Salt Stress Mitigating Potential of Halotolerant/Halophilic Plant Growth Promoting

Orhan, Furkan; Demirci, Abdullah

doi:10.1080/01490451.2020.1761911

Cited by 22 publications

(14 citation statements)

References 52 publications

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“…Bacillus haikouensis is halotolerant bacterium isolated from paddy soil, able to grow on up to 17% NaCl ( Li et al, 2014 ). Oceanobacillus picturae is a halophilic phosphate-solubilizing species with demonstrated siderophore production potential, isolated from saline environments and shown to promote plant growth in mangroves and confer salinity stress tolerance in barley ( El-Tarabily and Youssef, 2010 ; Mapelli et al, 2013 ; Orhan and Demirci, 2020 ). Many of our isolates were able to grow at high concentrations of salt (5–17% NaCl).…”

Section: Discussionmentioning

confidence: 99%

Endophytic Bacterial Isolates From Halophytes Demonstrate Phytopathogen Biocontrol and Plant Growth Promotion Under High Salinity

Christakis

Daskalogiannis

Chatzaki³

et al. 2021

Front. Microbiol.

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Halophytic endophytes potentially contribute to the host’s adaptation to adverse environments, improving its tolerance against various biotic and abiotic stresses. Here, we identified the culturable endophytic bacteria of three crop wild relative (CWR) halophytes: Cakile maritima, Matthiola tricuspidata, and Crithmum maritimum. In the present study, the potential of these isolates to improve crop adaptations to various stresses was investigated, using both in vitro and in-planta approaches. Endophytic isolates were identified by their 16S rRNA gene sequence and evaluated for their ability to: grow in vitro in high levels of NaCl; inhibit the growth of the economically important phytopathogens Verticillium dahliae, Ralstonia solanacearum, and Clavibacter michiganensis and the human pathogen Aspergillus fumigatus; provide salt tolerance in-planta; and provide growth promoting effect in-planta. Genomes of selected isolates were sequenced. In total, 115 endophytic isolates were identified. At least 16 isolates demonstrated growth under increased salinity, plant growth promotion and phytopathogen antagonistic activity. Three showed in-planta suppression of Verticillium growth. Furthermore, representatives of three novel species were identified: two Pseudomonas species and one Arthrobacter. This study provides proof-of-concept that the endophytes from CWR halophytes can be used as “bio-inoculants,” for the enhancement of growth and stress tolerance in crops, including the high-salinity stress.

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Section: Discussionmentioning

confidence: 99%

Endophytic Bacterial Isolates From Halophytes Demonstrate Phytopathogen Biocontrol and Plant Growth Promotion Under High Salinity

Christakis

Daskalogiannis

Chatzaki³

et al. 2021

Front. Microbiol.

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“…Bacillus haikouensis is a recently described halotolerant bacterium isolated from paddy soil, able to grow on up to 17% NaCl concentrations [46]. Oceanobacillus picturae is a halophilic phosphate-solubilizing species with demonstrated siderophore production potential that has been isolated from saline environments and has been shown to promote plant growth promotion in mangroves and confer salinity stress tolerance in barley [47][48][49].…”

Section: Discussionmentioning

confidence: 99%

Halophytic bacterial endophytome: a potential source of beneficial microbes for a sustainable agriculture

Christakis

Daskalogiannis

Chatzaki³

et al. 2020

Preprint

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Halophytes have evolved several strategies to survive in saline environments; however, additional support from their associated microbiota could help combat adverse conditions. Endophytic communities of halophytes may be different than those in other plants because salinity acts as an environmental filter. At the same time, they may contribute to the host’s adaptation to adverse environmental conditions and can improve host tolerance against various biotic and abiotic stresses, which may be of importance in modern and sustainable agriculture.In this study the culturable endophytic bacteria of three halophytic species Cakile maritima, Matthiola tricuspidata and Crithmum maritimum were isolated and identified. Endophytic bacteria were isolated from roots and leaves of the sampled plants. Significant differences were observed in bacterial species abundance among different plant species and tissue from which the isolates were obtained. In total, 115 strains were identified by analysis of complete 16S rDNA sequences, while the majority of these isolates were derived from the root samples.The strains were evaluated for their ability to: 1) grow in-vitro in high levels of NaCl; 2) inhibit the growth of the economically important plant pathogenic fungus Verticillium dahliae in vitro and in planta, the human pathogenic fungus Aspergillus fumigatus in vitro, as well as, the economically important plant bacterial pathogens Ralstonia solanacearum and Clavibacter michiganensis in vitro; 3) provide salt tolerance in planta; 4) provide growth promoting effect in planta.Additionally, the genomes of twelve selected isolates, exhibiting interesting features, were sequenced and analysed. Three novel bacterial species were identified that belong to the genus Pseudomonas (two strains) and Arthrobacter (one strain).The outcome of our study is the proof-of-concept that the crop wild relatives (CWR) halophytic microbiome could potentially serve as a source of beneficial microorganisms that could be used (as unique species or as artificial communities) as Bio-Inoculants, for the enhancement of plant growth and stress tolerance in crops, including the high-salinity stress.This is very important in the era of ecosystem degradation and climate change, where the maximizing microbial functions in agroecosystems could be a prerequisite for the future of global sustainable agriculture. Globally, there is a strong need for the identification and bio-banking of novel beneficial endophytic microbes with as many desirable characters, for the development of a new environmentally friendly global strategy in food production that will be based in the sustainable agriculture with low chemical inputs and a low environmental impact.

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“…Due to their active role in regulating a wide variety of plant physiological responses, bacteria associated with host plants from extreme environ-ments appear to be the most promising biological alternatives in the development and improvement of plant production. [66,67]. This could be the consequence of the natural adaptability of these bacteria in extreme environments, and also the selection pressure of these types of ecosystems imposes specific biological responses during the interaction plants-microorganisms [68].…”

Section: Potential Of Halotolerant Pgprs In Desalinizationmentioning

confidence: 99%

Tailoring Next Generation Plant Growth Promoting Microorganisms as Versatile Tools beyond Soil Desalinization: A Road Map towards Field Application

et al. 2021

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Plant growth promoting bacteria (PGPB) have been the target of intensive research studies toward their efficient use in the field as biofertilizers, biocontrol, and bioremediation agents among numerous other applications. Recent trends in the field of PGPB research led to the development of versatile multifaceted PGPB that can be used in different field conditions such as biocontrol of plant pathogens in metal contaminated soils. Unfortunately, all these research efforts lead to the development of PGPB that failed to perform in salty environments. Therefore, it is urgently needed to address this drawback of these PGPB toward their efficient performance in salinity context. In this paper we provide a review of state-of-the-art research in the field of PGPB and propose a road map for the development of next generation versatile and multifaceted PGPB that can perform in salinity. Beyond soil desalinization, our study paves the way towards the development of PGPB able to provide services in diverse salty environments such as heavy metal contaminated, or pathogen threatened. Smart development of salinity adapted next generation biofertilizers will inevitably allow for mitigation and alleviation of biotic and abiotic threats to plant productivity in salty environments.

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Salt Stress Mitigating Potential of Halotolerant/Halophilic Plant Growth Promoting

Cited by 22 publications

References 52 publications

Endophytic Bacterial Isolates From Halophytes Demonstrate Phytopathogen Biocontrol and Plant Growth Promotion Under High Salinity

Endophytic Bacterial Isolates From Halophytes Demonstrate Phytopathogen Biocontrol and Plant Growth Promotion Under High Salinity

Halophytic bacterial endophytome: a potential source of beneficial microbes for a sustainable agriculture

Tailoring Next Generation Plant Growth Promoting Microorganisms as Versatile Tools beyond Soil Desalinization: A Road Map towards Field Application

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