence: 92%

“…Regarding the endophytic/epiphytic composition in the olive trees, recent studies have shown that differences emerge when different cultivars ( Mina et al., 2020 ) and diverse European origin areas ( Müller et al., 2015 ) are taken into account, or the microbiome profile of plant tissues is comparatively evaluated ( Malacrinò et al., 2022 ). The microbiota of olive roots across different seasonal patterns was also elucidated ( Chialva et al., 2021 ). Thus, understanding the complex mechanisms of woody plants, including important crop species such as olive tree, and their relationship with endophytic microorganisms could open new avenues for alternative ecological strategies to grow plants in soils affected by high salt concentrations.…”

Section: Introductionmentioning

confidence: 99%

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Salt stress in olive tree shapes resident endophytic microbiota

Vita

Sabbatini²,

Sillo³

et al. 2022

Front. Plant Sci.

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Olea europaea L. is a glycophyte representing one of the most important plants in the Mediterranean area, both from an economic and agricultural point of view. Its adaptability to different environmental conditions enables its cultivation in numerous agricultural scenarios, even on marginal areas, characterized by soils unsuitable for other crops. Salt stress represents one current major threats to crop production, including olive tree. In order to overcome this constraint, several cultivars have been evaluated over the years using biochemical and physiological methods to select the most suitable ones for cultivation in harsh environments. Thus the development of novel methodologies have provided useful tools for evaluating the adaptive capacity of cultivars, among which the evaluation of the plant-microbiota ratio, which is important for the maintenance of plant homeostasis. In the present study, four olive tree cultivars (two traditional and two for intensive cultivation) were subjected to saline stress using two concentrations of salt, 100 mM and 200 mM. The effects of stress on diverse cultivars were assessed by using biochemical analyses (i.e., proline, carotenoid and chlorophyll content), showing a cultivar-dependent response. Additionally, the olive tree response to stress was correlated with the leaf endophytic bacterial community. Results of the metabarcoding analyses showed a significant shift in the resident microbiome for plants subjected to moderate salt stress, which did not occur under extreme salt-stress conditions. In the whole, these results showed that the integration of stress markers and endophytic community represents a suitable approach to evaluate the adaptation of cultivars to environmental stresses.

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Section: B a Figurementioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Salt stress in olive tree shapes resident endophytic microbiota

Vita

Sabbatini²,

Sillo³

et al. 2022

Front. Plant Sci.

View full text Add to dashboard Cite

show abstract

“…Such a turnover in microbiota could assist plants in preparing for sub-zero temperature conditions and their vulnerability to psychrophilic pathogens. Indeed, winter seasonality in the plant microbiome has been previously reported [3][4][5]. Although the impact of cold acclimation on the microbiomes of perennial grass has not been hitherto explored, the identification of their bacterial and fungal communities offers the promise of understanding how the battle against coming winter conditions can be won by partnerships.…”

Section: Introductionmentioning

confidence: 99%

“…The general beneficial effects of microbes on plant fitness under a variety of stressful conditions have recently come to be known as the "Defence Biome" [5,[10][11][12][13][14][15][16][17]. Symbiontmediated fitness benefits may be a collective result of microbial exudates and function, for example, by facilitating early stress sensing and more efficient nutrient uptake and transfer, as well as by the induction of plant stress genes [9,10].…”

Section: Introductionmentioning

confidence: 99%

Cold Acclimation in Brachypodium Is Accompanied by Changes in Above-Ground Bacterial and Fungal Communities

Juurakko

diCenzo

Walker

2021

Plants

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Shifts in microbiota undoubtedly support host plants faced with abiotic stress, including low temperatures. Cold-resistant perennials prepare for freeze stress during a period of cold acclimation that can be mimicked by transfer from growing conditions to a reduced photoperiod and a temperature of 4 °C for 2–6 days. After cold acclimation, the model cereal, Brachypodium distachyon, was characterized using metagenomics supplemented with amplicon sequencing (16S ribosomal RNA gene fragments and an internal transcribed spacer region). The bacterial and fungal rhizosphere remained largely unchanged from that of non-acclimated plants. However, leaf samples representing bacterial and fungal communities of the endo- and phyllospheres significantly changed. For example, a plant-beneficial bacterium, Streptomyces sp. M2, increased more than 200-fold in relative abundance in cold-acclimated leaves, and this increase correlated with a striking decrease in the abundance of Pseudomonas syringae (from 8% to zero). This change is of consequence to the host, since P. syringae is a ubiquitous ice-nucleating phytopathogen responsible for devastating frost events in crops. We posit that a responsive above-ground bacterial and fungal community interacts with Brachypodium’s low temperature and anti-pathogen signalling networks to help ensure survival in subsequent freeze events, underscoring the importance of inter-kingdom partnerships in the response to cold stress.

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“…Chilling and frost stress during winter and spring in China restrict olive growth and threaten its normal physiological function. Surprisingly, olive trees cultivated under cold climates produce unexpected benefits, as cold improves olive fruit quality by slowing down the post-maturation process ( Chialva et al., 2021 ). Therefore, it is important to breed and domesticate cold-resistant olive varieties.…”

Section: Introductionmentioning

confidence: 99%

Alterations of phenotype, physiology, and functional substances reveal the chilling-tolerant mechanism in two common Olea Europaea cultivars

Jiang

et al. 2023

Front. Plant Sci.

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Olive suffers from cold damage when introduced to high-latitude regions from its native warm climes. Therefore, this study aims to improve the adaption of olive to climates in which it is cold for part of the year. The phenotype, physiological performance, nutrient content, and gene expression of olive leaves (from two widely planted cultivars) were examined after cultivation in normal and cold stress conditions. The results showed that the cold-tolerant cultivar possessed stronger photosynthesis efficiency and higher anti-oxidase activity after cold treatment than the cold-sensitive cultivar. Alteration of gene expression and metabolites in the amino acid metabolism, glycerolipid metabolism, diterpenoid biosynthesis, and oleuropein metabolism pathways played an important role in the cold responses of olive. Furthermore, the construction of the network of genes for ubiquitination and metabolites suggested that polyubiquitination contributes most to the stable physiology of olive under cold stress. Altogether, the results of this study can play an important role in helping us to understand the cold hardiness of olive and screen cold-resistant varieties for excellent quality and yield.

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Plant genotype and seasonality drive fine changes in olive root microbiota

Cited by 18 publications

References 77 publications

Salt stress in olive tree shapes resident endophytic microbiota

Salt stress in olive tree shapes resident endophytic microbiota

Cold Acclimation in Brachypodium Is Accompanied by Changes in Above-Ground Bacterial and Fungal Communities

Alterations of phenotype, physiology, and functional substances reveal the chilling-tolerant mechanism in two common Olea Europaea cultivars

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