Growth-promoting bacteria alleviates drought stress of <i>G. uralensis</i> through improving photosynthesis characteristics and water status

Zhang, Wenjin; Xie, Zhicai; Zhang, Xiaojia; Lang, Duoyong; Zhang, Xinhui

doi:10.1080/17429145.2019.1680752

Cited by 45 publications

(38 citation statements)

References 63 publications

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“…Drought leads to a decrease in both photosynthetic pigment content and photosynthetic efficiency of plants resulting from decreased leaf area, plant height, biomass accumulation, and yield formation. The content of the main photosynthetic pigments chlorophylls (Chl) and carotenoids (Car), while indirect, is the most important biochemical indicator of plant photosynthetic activity [ 42 , 43 , 44 ]. Many studies have shown that bacterial inoculation may positively influence the maintenance of photosynthetic pigments in plants accompanied by improved drought tolerance [ 42 , 45 , 46 ].…”

Section: Discussionmentioning

confidence: 99%

“…The content of the main photosynthetic pigments chlorophylls (Chl) and carotenoids (Car), while indirect, is the most important biochemical indicator of plant photosynthetic activity [ 42 , 43 , 44 ]. Many studies have shown that bacterial inoculation may positively influence the maintenance of photosynthetic pigments in plants accompanied by improved drought tolerance [ 42 , 45 , 46 ]. B. pumilus alleviated drought-induced damage to the photosynthetic activity of Glycyrrhiza uralensis [ 42 ].…”

Section: Discussionmentioning

confidence: 99%

“…Many studies have shown that bacterial inoculation may positively influence the maintenance of photosynthetic pigments in plants accompanied by improved drought tolerance [ 42 , 45 , 46 ]. B. pumilus alleviated drought-induced damage to the photosynthetic activity of Glycyrrhiza uralensis [ 42 ]. In our study of both DT and DS wheat cultivars, a decrease in the Chl a, Chl b, and Car was observed in response to drought stress ( Figure 4 ).…”

Section: Discussionmentioning

confidence: 99%

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Seed Priming with Endophytic Bacillus subtilis Modulates Physiological Responses of Two Different Triticum aestivum L. Cultivars under Drought Stress

Lastochkina

Garshina

Ivanov

et al. 2020

Plants

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The protective effects against drought stress of the endophytic bacterium Bacillus subtilis 10-4 were measured by studying the priming response in two wheat (Triticum aestivum L.)—Ekada70 (E70) and Salavat Yulaev (SY)—lines, tolerant and susceptible to drought, respectively. B. subtilis 10-4 improved germination and growth parameters under normal conditions in both cultivars with the most pronounced effect observed in cv. E70. Under drought conditions, B. subtilis 10-4 significantly ameliorated the negative impact of stress on germination and growth of cv. E70, but had no protective effect on cv. SY. B. subtilis 10-4 induced an increase in the levels of photosynthetic chlorophyll (Chl) a, Chl b, and carotenoids (Car) in the leaves of cv. E70, both under normal and drought conditions. In cv. SY plants, bacterial inoculation decreased the contents of Chl a, Chl b, and Car under normal conditions, but pigment content were almost recovered under drought stress. B. subtilis 10-4 increased water holding capacity (WHC) of cv. E70 (but did not affect this parameter in cv. SY) and prevented the stress-induced decline in WHC in both cultivars. Notably, B. subtilis 10-4 increased endogenous salicylic acid (SA) concentration in both cultivars, especially in cv. E70. Moreover, B. subtilis 10-4 reduced drought-induced endogenous SA accumulation, which was correlated with the influence of endophyte on growth, indicating a possible involvement of endogenous SA in the implementation of B. subtilis-mediated effects in both cultivars. Overall, B. subtilis 10-4 inoculation was found to increase drought tolerance in seedlings of both cultivars, as evidenced by decreased lipid peroxidation, proline content, and electrolyte leakage from tissues of wheat seedlings primed with B. subtilis 10-4 under drought conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Seed Priming with Endophytic Bacillus subtilis Modulates Physiological Responses of Two Different Triticum aestivum L. Cultivars under Drought Stress

Lastochkina

Garshina

Ivanov

et al. 2020

Plants

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“…PGPR also increase the absorption of the elements involved in the creation of structure of the Chl molecule and result in Chl concentration (Dutta and Khurana 2015;Ngumbi and Kloepper 2016;Parray et al 2016;Ruzzi and Aroca 2015). It is also possible that under stress conditions, the PGPR prevent the destruction of Chl molecules to some extent, through stimulation of genes involved in the protection against photo-oxidative stress (Zhang et al 2019).…”

Section: Discussionmentioning

confidence: 99%

Morpho-Physiological and Biochemical Attributes of Tall Fescue (Festuca arundinacea Schreb.) Inoculated with Pseudomonas fluorescens under Deficit Irrigation

Mahdavi

Salehi

Zarei

2020

J Soil Sci Plant Nutr

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Urban green spaces are a form of land use that often require intensive maintenance and have social and ecological functions. Due to global water scarcity, management strategies regarding planting and maintenance vegetation, especially turfgrass, are changing in many countries. Tall fescue serves as one of the most important and commonly used cool-season turfgrass species and is considered to be drought tolerant. Plant growth-promoting rhizobacteria (PGPR), as bio-fertilizers, are also crucial in terms of decreasing and improving harmful effects of abiotic stresses in plants. This research considers inoculation with PGPR in turfgrass for the purpose of improving drought tolerance and reducing water consumption. This work was conducted over two consecutive years to study the effects of Pseudomonas fluorescens on two cultivars of tall fescue ('H-d' and 'J-r') with three irrigation intervals (7, 14, and 21 days) under greenhouse and outdoor conditions. Results showed that irrigating less frequently caused a reduction in tall fescue turf quality, fresh weight, chlorophyll content, relative water content, and phosphorus content. In most cases, the quantity of compatible solutes (proline and glycine betaine) and antioxidant enzymes (superoxide dismutase and peroxidase) was increased; however, the rate of change was enhanced in turfgrass treated with PGPR. Quantitative and qualitative characteristics of turfgrass in greenhouse experiment were substantially superior in comparison with outdoor condition. This research is novel, as it is the first quantitative and qualitative study to the best of our knowledge exploring the effect of PGPR on turfgrass biomass. The level of amino acids, the activity rate of antioxidant enzymes, and the bacterium effects on turfgrass have been considered, both under greenhouse conditions and outdoor environment. This research provides a methodology to investigate various beneficial bacteria on turfgrass for the purpose of developing better management programs under stress conditions.

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“…Licorice adapts very well to low-fertility soils and drought. In fact, it has been used in the ecological restoration of arid regions [22]. In its natural habitats, the licorice rhizosphere harbors actinobacteria, rhizobia, other soil bacteria, AM, and DSE with plant growth-promoting activity [23,24].…”

Section: Introductionmentioning

confidence: 99%

Variation of soil microbiome in licorice rhizosphere driven with inoculating dark septate endophytes under drought stress

He¹,

Wang²,

Hou³

et al. 2020

Preprint

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BackgroundDark septate endophytes (DSE) are facultative biotrophic ascomycetes that colonize plant roots either alone or with arbuscular mycorrhizal (AM) fungi. DSE may provide nutrients to their plant hosts and help them adapt to various abiotic and biotic stresses. DSE inoculation under drought stress increased the biomass, root exudates, and AM fungi in the licorice (Glycyrrhiza uralensis Fisch.) rhizosphere. We conducted a pot experiment to establish whether the responses of licorice to DSE inoculation under drought stress are caused by changes in the rhizosphere microbiome. Each pot was inoculated with either Acrocalymma vagum or Paraboeremia putaminum. One set of pots was inoculated with a sterile culture medium. All three DSE-treated and uninoculated pots were subjected either to a well-watered (70% field water capacity, FWC) or drought stress (30% FWC) water regime. Rhizosphere microbiome compositions were measured by Illumina MiSeq sequencing of the 16S and ITS2 rRNA genes.ResultsIn total, 1,278 fungal and 1,583 bacterial operational taxonomic units (OUTs) were obtained at a 97% sequence similarity level. Ascomycota were the predominant fungi and Proteobacteria, Actinobacteria, Chloroflexi and Firmicutes were the predominant bacteria. DSE inoculation and water regime significantly influenced the rhizosphere microbiome composition. However, the effects of DSE on the fungal community were greater than those on the bacterial community. Paraboeremia putaminum exerted a stronger impact on the licorice rhizosphere microbiome than Acrocalymma vagum under drought stress. The observed changes in edaphic factors (water condition, soil organic matter, available N, available P, and available K) caused by DSE inoculation could be explained by the variations in rhizosphere microbiome composition. A network analysis indicated that DSE inoculation augmented the relative abundance of beneficial symbiotrophic fungi and growth-promoting bacteria but diminished the relative abundance of pathogens in the licorice rhizosphere.ConclusionsThe present study showed that the licorice rhizosphere microbial community differed between the DSE-inoculated and uninoculated plants. DSE had a stronger influence on the fungal than on the bacterial rhizosphere community under drought stress. These give us the guidance to develop biofertilizers with DSE consortia to enhance the cultivation of medicinal plants by shaping soil microbial community structure in dryland agriculture.

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Growth-promoting bacteria alleviates drought stress of G. uralensis through improving photosynthesis characteristics and water status

Abstract: View related articles View Crossmark data Citing articles: 1 View citing articles Growth-promoting bacteria alleviates drought stress of G. uralensis through improving photosynthesis characteristics and water status

Cited by 45 publications

References 63 publications

Seed Priming with Endophytic Bacillus subtilis Modulates Physiological Responses of Two Different Triticum aestivum L. Cultivars under Drought Stress

Seed Priming with Endophytic Bacillus subtilis Modulates Physiological Responses of Two Different Triticum aestivum L. Cultivars under Drought Stress

Morpho-Physiological and Biochemical Attributes of Tall Fescue (Festuca arundinacea Schreb.) Inoculated with Pseudomonas fluorescens under Deficit Irrigation

Variation of soil microbiome in licorice rhizosphere driven with inoculating dark septate endophytes under drought stress

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