Rhizosphere microbiomes can regulate plant drought tolerance

Aslam, Mehtab Muhammad; Okal, Eyalira Jacob; Idris, Aisha Lawan; Zhang, Qian; Xu, Weifeng; Karanja, Joseph K.; Wani, Shabir Hussain; Yuan, Wei

doi:10.1016/s1002-0160(21)60061-9

Cited by 44 publications

(21 citation statements)

References 124 publications

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“…Severe drought stress decreases the size and activity of rhizosphere microbial biomass (Sanaullah et al, 2011). Microbes have adopted various strategies to thrive in the rhizosphere niche (Aslam et al, 2022; Jacoby et al, 2017). Many bacterial genera release exopolysaccharides (EPS) (Costa et al, 2018) including Bacillus, Pseudomonas and Azospirillum brasilense , which permeate the surrounding soils bonding them together and increasing their aggregation to the root surface as mucilage dries (Walker et al, 2003).…”

Section: Mechanisms Of Rhizosheath Formationmentioning

confidence: 99%

Rhizosheath: An adaptive root trait to improve plant tolerance to phosphorus and water deficits?

Aslam

Karanja

Dodd

et al. 2022

Plant Cell & Environment

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Drought and nutrient limitations adversely affect crop yields, with below-ground traits enhancing crop production in these resource-poor environments. This review explores the interacting biological, chemical and physical factors that determine rhizosheath (soil adhering to the root system) development, and its influence on plant water uptake and phosphorus acquisition in dry soils. Identification of quantitative trait loci for rhizosheath development indicate it is genetically determined, but the microbial community also directly (polysaccharide exudation) and indirectly (altered root hair development) affect its extent. Plants with longer and denser root hairs had greater rhizosheath development and increased P uptake efficiency. Moreover, enhanced rhizosheath formation maintains contact at the rootsoil interface thereby assisting water uptake from drying soil, consequently improving plant survival in droughted environments. Nevertheless, it can be difficult to determine if rhizosheath development is a cause or consequence of improved plant adaptation to dry and nutrient-depleted soils. Does rhizosheath development directly enhance plant water and phosphorus use, or do other tolerance mechanisms allow plants to invest more resources in rhizosheath development? Much more work is required on the interacting genetic, physical, biochemical and microbial mechanisms that determine rhizosheath development, to demonstrate that selection for rhizosheath development is a viable crop improvement strategy. K E Y W O R D S alternate wetting and drying cycles, drought, QTLs, water uptake 1 | INTRODUCTIONClimate change has generally increased the frequency and intensity of drought in the world's arable soils, thereby restricting crop yields (Fahad et al., 2017;Potopová et al., 2016). Crop productivity is also influenced by its nutritional status such as phosphorus (P) deficiency, which alters plant physiological functions and limits yields (Bista et al., 2018; Farooq et al., 2021). Drought stress and P deficiency frequently co-occur since any restriction in transpiration limits the uptake of water and nutrients, and may cause agronomic effects that

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Section: Mechanisms Of Rhizosheath Formationmentioning

confidence: 99%

Rhizosheath: An adaptive root trait to improve plant tolerance to phosphorus and water deficits?

Aslam

Karanja

Dodd

et al. 2022

Plant Cell & Environment

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“…Plant-growth-promoting rhizobacteria can ameliorate drought stress and improve agronomic sustainability ( Kanwal et al, 2017 ; Vanamala et al, 2021 ; Aslam et al, 2022 ). PGPR alleviate drought stress via rhizobacteria-induced drought endurance and resilience (RIDER), which induces biochemical changes ( Rubin et al, 2017 ; Khan et al, 2018 ; Ansari and Ahmad, 2019 ).…”

Section: Microbes That Mitigate Drought Stressmentioning

confidence: 99%

Research Progress in the Field of Microbial Mitigation of Drought Stress in Plants

et al. 2022

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Plants defend themselves against ecological stresses including drought. Therefore, they adopt various strategies to cope with stress, such as seepage and drought tolerance mechanisms, which allow plant development under drought conditions. There is evidence that microbes play a role in plant drought tolerance. In this study, we presented a review of the literature describing the initiation of drought tolerance mediated by plant inoculation with fungi, bacteria, viruses, and several bacterial elements, as well as the plant transduction pathways identified via archetypal functional or morphological annotations and contemporary “omics” technologies. Overall, microbial associations play a potential role in mediating plant protection responses to drought, which is an important factor for agricultural manufacturing systems that are affected by fluctuating climate.

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“…Despite the fact that microbes have been successfully used in a number of plant species [35][36][37], to our knowledge, no bio-fertilizer provides a full range of nutrients or is suitable for all plant species under changing climatic conditions [38]. There is still a large gap between the potential of PGPR and its practical use as an organic fertilizer in plant production [39] as far as the assembly, composition, and structure of rhizospheric microbes; and plant-microbe interactions occurring under drought stress conditions remain mostly unknown [40]. There is also a considerable lack of knowledge not only about the physiological effects of PGPR preparations suitable for tomato production, but also suitable bacterial strain combinations and the ripening stage at which the treatment should be applied.…”

Section: Introductionmentioning

confidence: 99%

Impact of Plant Growth-Promoting Rhizobacteria Inoculation on the Physiological Response and Productivity Traits of Field-Grown Tomatoes in Hungary

et al. 2022

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Drought-tolerant plant growth-promoting rhizobacteria (PGPR) may promote plant development under limited water supply conditions, when plant’s water demand is not completely satisfied under rain-fed conditions or when irrigation water availability is limited. The aim of this study was to examine the effects of two inoculation treatments (B2: Alcaligenes sp. 3573, Bacillus sp. BAR16, and Bacillus sp. PAR11 strains and B3: Pseudomonas sp. MUS04, Rhodococcus sp. BAR03, and Variovorax sp. BAR04 strains) and compare those to a control (B0) without artificial inoculation on chlorophyll fluorescence, leaf chlorophyll content (SPAD value), canopy temperature, and the yield of the processing tomato cultivar H-1015 F1 grown under field conditions. The young seedlings of the hybrid tomato variety H-1015 F1 were immersed in 1% of B2 or B3 products (BAY-BIO, Szeged Hungary) for 5 min. Inoculated and untreated seedlings were grown under three irrigation treatments [regular irrigation (RI), deficit irrigation (DI), and no irrigation (I0)], to reveal the effect of PGPR under different levels of water stress. In the dry year (2018), higher canopy temperature and chlorophyll fluorescence (Fv/Fm) were measured during flowering in plants treated with bacteria than in untreated plants. In the stage of flowering and fruit setting, the B3 treatment led to a significant decrease in the Fv/Fm value, canopy temperature remained high, and the SPAD value was statistically the same in all treatments. Under limited water supply, in most cases, PGPR led to a significantly greater total yield but more unripe green berries compared to untreated plants. Under moderate water shortage (dry year + deficit irrigation), the B3 treatment resulted in 26% more ripe, marketable fruit and 49% less unripe fruit compared to the B2 treatment. On the other hand, in the wet year (2020), the bacterial treatments generally did not affect physiological properties, though the B2 treatment produced a higher marketable yield while the amount of green and diseased fruits did not differ statistically, compared to the B3 treatment under deficit irrigation. Based on our study, we recommend the application of the B3 PGPR product as it positively affected key physiological processes, leading to a higher marketable yield particularly under water shortage.

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Rhizosphere microbiomes can regulate plant drought tolerance

Cited by 44 publications

References 124 publications

Rhizosheath: An adaptive root trait to improve plant tolerance to phosphorus and water deficits?

Rhizosheath: An adaptive root trait to improve plant tolerance to phosphorus and water deficits?

Research Progress in the Field of Microbial Mitigation of Drought Stress in Plants

Impact of Plant Growth-Promoting Rhizobacteria Inoculation on the Physiological Response and Productivity Traits of Field-Grown Tomatoes in Hungary

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