Actinobacterium isolated from a semi-arid environment improves the drought tolerance in maize (Zea mays L.)

Selim, Samy; Hassan, Yasser M.; Saleh, Ahmed M.; Habeeb, Talaat H.; AbdElgawad, Hamada

doi:10.1016/j.plaphy.2019.06.029

Cited by 43 publications

(24 citation statements)

References 43 publications

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“…In addition, the Ac5 inoculated plants also accumulated compatible solutes including soluble sugars, sucrose, proline, glycine betaine, and arginine. This study demonstrates the comprehensive effect of Actinobacteria as PGPRs to combat drought stress, and highlights the fundamental role of rhizobacterial communities in drought resistant desert plants (Selim et al, 2019).…”

Section: Showcase: the Arabian Peninsula Desertsmentioning

confidence: 68%

“…In the Al Jouf region in North Saudi, a PGPB Actinobacteria isolate (Ac5) was obtained from the rhizosphere of the drought resistant desert plant P. turgidum by Selim et al (2019). This Ac5 isolate could produce flavonoids, phytohormones and siderophores, and the inoculation of Ac5 with maize plants have significantly reduced the detrimental effects of drought stress.…”

Section: Showcase: the Arabian Peninsula Desertsmentioning

confidence: 99%

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Desert Microbes for Boosting Sustainable Agriculture in Extreme Environments

2020

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A large portion of the earth's surface consists of arid, semi-arid and hyper-arid lands. Life in these regions is profoundly challenged by harsh environmental conditions of water limitation, high levels of solar radiation and temperature fluctuations, along with soil salinity and nutrient deficiency, which have serious consequences on plant growth and survival. In recent years, plants that grow in such extreme environments and their naturally associated beneficial microbes have attracted increased interest. The rhizosphere, rhizosheath, endosphere, and phyllosphere of desert plants display a perfect niche for isolating novel microbes. They are well adapted to extreme environments and offer an unexploited reservoir for bio-fertilizers and bio-control agents against a wide range of abiotic and biotic stresses that endanger diverse agricultural ecosystems. Their properties can be used to improve soil fertility, increase plant tolerance to various environmental stresses and crop productivity as well as benefit human health and provide enough food for a growing human population in an environment-friendly manner. Several initiatives were launched to discover the possibility of using beneficial microbes. In this review, we will be describing the efforts to explore the bacterial diversity associated with desert plants in the arid, semi-arid, and hyper-arid regions, highlighting the latest discoveries and applications of plant growth promoting bacteria from the most studied deserts around the world.

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Section: Showcase: the Arabian Peninsula Desertsmentioning

confidence: 68%

Section: Showcase: the Arabian Peninsula Desertsmentioning

confidence: 99%

Desert Microbes for Boosting Sustainable Agriculture in Extreme Environments

2020

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“…We further discovered that Actinobacteria, Acidobacteria, Proteobacteria, Planctomycetes, Bacteroidetes were the top contributing bacterial populations in soil with a lower moisture content, and may have significant biological importance under drought conditions. For example, Actinobacterium isolated from semi-arid environments has been reported to enhance the drought tolerance in maize (Selim et al 2019), while Acidobacteria, Proteobacteria, and Bacteroidetes are ubiquitous in soils thus explaining its importance (Chowdhury et al 2019;Chodak et al 2015). Acidobacteria has been reported to exist in nutrient poor soil with low carbon availability (Fierer, Bradford, and Jackson 2007).…”

Section: Figurementioning

confidence: 99%

Detection of stress functional responses in bacterial populations under dry soil conditions show potential microbial mechanisms to resist drought conditions

Sarkar

Ward

Jansson

et al. 2020

Preprint

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Climate change is predicted to have a negative effect on the grasslands of the United States and will be detrimental to the economy and environment. The changing precipitation levels would also have an effect on the structural and functional potential of associated soil microbiome communities, which in turn will regulate the health of the plants during stressful conditions. In this study, we applied metagenomics analyses to capture the responses of the bacterial populations under drier soil conditions. We collected soil from two sites (dry and wet) at the Konza Long-Term Ecological Research field station in Kansas, which had characteristic features of the native prairies. Soil drying resulted in a significant shift in the bacterial population at the community level. Following that, fifteen bacterial genomes were short-listed based on the availability in the public database, higher relative abundance in dry soils than in wet, and also according to their contributions in drier soil. The potential microbial mechanisms were elucidated when an in-depth analysis of the functional genes was performed. Translation elongation factor EF-Tu, thiamine biosynthesis protein, and catalase were identified as a part of the overall stress functional responses in the bacterial population in this study. We speculate that these identified bacterial populations are important for maintaining the health of the soil under dry conditions. Genes and/or pathways found in this study provide insights into microbial mechanisms that these bacterial populations might employ to resist challenging drought conditions.

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“…It is plausible that an increased abundance of a number of bacterial genera found through our analysis in the low water samples can be explained by their ability to increase drought stress resilience through hopanoids biosynthesis. In addition, Actinobacteria have been described to be able to grow under unusually low moisture conditions both in the lab and in natural environment (72,73), owing to their exceptional ability to adapt transcriptionally as well as the structure and thickness of their Gram-positive peptidoglycan cell wall layer (74).…”

Section: Links Between Microbial Communities and Plant Performancementioning

confidence: 99%

Microbial’s Effects on Invasive Grass’ Response to Water and Nutrient Stress

Zhang

Yuan

Pajerowska-Mukhtar

et al. 2020

Preprint

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Background Soil microbiomes play important roles in invasion biology, yet it is often treated as a ‘black box’ in modeling or large-scale field studies. Hence, investigating the change of association between invasive vegetation and soil microbes under changing environmental conditions, and exploring the genetic functions of associated microbiomes will provide a deeper understanding of invasion mechanisms. We performed a microcosm experiment with cogongrass (Imperata cylindrica (L.) P. Beauv.), which is one of the 100 worst invasive plants in the world. We combined rigorous sequencing analysis, including 16S rRNA, ITS, and shotgun metagenome sequencing, for the first time, to investigate the interactive effect of change in soil water and nutrient concentrations on microbiomes diversity, composition and genetic functions under invasion. Results We found that experimental drought has a stronger effect on the bacterial community than the fungal community. We discovered an enrichment of microbial groups, including Proteobacteria, Actinobacteria, Bacteroidetes and Chloroflexi under drought treatment, could likely contribute to invasion success. Further, we showed a striking trend of induction of cell wall, membrane and desiccation-related genes in drought treatment and a marked downregulation in regular treatment, which could create a more hydrated microenvironment, facilitating biofilm formation and better protection from desiccation.Conclusions Our work contributes to highlighting the associated microbial communities may have a potential long-term impact on increasing cogongrass drought resistance, ultimately, future invasion might be severe due to the plant-microbe interaction. These findings are important because current modeling practice, lacking comprehensive consideration of the plant-microbe interaction, could lead to a significant underestimate of predictions of future invasion patterns.

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Actinobacterium isolated from a semi-arid environment improves the drought tolerance in maize (Zea mays L.)

Cited by 43 publications

References 43 publications

Desert Microbes for Boosting Sustainable Agriculture in Extreme Environments

Desert Microbes for Boosting Sustainable Agriculture in Extreme Environments

Detection of stress functional responses in bacterial populations under dry soil conditions show potential microbial mechanisms to resist drought conditions

Microbial’s Effects on Invasive Grass’ Response to Water and Nutrient Stress

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