Amelioration of salinity stress in different basil (Ocimum basilicumL.) varieties by vesicular-arbuscular mycorrhizal fungi

Elhindi, Khalid M.; El-Din, Ahmed Sharaf; Abdel-Salam, Eslam M.; Elgorban, Abdallah M.

doi:10.1080/09064710.2016.1204467

Cited by 9 publications

(9 citation statements)

References 35 publications

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“…Under stress conditions, plants can balance the osmotic pressure by the accumulation of soluble sugars in the cells [45]. In our study, soluble sugars significantly decreased under salinity stress, which was in agreement with previous studies on basil cultivars [46]. Accumulation and production of osmolytes by PGPR are being conducted by mechanisms that protect the plant against salinity stress [47].…”

Section: Discussionsupporting

confidence: 92%

The Effects of Halomonas sp. and Azotobacter sp. on Ameliorating the Adverse Effect of Salinity in Purple Basil (Ocimum basilicum L.)

Salimi¹,

Etemadi²,

Eshghi³

et al. 2021

Preprint

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The role of plant growth-promoting rhizobacteria (PGPR) on enhancing tolerance of plants to abiotic stresses is well reported, but the effects of RGPRs on plants under salinity stress are not widely studied in the literature. Our study aimed to investigate the effect of Halomonas sp. and Azotobacter sp. on antioxidant activity, secondary metabolites, and biochemicals changes of purple basil under salinity stress conditions. The applied salt concentrations in this study were 50, 100, and 150 mM sodium chloride (NaCl). Salinity stress had a negative effect on plant growth parameters. Moreover, a reduction in some of the osmolytes and oxidative stress markers was observed. Inoculated plants ameliorated the oxidative damage by reducing the hydrogen peroxide (H2O2) contents and by increasing osmolytes (proline, total proteins, and soluble sugars), antioxidant enzymes activities (catalase, ascorbate peroxidase) and secondary metabolites (flavonoids). Overall, among treatments, plants inoculated with Azotobacter showed a better impact on physiological attributes to alleviate the adverse effects of 150 mM NaCl salinity stress on basil growth.

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Section: Discussionsupporting

confidence: 92%

The Effects of Halomonas sp. and Azotobacter sp. on Ameliorating the Adverse Effect of Salinity in Purple Basil (Ocimum basilicum L.)

Salimi¹,

Etemadi²,

Eshghi³

et al. 2021

Preprint

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“…Basil ( Ocimum basilicum L.) is an important warm-season MAP with high potential to be integrated into a wealth of cropping systems [ 14 , 15 ]. The salinity tolerance of basil is considered low [ 16 ], and the variability of the responses depends on numerous factors that include the genotype, the growing medium and conditions, including the presence in the soil of microbes with either pathogenic or beneficial activity [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. Such responses are multidimensional because they affect main parameters of economic importance, such as the leaf fraction on the total above-ground biomass, and the concentration and composition of secondary compounds, including the volatile organic fractions and the essential oil [ 14 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

An Endophytic Fungi-Based Biostimulant Modulates Volatile and Non-Volatile Secondary Metabolites and Yield of Greenhouse Basil (Ocimum basilicum L.) through Variable Mechanisms Dependent on Salinity Stress Level

et al. 2021

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Salinity in water and soil is one of the major environmental factors limiting the productivity of agronomic and horticultural crops. In basil (Ocimum basilicum L., Lamiaceae) and other Ocimum species, information on the plant response to mild salinity levels, often induced by the irrigation or fertigation systems, is scarce. In the present work, we tested the effectiveness of a microbial-based biostimulant containing two strains of arbuscular mycorrhiza fungi (AMF) and Trichoderma koningii in sustaining greenhouse basil yield traits, subjected to two mild salinity stresses (25 mM [low] and 50 mM [high] modulated by augmenting the fertigation osmotic potential with NaCl) compared to a non-stressed control. The impact of salinity stress was further appraised in terms of plant physiology, morphological ontogenesis and composition in polyphenols and volatile organic compounds (VOC). As expected, increasing the salinity of the solution strongly depressed the plant yield, nutrient uptake and concentration, reduced photosynthetic activity and leaf water potential, increased the Na and Cl and induced the accumulation of polyphenols. In addition, it decreased the concentration of Eucalyptol and β-Linalool, two of its main essential oil constituents. Irrespective of the salinity stress level, the multispecies inoculum strongly benefited plant growth, leaf number and area, and the accumulation of Ca, Mg, B, p-coumaric and chicoric acids, while it reduced nitrate and Cl concentrations in the shoots and affected the concentration of some minor VOC constituents. The benefits derived from the inoculum in term of yield and quality harnessed different mechanisms depending on the degree of stress. under low-stress conditions, the inoculum directly stimulated the photosynthetic activity after an increase of the Fe and Mn availability for the plants and induced the accumulation of caffeic and rosmarinic acids. under high stress conditions, the inoculum mostly acted directly on the sequestration of Na and the increase of P availability for the plant, moreover it stimulated the accumulation of polyphenols, especially of ferulic and chicoric acids and quercetin-rutinoside in the shoots. Notably, the inoculum did not affect the VOC composition, thus suggesting that its activity did not interact with the essential oil biosynthesis. These results clearly indicate that beneficial inocula constitute a valuable tool for sustaining yield and improving or sustaining quality under suboptimal water quality conditions imposing low salinity stress on horticultural crops.

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“…At a salinity level of 90 mM NaCl, however, the origin of the inoculum did not matter. Possibly, an excess salinity of the soil suppresses the facilitative effect of soil microbes on plants (Rath and Rousk 2015;Elhindi et al 2016). Potentially, the latter would not have been the case if we would have used soil from a saline field site as initial substrate, as such soil would have contained microbes adapted to high salinity.…”

Section: Discussionmentioning

confidence: 99%

Salinity-induced changes in the rhizosphere microbiome improve salt tolerance of Hibiscus hamabo

et al. 2019

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Aims We aimed to assess whether soil salinity changes the microbial community in the rhizosphere of Hibiscus hamabo, and whether these changes in the microbiome feedback on the growth of H. hamabo. Methods To test effects of salinity on the rhizosphere microbiome, we first did a greenhouse experiment in which H. hamabo was grown in pots with a sand-soil mixture at different salt concentrations (0, 15, 40 and 90 mM NaCl). Then in another two experiments, we tested effects of the rhizosphere microbiomes on performance of H. hamabo plants by sowing and growing them in pots with a peat-sand-vermiculite mixture inoculated with either soil or root fragments collected from the different salinity treatments (0, 40 and 90 mM NaCl) of the first experiment and crossed with a salinity treatment (0, 40 and 90 mM NaCl). Results The bacterial rhizosphere community of H. hamabo was less affected by soil salinities than the fungal community was. Germination and biomass of H. hamabo were highest at a salinity of 40 mM NaCl, and higher in the presence than in the absence of microbial inoculums. Moreover, H. hamabo performed best when the microbial inocula came from the same salinity level, particularly at a salinity of 40 mM NaCl. Conclusions Our study provides evidence that salinityinduced changes in rhizosphere microbial communities tend to promote germination and growth of H. hamabo at the respective salinities.

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Amelioration of salinity stress in different basil (Ocimum basilicumL.) varieties by vesicular-arbuscular mycorrhizal fungi

Cited by 9 publications

References 35 publications

The Effects of <em>Halomonas </em>sp. and <em>Azotobacter </em>sp. on Ameliorating the Adverse Effect of Salinity in Purple Basil (<em>Ocimum basilicum</em> L.)

The Effects of <em>Halomonas </em>sp. and <em>Azotobacter </em>sp. on Ameliorating the Adverse Effect of Salinity in Purple Basil (<em>Ocimum basilicum</em> L.)

An Endophytic Fungi-Based Biostimulant Modulates Volatile and Non-Volatile Secondary Metabolites and Yield of Greenhouse Basil (Ocimum basilicum L.) through Variable Mechanisms Dependent on Salinity Stress Level

Salinity-induced changes in the rhizosphere microbiome improve salt tolerance of Hibiscus hamabo

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