Drought adaptive microbes as bioinoculants for the horticultural crops

Kour, Divjot; Khan, Sofia Shareif; Kaur, Tanvir; Kour, Harpreet; Singh, Gagandeep; Yadav, Ashok; Yadav, Ajar Nath

doi:10.1016/j.heliyon.2022.e09493

Cited by 26 publications

(11 citation statements)

References 162 publications

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“…Among them, the strains ATMLC92021 and ATMLC152021 were closely related to Bacillus subtilis . In previous studies, some strains of this species have been reported to improve the drought tolerance in sugarcane, fenugreek, and wheat [ 26 , 27 , 28 ]. In addition, the strain ATMLC102021 was closely related to B. tequilensis clade; this species was described as osmotic stress-tolerant and presented with the capacity to improve drought stress tolerance in maize, wheat, and eggplant [ 29 , 30 ].…”

Section: Discussionmentioning

confidence: 99%

Enhancing Water Status and Nutrient Uptake in Drought-Stressed Lettuce Plants (Lactuca sativa L.) via Inoculation with Different Bacillus spp. Isolated from the Atacama Desert

Santander,

González,

Pérez

et al. 2024

Plants

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Drought is a major challenge for agriculture worldwide, being one of the main causes of losses in plant production. Various studies reported that some soil’s bacteria can improve plant tolerance to environmental stresses by the enhancement of water and nutrient uptake by plants. The Atacama Desert in Chile, the driest place on earth, harbors a largely unexplored microbial richness. This study aimed to evaluate the ability of various Bacillus sp. from the hyper arid Atacama Desert in the improvement in tolerance to drought stress in lettuce (Lactuca sativa L. var. capitata, cv. “Super Milanesa”) plants. Seven strains of Bacillus spp. were isolated from the rhizosphere of the Chilean endemic plants Metharme lanata and Nolana jaffuelii, and then identified using the 16s rRNA gene. Indole acetic acid (IAA) production, phosphate solubilization, nitrogen fixation, and 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity were assessed. Lettuce plants were inoculated with Bacillus spp. strains and subjected to two different irrigation conditions (95% and 45% of field capacity) and their biomass, net photosynthesis, relative water content, photosynthetic pigments, nitrogen and phosphorus uptake, oxidative damage, proline production, and phenolic compounds were evaluated. The results indicated that plants inoculated with B. atrophaeus, B. ginsengihumi, and B. tequilensis demonstrated the highest growth under drought conditions compared to non-inoculated plants. Treatments increased biomass production and were strongly associated with enhanced N-uptake, water status, chlorophyll content, and photosynthetic activity. Our results show that specific Bacillus species from the Atacama Desert enhance drought stress tolerance in lettuce plants by promoting several beneficial plant traits that facilitate water absorption and nutrient uptake, which support the use of this unexplored and unexploited natural resource as potent bioinoculants to improve plant production under increasing drought conditions.

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Section: Discussionmentioning

confidence: 99%

Enhancing Water Status and Nutrient Uptake in Drought-Stressed Lettuce Plants (Lactuca sativa L.) via Inoculation with Different Bacillus spp. Isolated from the Atacama Desert

Santander,

González,

Pérez

et al. 2024

Plants

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“…Plant growth-promoting rhizobacteria which possess the enzyme 1-aminocyclopropane-1-carboxylate (ACC) deaminase facilitate plant growth and development by decreasing ethylene levels, inducing a reduction in drought stress in plants [ 51 ]. The production of key traits for PGPR strains was found among many representatives of the bacteria used in this work and they were also tested in the context of drought [ 52 , 53 , 54 , 55 ].…”

Section: Discussionmentioning

confidence: 99%

Effects of Rhizosphere Bacteria on Strawberry Plants (Fragaria × ananassa Duch.) under Water Deficit

Paliwoda

Mikiciuk

et al. 2022

IJMS

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Due to the observed climate warming, water deficiency in soil is currently one of the most important stressors limiting the size and quality of plant crops. Drought stress causes a number of morphological, physiological, and biochemical changes in plants, limiting their growth, development, and yield. Innovative methods of inducing resistance and protecting plants against stressors include the inoculation of crops with beneficial microorganisms isolated from the rhizosphere of the plant species to which they are to be applied. The aim of the present study was to evaluate 12 different strains of rhizosphere bacteria of the genera Pantoea, Bacillus, Azotobacter, and Pseudomonas by using them to inoculate strawberry plants and assessing their impact on mitigating the negative effects of drought stress. Bacterial populations were assessed by estimates of their size based on bacterial counts in the growth substrate and with bioassays for plant growth-promoting traits. The physiological condition of strawberry plants was determined based on the parameters of chlorophyll fluorescence. The usefulness of the test methods used to assess the influence of plant inoculation with rhizosphere bacteria on the response of plants growing under water deficit was also evaluated. A two-factor experiment was performed in a complete randomization design. The first experimental factor was the inoculation of plant roots with rhizosphere bacteria. The second experimental factor was the different moisture content of the growth substrate. The water potential was maintained at −10 to −15 kPa under control conditions, and at −40 to −45 kPa under the conditions of water deficit in the substrate. The tests on strawberry plants showed that the highest sensitivity to water deficiency, and thus the greatest usefulness for characterizing water stress, was demonstrated by the following indices of chlorophyll “a” fluorescence: FM, FV, FV/FM, PI, and Area. Based on the assessment of the condition of the photosynthetic apparatus and the analysis of chlorophyll “a” fluorescence indices, including hierarchical cluster analysis, the following strains of rhizosphere bacteria were found to have favorable effects on strawberry plants under water deficit: the Bacillus sp. strains DLGB2 and DKB26 and the Pantoea sp. strains DKB63, DKB70, DKB68, DKB64, and DKB65. In the tests, these strains of Bacillus sp. exhibited a common trait—the ability to produce siderophores, while those of Pantoea sp. were notable for phosphate mobilization and ACCD activity.

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“…Additionally, (Verma et al, 2021) found that the endophytic Streptomyces geysiriensis strain produces IAA and GA3 which stimulate indigenous levels of plant hormones; thus, endophytes modulate developmental or signaling processes in plants. Moreover, numerous mechanisms of action for Streptomyces have been identified, including assisting plants in acquiring nutrients, creating growth regulators including (SA) and proline (Pro), and reducing levels of the stress hormone ethylene (Kour et al, 2022). With the current advancement in microbial ecology, endophytic Streptomyces are gaining popularity.…”

Section: Plant Growth Regulation Ability By Strep Enissocaesilismentioning

confidence: 99%

Endophytic Streptomyces enissocaesilis As a Nematicidal and Biostimulant Agent

El-Akshar

El-Meihy

Tewfike

et al. 2022

Egyptian Academic Journal of Biological Sciences, G. Microbiolo

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INTRODUCTIONMeloidogyne incognita, one of the most common species of root-knot root nematodes which capable of infecting approximately 3,000 plant species worldwide and resulting in approximately 5% of global crop loss (Lu et al., 2022). The root-knot galls produced by M. incognita larvae cause the plant to lose nutrients through gall-like swellings known as root-knot galls. If the plants are young, the infection causes them to suffer and possibly die, but if they are mature, it causes a decrease in yield and increases their susceptibility to water and nutrient stress (El-Ashry et al., 2022). Their widespread distribution, a vast variety of potential hosts, and connection to fungus, bacteria, and viruses provide a pressing problem (Wagh et al., 2022). Because the disease's above-ground symptoms and indicators, such as incipient wilt, stunting, and low yields, are like those of nutrient insufficiency, many producers are really unaware of root-knot nematodes (Loan et al., 2018).Numerous nematicides and soil fumigants have been used extensively in the past several decades to manage the root-knot nematode disease, but these extremely toxic pesticides have had major negative effects on the environment, human health, and the development of nematode multi-drug resistance (Rajasekharan et al., 2020).

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Drought adaptive microbes as bioinoculants for the horticultural crops

Cited by 26 publications

References 162 publications

Enhancing Water Status and Nutrient Uptake in Drought-Stressed Lettuce Plants (Lactuca sativa L.) via Inoculation with Different Bacillus spp. Isolated from the Atacama Desert

Enhancing Water Status and Nutrient Uptake in Drought-Stressed Lettuce Plants (Lactuca sativa L.) via Inoculation with Different Bacillus spp. Isolated from the Atacama Desert

Effects of Rhizosphere Bacteria on Strawberry Plants (Fragaria × ananassa Duch.) under Water Deficit

Endophytic Streptomyces enissocaesilis As a Nematicidal and Biostimulant Agent

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