Isolation and Characterization of Cold-Tolerant Hyper-ACC-Degrading Bacteria from the Rhizosphere, Endosphere, and Phyllosphere of Antarctic Vascular Plants

Araya, Macarena A.; Valenzuela, Tamara; Inostroza, Nitza G.; Maruyama, Fumito; Jorquera, Milko A.; Acuña, Jacquelinne J.

doi:10.3390/microorganisms8111788

Cited by 27 publications

(20 citation statements)

References 55 publications

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“…In consequence, Flavobacteriaceae bacteria may play a crucial role in P . annua adaptation to Antarctic conditions by modifying stress responses of the plant during adaptation [ 77 ].…”

Section: Discussionmentioning

confidence: 99%

“…In this respect, studies on the bacterially mediated cold resistance of agricultural crops point toward the action of ACC deaminase [75,76]. This microbially produced enzyme lowers the concentration of plant stress hormone ethylene, a substance that inflicts a significant reduction in plant growth and development [77]. Certain strains of the genus Flavobacterium have displayed ACC deaminase activity [78].…”

Section: Discussionmentioning

confidence: 99%

“…Certain strains of the genus Flavobacterium have displayed ACC deaminase activity [78]. In consequence, Flavobacteriaceae bacteria may play a crucial role in P. annua adaptation to Antarctic conditions by modifying stress responses of the plant during adaptation [77].…”

Section: Discussionmentioning

confidence: 99%

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Bacterial Communities Associated with Poa annua Roots in Central European (Poland) and Antarctic Settings (King George Island)

et al. 2021

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Poa annua (annual bluegrass) is one of the most ubiquitous grass species in the world. In isolated regions of maritime Antarctica, it has become an invasive organism threatening native tundra communities. In this study, we have explored and compared the rhizosphere and root-endosphere dwelling microbial community of P. annua specimens of maritime Antarctic and Central European origin in terms of bacterial phylogenetic diversity and microbial metabolic activity with a geochemical soil background. Our results show that the rhizospheric bacterial community was unique for each sampling site, yet the endosphere communities were similar to each other. However, key plant-associated bacterial taxa such as the Rhizobiaceae family were poorly represented in Antarctic samples, probably due to high salinity and heavy metal concentrations in the soil. Metabolic activity in the Antarctic material was considerably lower than in Central European samples. Antarctic root endosphere showed unusually high numbers of certain opportunistic bacterial groups, which proliferated due to low competition conditions. Thirteen bacterial families were recognized in this study to form a core microbiome of the P. annua root endosphere. The most numerous were the Flavobacteriaceae, suspected to be major contributors to the ecological success of annual bluegrass, especially in harsh, Antarctic conditions.

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“…In consequence, Flavobacteriaceae bacteria may play a crucial role in P . annua adaptation to Antarctic conditions by modifying stress responses of the plant during adaptation [ 77 ].…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Bacterial Communities Associated with Poa annua Roots in Central European (Poland) and Antarctic Settings (King George Island)

et al. 2021

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“…Among agronomically potential organisms, cold-active phosphate solubilizing bacteria, for example, Pseudomonas, have been recovered from glacial ice habitats [18] and other cold ecosystems worldwide such as Andean mountain glaciers [31,32], polar environments [33,34], cold deserts [35,36], Himalayan soils [27,37], and alpine soils [38,39]. Some notable plant growth-promoting bacteria inhabiting the extreme cold environments are Pseudomonas [40,41], Serratia and Staphylococcus [42], Exiguobacterium [43], Rahnella [44], Stenotrophomonas and Leucobacter [45], and Flavobacterium [46]. Cold active microbes have prompted researchers to discover new coldtolerant bacterial species possessing plant growth-promoting abilities [17,43,47], to produce cold-resistant enzymes [48,49] and mitigation of cold effects in plants in agroecosystem to optimize crop production [45].…”

Section: Psychrophiles and Psychrotrophs: An Overview 21 Definition Ecological Habitats And Agronomic Importancementioning

confidence: 99%

Psychrophilic Bacterial Phosphate-Biofertilizers: A Novel Extremophile for Sustainable Crop Production under Cold Environment

et al. 2021

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Abiotic stresses, including low-temperature environments, adversely affect the structure, composition, and physiological activities of soil microbiomes. Also, low temperatures disturb physiological and metabolic processes, leading to major crop losses worldwide. Extreme cold temperature habitats are, however, an interesting source of psychrophilic and psychrotolerant phosphate solubilizing bacteria (PSB) that can ameliorate the low-temperature conditions while maintaining their physiological activities. The production of antifreeze proteins and expression of stress-induced genes at low temperatures favors the survival of such organisms during cold stress. The ability to facilitate plant growth by supplying a major plant nutrient, phosphorus, in P-deficient soil is one of the novel functional properties of cold-tolerant PSB. By contrast, plants growing under stress conditions require cold-tolerant rhizosphere bacteria to enhance their performance. To this end, the use of psychrophilic PSB formulations has been found effective in yield optimization under temperature-stressed conditions. Most of the research has been done on microbial P biofertilizers impacting plant growth under normal cultivation practices but little attention has been paid to the plant growth-promoting activities of cold-tolerant PSB on crops growing in low-temperature environments. This scientific gap formed the basis of the present manuscript and explains the rationale for the introduction of cold-tolerant PSB in competitive agronomic practices, including the mechanism of solubilization/mineralization, release of biosensor active biomolecules, molecular engineering of PSB for increasing both P solubilizing/mineralizing efficiency, and host range. The impact of extreme cold on the physiological activities of plants and how plants overcome such stresses is discussed briefly. It is time to enlarge the prospects of psychrophilic/psychrotolerant phosphate biofertilizers and take advantage of their precious, fundamental, and economical but enormous plant growth augmenting potential to ameliorate stress and facilitate crop production to satisfy the food demands of frighteningly growing human populations. The production and application of cold-tolerant P-biofertilizers will recuperate sustainable agriculture in cold adaptive agrosystems.

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“…Chile is a 4500 km long and narrow country that includes a wide variety of climates and extreme ecosystems, such as the Atacama Desert, Altiplano, the Andes Mountains, Patagonia, and Antarctica [ 30 , 31 ]. Psychrotolerant PGPB from areas with extreme environments such as Chilean Andes Mountains, Patagonia, and Antarctica, Canadian Arctic, and High Indian Himalayas have been isolated [ 17 , 19 , 20 , 21 , 22 , 26 , 30 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Microbial Diversity of Psychrotolerant Bacteria Isolated from Wild Flora of Andes Mountains and Patagonia of Chile towards the Selection of Plant Growth-Promoting Bacterial Consortia to Alleviate Cold Stress in Plants

et al. 2021

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Cold stress decreases the growth and productivity of agricultural crops. Psychrotolerant plant growth-promoting bacteria (PGPB) may protect and promote plant growth at low temperatures. The aims of this study were to isolate and characterize psychrotolerant PGPB from wild flora of Andes Mountains and Patagonia of Chile and to formulate PGPB consortia. Psychrotolerant strains were isolated from 11 wild plants (rhizosphere and phyllosphere) during winter of 2015. For the first time, bacteria associated with Calycera, Orites, and Chusquea plant genera were reported. More than 50% of the 130 isolates showed ≥33% bacterial cell survival at temperatures below zero. Seventy strains of Pseudomonas, Curtobacterium, Janthinobacterium, Stenotrophomonas, Serratia, Brevundimonas, Xanthomonas, Frondihabitans, Arthrobacter, Pseudarthrobacter, Paenarthrobacter, Brachybacterium, Clavibacter, Sporosarcina, Bacillus, Solibacillus, Flavobacterium, and Pedobacter genera were identified by 16S rRNA gene sequence analyses. Ten strains were selected based on psychrotolerance, auxin production, phosphate solubilization, presence of nifH (nitrogenase reductase) and acdS (1-aminocyclopropane-1-carboxylate (ACC) deaminase) genes, and anti-phytopathogenic activities. Two of the three bacterial consortia formulated promoted tomato plant growth under normal and cold stress conditions. The bacterial consortium composed of Pseudomonas sp. TmR5a & Curtobacterium sp. BmP22c that possesses ACC deaminase and ice recrystallization inhibition activities is a promising candidate for future cold stress studies.

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Isolation and Characterization of Cold-Tolerant Hyper-ACC-Degrading Bacteria from the Rhizosphere, Endosphere, and Phyllosphere of Antarctic Vascular Plants

Cited by 27 publications

References 55 publications

Bacterial Communities Associated with Poa annua Roots in Central European (Poland) and Antarctic Settings (King George Island)

Bacterial Communities Associated with Poa annua Roots in Central European (Poland) and Antarctic Settings (King George Island)

Psychrophilic Bacterial Phosphate-Biofertilizers: A Novel Extremophile for Sustainable Crop Production under Cold Environment

Microbial Diversity of Psychrotolerant Bacteria Isolated from Wild Flora of Andes Mountains and Patagonia of Chile towards the Selection of Plant Growth-Promoting Bacterial Consortia to Alleviate Cold Stress in Plants

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