Plant Growth-Promoting Microbes: Role and Prospective in Amelioration of Salt Stress

Choudhary, Madhu; Chandra, Priyanka; Dixit, B. S.; Nehra, Vibha; Choudhary, Urmila; Choudhary, Sharda

doi:10.1080/00103624.2022.2063316

Cited by 24 publications

(18 citation statements)

References 129 publications

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“…Plant priming represents a promising method to reduce the time required for a plant exposed to abiotic stress to respond efficiently to the stressor and, thereby, to increase the tolerance to stress conditions (Aranega-Bou et al, 2014). Effective priming agents against salt stress in tomato, which have been studied over years are elements (Fe, Si, K, N), plant growth regulators (ACC, IAA, SA, melatonin), reactive species (S-nitrosoglutathione, sodium hydrosulfide, sodium nitroprusside), vitamins (ascorbic acid -AsA), aminoacids, natural extracts (seaweed), polymers (chitosan), osmoprotectants (glycine betaine, proline), polyamines (spermidine) or plant growth promoting microorganisms (bacteria, fungi or arbuscular mycorrhizal fungi) (Choudhary et al, 2022;Gedeon et al, 2022;Zulfiqar et al, 2022). The results showed in most of the cases an enhancement of the tolerance of plants to various concentrations of salt, by decreasing the osmotic stress, enhancing the activity of the antioxidant system, increasing the growth and yield or by improving the fruit quality.…”

Section: Recommendations For Alleviating the Effects Of Salinity On T...mentioning

confidence: 99%

Tomato responses to salinity stress: From morphological traits to genetic changes

2023

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Tomato is an essential annual crop providing human food worldwide. It is estimated that by the year 2050 more than 50% of the arable land will become saline and, in this respect, in recent years, researchers have focused their attention on studying how tomato plants behave under various saline conditions. Plenty of research papers are available regarding the effects of salinity on tomato plant growth and development, that provide information on the behavior of different cultivars under various salt concentrations, or experimental protocols analyzing various parameters. This review gives a synthetic insight of the recent scientific advances relevant into the effects of salinity on the morphological, physiological, biochemical, yield, fruit quality parameters, and on gene expression of tomato plants. Notably, the works that assessed the salinity effects on tomatoes were firstly identified in Scopus, PubMed, and Web of Science databases, followed by their sifter according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guideline and with an emphasis on their results. The assessment of the selected studies pointed out that salinity is one of the factors significantly affecting tomato growth in all stages of plant development. Therefore, more research to find solutions to increase the tolerance of tomato plants to salinity stress is needed. Furthermore, the findings reported in this review are helpful to select, and apply appropriate cropping practices to sustain tomato market demand in a scenario of increasing salinity in arable lands due to soil water deficit, use of low-quality water in farming and intensive agronomic practices.

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Section: Recommendations For Alleviating the Effects Of Salinity On T...mentioning

confidence: 99%

Tomato responses to salinity stress: From morphological traits to genetic changes

2023

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“…High salt concentration leads to osmotic stress that interferes with physiology, biochemical functioning (photosynthesis, stomatal conductance, enzyme activities, water and nutrient uptake), growth and yield of crops ( Yasmin et al., 2021b ; Choudhary et al., 2022 ). Microbial application triggers various mechanisms for improving plant growth under salinity stress ( Sarkar et al., 2018 ).…”

Section: Role Of Pgpr-based Biostimulants In Combating Abiotic Stressmentioning

confidence: 99%

“…Microbial application triggers various mechanisms for improving plant growth under salinity stress ( Sarkar et al., 2018 ). It generally includes the production of ACC-deaminase, EPS, phytohormones (auxin, CK and SA), antioxidant enzymes, VOCs, synthesis of osmoprotectant metabolites (proline, trehalose, alanine, glycine, glutamic acid, serine, threonine, aspartate, choline, betaine and organic acids), regulation of ion affinity transporters that in turn maintains ionic, osmotic, water homeostasis, thus resulting in improved plant growth under salt stress [ Figure 1A ; ( Tewari and Arora, 2018 ; Abbas et al., 2019 ; Kumar et al., 2019 ; Bhat et al., 2020 ; Sunita et al., 2020 ; Choudhary et al., 2022 ; Gamalero and Glick, 2022 ; Kumawat et al., 2022 )].…”

Section: Role Of Pgpr-based Biostimulants In Combating Abiotic Stressmentioning

confidence: 99%

“…PGPR based compounds modulate the phytohormones, antioxidants and osmolytes levels in plants for their growth under stress conditions ( Choudhary et al., 2022 ). A study demonstrated that under salt stress Rhodopseudomonas palustris G5 treated cucumber seedlings showed higher expression of SOD, POD, PPO and soluble sugars ( Ge and Zhang, 2019 ) compared to untreated plants.…”

Section: Role Of Pgpr-based Biostimulants In Combating Abiotic Stressmentioning

confidence: 99%

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Physiological and molecular insight of microbial biostimulants for sustainable agriculture

Kaushal

Ali

Saini³

et al. 2023

Front. Plant Sci.

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Increased food production to cater the need of growing population is one of the major global challenges. Currently, agro-productivity is under threat due to shrinking arable land, increased anthropogenic activities and changes in the climate leading to frequent flash floods, prolonged droughts and sudden fluctuation of temperature. Further, warm climatic conditions increase disease and pest incidences, ultimately reducing crop yield. Hence, collaborated global efforts are required to adopt environmentally safe and sustainable agro practices to boost crop growth and productivity. Biostimulants appear as a promising means to improve growth of plants even under stressful conditions. Among various categories of biostimulants, microbial biostimulants are composed of microorganisms such as plant growth-promoting rhizobacteria (PGPR) and/or microbes which stimulate nutrient uptake, produce secondary metabolites, siderophores, hormones and organic acids, participate in nitrogen fixation, imparts stress tolerance, enhance crop quality and yield when applied to the plants. Though numerous studies convincingly elucidate the positive effects of PGPR-based biostimulants on plants, yet information is meagre regarding the mechanism of action and the key signaling pathways (plant hormone modulations, expression of pathogenesis-related proteins, antioxidants, osmolytes etc.) triggered by these biostimulants in plants. Hence, the present review focuses on the molecular pathways activated by PGPR based biostimulants in plants facing abiotic and biotic challenges. The review also analyses the common mechanisms modulated by these biostimulants in plants to combat abiotic and biotic stresses. Further, the review highlights the traits that have been modified through transgenic approach leading to physiological responses akin to the application of PGPR in the target plants.

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“…Planting salt and alkali-resistant plants are excellent choice for the remediation of saline-alkali soils. It has been reported that phytoremediation strategies can be used to significantly increase microbial activity and restore soil fertility while decreasing the risk of saline-alkali soils ( Boyrahmadi and Raiesi, 2018 ; Luo et al, 2018 ; Choudhary et al, 2022 ). Microorganisms are an essential player in enhancing saline-alkali soils ( Yang and Sun, 2020 ; Liu et al, 2022 ).…”

Section: Introductionmentioning

confidence: 99%

Crop diversity promotes the recovery of fungal communities in saline-alkali areas of the Western Songnen Plain

Liu

Zhu

et al. 2023

Front. Microbiol.

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IntroductionPhytoremediation is an effective strategy for saline land restoration. In the Western Songnen Plain, northeast China, soil fungal community recovery for saline phytoremediation has not been well documented among different cropping patterns. In this study, we tested how rotation, mixture, and monoculture cropping patterns impact fungal communities in saline-alkali soils to assess the variability between cropping patterns.MethodsThe fungal communities of the soils of the different cropping types were determined using Illumina Miseq sequencing.ResultsMixture and rotation promoted an increase in operational taxonomic unit (OTU) richness, and OTU richness in the mixture system decreased with increasing soil depth. A principal coordinate analysis (PCoA) showed that cropping patterns and soil depths influenced the structure of fungal communities, which may be due to the impact of soil chemistry. This was reflected by soil total nitrogen (TN) and electrical conductivity (EC) being the key factors driving OTU richness, while soil available potassium (AK) and total phosphorus (TP) were significantly correlated with the relative abundance of fungal dominant genus. The relative abundance of Leptosphaerulina, Alternaria, Myrothecium, Gibberella, and Tetracladium varied significantly between cropping patterns, and Leptosphaerulina was significantly associated with soil chemistry. Soil depth caused significant differences in the relative abundance of Fusarium in rotation and mixture soils, with Fusarium more commonly active at 0–15 cm deep soil. Null-model analysis revealed that the fungal community assembly of the mixture soils in 0–15 cm deep soil was dominated by deterministic processes, unlike the other two cropping patterns. Furthermore, fungal symbiotic networks were more complex in rotation and mixture than in monoculture soils, reflected in more nodes, more module hubs, and connectors. The fungal networks in rotation and mixture soils were more stable than in monoculture soils, and mixture networks were obviously more connected than rotations. FUNGuild showed that the relative proportion of saprotroph in rotation and mixture was significantly higher than that in monocultures. The highest proportion of pathotroph and symbiotroph was exhibited in rotation and mixture soils, respectively.DiscussionOverall, mixture is superior to crop rotation and monocultures in restoring fungal communities of the saline-alkali soils of the Western Songnen Plain, northeast China.

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Plant Growth-Promoting Microbes: Role and Prospective in Amelioration of Salt Stress

Cited by 24 publications

References 129 publications

Tomato responses to salinity stress: From morphological traits to genetic changes

Tomato responses to salinity stress: From morphological traits to genetic changes

Physiological and molecular insight of microbial biostimulants for sustainable agriculture

Crop diversity promotes the recovery of fungal communities in saline-alkali areas of the Western Songnen Plain

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