Bacterial-mediated drought tolerance: Current and future prospects

Ngumbi, Esther; Kloepper, Joseph W.

doi:10.1016/j.apsoil.2016.04.009

Cited by 378 publications

(239 citation statements)

References 158 publications

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“…dry or wet; Lau and Lennon, 2012). In addition to the effect of the rhizosphere microbiome on plant responses to drought, inoculation of individual bacterial strains has also been shown to improve plant resistance to drought (reviewed in Ngumbi and Kloepper, 2016). The plant-growth-promoting rhizobacterium (PGPR) Paenibacillus polymyxa can protect Arabidopsis against drought stress and upregulate expression of drought-stress response genes (Timmusk and Wagner, 1999).…”

Section: Microbial-mediated Drought Tolerance In Plantsmentioning

confidence: 99%

The role of water in plant–microbe interactions

2018

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SUMMARYThroughout their life plants are associated with various microorganisms, including commensal, symbiotic and pathogenic microorganisms. Pathogens are genetically adapted to aggressively colonize and proliferate in host plants to cause disease. However, disease outbreaks occur only under permissive environmental conditions. The interplay between host, pathogen and environment is famously known as the 'disease triangle'. Among the environmental factors, rainfall events, which often create a period of high atmospheric humidity, have repeatedly been shown to promote disease outbreaks in plants, suggesting that the availability of water is crucial for pathogenesis. During pathogen infection, water-soaking spots are frequently observed on infected leaves as an early symptom of disease. Recent studies have shown that pathogenic bacteria dedicate specialized virulence proteins to create an aqueous habitat inside the leaf apoplast under high humidity. Water availability in the apoplastic environment, and probably other associated changes, can determine the success of potentially pathogenic microbes. These new findings reinforce the notion that the fight over water may be a major battleground between plants and pathogens. In this article, we will discuss the role of water availability in host-microbe interactions, with a focus on plant-bacterial interactions.

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Section: Microbial-mediated Drought Tolerance In Plantsmentioning

confidence: 99%

The role of water in plant–microbe interactions

2018

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“…Drought and extreme heat, in particular, have been the reason for up to 10% decline in yield of cereals around the world making it the top challenge to crop production (Lesky et al, 2016). Scope for tackling drought using PGPR, i.e., rhizosphere microbiome, is a good option (Ngumbi and Kloepper, 2016). With the current knowledge on the plant microbiome, which is mainly concentrated on bacterial communities, we suggest to co-propagate the microbiome with the plant offspring in the new cultivation with a starter microbiome culture of keystone plant-beneficial microbiota from the target soils.…”

Section: Co-propagating the Co-evolvedmentioning

confidence: 99%

Microbiome Selection Could Spur Next-Generation Plant Breeding Strategies

2016

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“No plant is an island too…”Plants, though sessile, have developed a unique strategy to counter biotic and abiotic stresses by symbiotically co-evolving with microorganisms and tapping into their genome for this purpose. Soil is the bank of microbial diversity from which a plant selectively sources its microbiome to suit its needs. Besides soil, seeds, which carry the genetic blueprint of plants during trans-generational propagation, are home to diverse microbiota that acts as the principal source of microbial inoculum in crop cultivation. Overall, a plant is ensconced both on the outside and inside with a diverse assemblage of microbiota. Together, the plant genome and the genes of the microbiota that the plant harbors in different plant tissues, i.e., the ‘plant microbiome,’ form the holobiome which is now considered as unit of selection: ‘the holobiont.’ The ‘plant microbiome’ not only helps plants to remain fit but also offers critical genetic variability, hitherto, not employed in the breeding strategy by plant breeders, who traditionally have exploited the genetic variability of the host for developing high yielding or disease tolerant or drought resistant varieties. This fresh knowledge of the microbiome, particularly of the rhizosphere, offering genetic variability to plants, opens up new horizons for breeding that could usher in cultivation of next-generation crops depending less on inorganic inputs, resistant to insect pest and diseases and resilient to climatic perturbations. We surmise, from ever increasing evidences, that plants and their microbial symbionts need to be co-propagated as life-long partners in future strategies for plant breeding. In this perspective, we propose bottom–up approach to co-propagate the co-evolved, the plant along with the target microbiome, through – (i) reciprocal soil transplantation method, or (ii) artificial ecosystem selection method of synthetic microbiome inocula, or (iii) by exploration of microRNA transfer method – for realizing this next-generation plant breeding approach. Our aim, thus, is to bring closer the information accrued through the advanced nucleotide sequencing and bioinformatics in conjunction with conventional culture-dependent isolation method for practical application in plant breeding and overall agriculture.

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“…Within abiotic stresses, drought affects plant-water relationship, deteriorates growth, influences nutrition and plant development negatively (Schleuning et al 2016). These effects decrease agriculture cultivation production (Ngumbi and Kloepper 2016) where wheat, rice and barley have been the most reported (Carmen and Roberto 2011). Drought, jointly with climate change, will have caused serious problems for 50% of cultivation land around the world by 2050 (Savo et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Enhancement of drought tolerance on guinea grass by dry alginate macrobeads as inoculant of Bacillus strains

Mendoza-Labrador

Romero-Perdomo

Hernández³

et al. 2019

Preprint

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Drought is responsible for almost 70% of total crop damage in tropical and subtropical countries. In the Colombian Caribbean, drought has caused low availability of Guinea grass (Megathyrsus maximus) in forage amount and quality, generating increase in production costs in livestock systems. In this study, we aimed at designing and evaluating dry macro-polymeric inoculants of Bacillus strains and used them successfully to mitigate drought effect on Guinea grass (M. maximus). We chose Bacillus sp XT13 and Bacillus megaterium XT14 strains, previously selected for their capacity to mitigate drought stress on Guinea grass. For the inoculant formulation process, a concentration of 3.2% alginate was used for both microorganisms, selecting the polymer-bacterium ratio of 70:30 for XT13 and 80:20 for XT14. The results of the experiments in greenhouse showed that drought had a negative effect on Guinea grass growth, but the PGPB application with or without macro-polymeric dry matrix improved plant growth significantly. We also observed that co-inoculation of the strains generated a greater beneficial effect than individual inoculation. Interestingly, co-inoculation of XT13 and XT14 under the dry macro-polymeric formulation increased biomass production of the aerial part (7.32%), root biomass, (25.3%), nutritional quality parameters, such as digestibility (3.32%), protein (20.3%); proline accumulation increased (21.06%) and both neutral digestible fiber (2.43%) and APX antioxidant activity (24.2%) decreased with respect to co-inoculation of both bacteria without formulation. These findings have shown that dry macrobeads immobilization has a significantly positive influence on the capacity of XT13 and XT14 bacterial strains to induce drought stress tolerance in Guinea grass.

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Bacterial-mediated drought tolerance: Current and future prospects

Cited by 378 publications

References 158 publications

The role of water in plant–microbe interactions

The role of water in plant–microbe interactions

Microbiome Selection Could Spur Next-Generation Plant Breeding Strategies

Enhancement of drought tolerance on guinea grass by dry alginate macrobeads as inoculant of Bacillus strains

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