The Good, the Bad, and the Ugly of Rhizosphere Microbiome

Ali, Muhammad Amjad; Naveed, Muhammad; Mustafa, Adnan; Abbas, Amjad

doi:10.1007/978-981-10-3473-2_11

Cited by 58 publications

(55 citation statements)

References 214 publications

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“…Moreover, bacterial inoculation can have a positive effect on plant physiology through uplifting chlorophyll contents, stomatal conductance, internal CO 2 concentration and relative water contents [31,[64][65][66][67]. Certain PGPB have been recognized in imparting salinity resistance through direct stimulation of crops by providing fixed N, Fe sequestered by bacterial cells, phytohormones and soluble phosphates [11,68,69].…”

Section: Plant Physiological and Biochemical Attributesmentioning

confidence: 99%

“…Previously, it was reported that inoculation of PGPR can facilitate uptake of micronutrients and increase plant tolerance against stress [83][84][85]. Moreover, Plant growth-promoting bacteria (PGPB) can mobilize the nutrients through various mechanism such as production of organic acids, rhizospheric acidification, nutrients chelation and by multiple exchange reactions [11,86]. It has been reported that PsJN is well-known PGPB, having many functional traits for plant growth promotion, nutrient uptake, and stress tolerance.…”

Section: Nutrients Homeostasismentioning

confidence: 99%

“…PGPB-based iron supply appeared to be more effective in iron-limited soils, where high pH and salinity reduce Fe availability to crop plants [8]. Under stress conditions, PGPB releases an enzyme 1-aminocyclopropane-1-carboxylic acid (ACC)-deaminase, which can mitigate the negative effect of salinity on root growth by lowering the ethylene concentration in the plants [9][10][11][12]. PGPB strain Burkholderia phytofirmans PsJN is well known to promote plant growth by improving essential nutrient uptakes like phosphorus, iron, and zinc or by releasing other plant growth regulators like ACC-deaminase and indole acetic acid [13].…”

Section: Introductionmentioning

confidence: 99%

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Alleviation of Salinity Induced Oxidative Stress in Chenopodium quinoa by Fe Biofortification and Biochar—Endophyte Interaction

et al. 2020

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Iron-biofortification is a sustainable food-based approach to combat iron deficiency by increasing iron content and bioavailability in agronomic crops. Siderophore producing microbes offer a sustainable and low-cost way to increase iron supply in crops. Also, certain substances released from organic amendments act as iron-chelators which increase the solubility as well as the availability of iron to plants. Present study investigated the role of siderophore-producing endophytic bacteria and biochar on iron-fortification of a novel crop quinoa in iron-limited saline conditions. The surface-disinfected seeds of quinoa were inoculated with Burkholderia phytofirmans PsJN (CFU = 109) and sown in saline soil (EC 20 dS m−1) amended with biochar (1% w/w). Results revealed that biochar and PsJN particularly when applied together significantly enhanced plant growth, grain yield, and grain nutrient contents of quinoa. Strikingly, iron concentration in quinoa grains was increased up to 71% by the combined application of biochar and PsJN. Moreover, plant physiological parameters were also improved significantly by the integrated application. However, enzymatic/non-enzymatic antioxidants activities were decreased by integrated treatment thus ameliorated salinity stress. Our study suggests that integrated application of siderophore-producing bacteria and biochar could be a promising, sustainable and cost-effective strategy which is easily integratable into the existing farming practices to achieve food fortification with micronutrients in developing countries.

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Section: Plant Physiological and Biochemical Attributesmentioning

confidence: 99%

Section: Nutrients Homeostasismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Alleviation of Salinity Induced Oxidative Stress in Chenopodium quinoa by Fe Biofortification and Biochar—Endophyte Interaction

et al. 2020

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“…Plants are able to shape their rhizospheric and endophytic microbiome and can maintain environmental stress resistant bacterial communities having specific beneficial characteristics [9,10]. Bacterial endophytes have been found almost in every analysed plant species while, endophytic free plants are less able to cope with environmental stress conditions [11].…”

Section: Introductionmentioning

confidence: 99%

Appraising Endophyte–Plant Symbiosis for Improved Growth, Nodulation, Nitrogen Fixation and Abiotic Stress Tolerance: An Experimental Investigation with Chickpea (Cicer arietinum L.)

et al. 2019

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Chickpea is an important leguminous crop that improves soil fertility through atmospheric nitrogen fixation with the help of rhizobia present in nodules. Non-rhizobia endophytes are also capable of inducing nodulation and nitrogen fixation in leguminous crops. The aim of the current study was to isolate, characterize and identify the non-rhizobia endophytic bacterial strains from root nodules of chickpea. For this purpose, more than one hundred isolates were isolated from chickpea root nodules under aseptic conditions and were confirmed as endophytes through re-isolating them from root nodules of chickpea after their inoculation. Nineteen confirmed endophytic bacterial strains revealed significant production of indole acetic acid (IAA) both in presence and absence of L-tryptophan and showed their ability to grow under salt, pH and heavy metal stresses. These strains were evaluated for in vitro plant growth promoting (PGP) traits and results revealed that seven strains showed solubilization of P and colloidal chitin along with possessing catalase, oxidase, urease and chitinase activities. Seven P-solubilizing strains were further evaluated in a jar trial to explore their potential for promoting plant growth and induction of nodulation in chickpea roots. Two endophytic strains identified as Paenibacillus polymyxa ANM59 and Paenibacillus sp. ANM76 through partial sequencing of the 16S rRNA gene showed the maximum potential during in vitro PGP activities and improved plant growth and nodulation in chickpea under the jar trial. Use of these endophytic strains as a potential biofertilizer can help to reduce the dependence on chemical fertilizers while improving crop growth and soil health simultaneously.

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“…Changes in microorganism populations in soils are critical to the sustainability of soil-based ecosystem functions [2]. Soil-borne pathogens and nematode infestations cause significant yield losses and lower the quality of horticultural crops worldwide [3]. Among the most familiar soil-borne diseases, Fusarium wilt is particularly challenging because of its complexity and long survival time in soil [4].…”

Section: Introductionmentioning

confidence: 99%

Variations in Growth, Physiology, and Antioxidative Defense Responses of Two Tomato (Solanum lycopersicum L.) Cultivars after Co-Infection of Fusarium oxysporum and Meloidogyne incognita

Maqsood

Kamran

et al. 2020

Agronomy

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The soil-borne fungus Fusarium oxysporum (Fo) and the nematode Meloidogyne incognita (Mi) are destructive pathogens that cause substantial yield losses to tomato (Solanum lycopersicum L.) crops worldwide. The present study sought to elucidate the physiological, biochemical, and cytological responses of tomato cultivars (Gailing maofen 802 and Zhongza 09) by root invasion of Fo (1 × 105 CFUmL−1) and Mi (1500 second-stage juveniles (J2) alone and in combination after 14 days. Results revealed that combined inoculation of Fo and Mi significantly increased disease intensity, electrolyte leakage, and hydrogen peroxide and malondialdehyde contents; and decreased photosynthetic capacity and enzyme activity in both cultivars as compared to their solo inoculation. Increasing the disease intensity reduced the maximum morphological traits, such as shoot length, total dry weight, and total chlorophyll contents, in G. maofen 802 (by 32%, 54.2%, and 52.3%, respectively) and Zhongza 09 (by 18%, 32%, and 21%, respectively) as compared to the control. Others factors were also reduced in G. maofen 802 and Zhongza 09, such as photosynthetic capacity (by 70% and 57%, respectively), stomatal conductance (by 86% and 70%, respectively), photochemical quantum yield of photosystem II (YII) (by 36.6% and 29%, respectively), and electron transport rate (by 17.7% and 10%, respectively), after combined inoculation of Fo and Mi. Furthermore, the combined infestation of Fo and Mi resulted in reduced activity of plant-defense-related antioxidants in G. maofen 802 compared with their single application or control. However, these antioxidants were highly up-regulated in Zhongza 09 (by 59%–93%), revealing the induction of tolerance against studied pathogens. The transmission electron microscopy (TEM) results further demonstrated that root cells of Zhongza 09 had unique tetrahedral crystal-like structures in the membrane close to mitochondria under all treatments except control. Therefore, it is concluded that Mi caused severe root damage, suppressed plant growth, depleted antioxidants, and caused high generation of ROS in the presence of Fo as compared to its solo inoculation. Tolerant cultivars adopted different mechanistic strategies at the structural and cellular levels to tolerate the Mi and Fo stresses.

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The Good, the Bad, and the Ugly of Rhizosphere Microbiome

Cited by 58 publications

References 214 publications

Alleviation of Salinity Induced Oxidative Stress in Chenopodium quinoa by Fe Biofortification and Biochar—Endophyte Interaction

Alleviation of Salinity Induced Oxidative Stress in Chenopodium quinoa by Fe Biofortification and Biochar—Endophyte Interaction

Appraising Endophyte–Plant Symbiosis for Improved Growth, Nodulation, Nitrogen Fixation and Abiotic Stress Tolerance: An Experimental Investigation with Chickpea (Cicer arietinum L.)

Variations in Growth, Physiology, and Antioxidative Defense Responses of Two Tomato (Solanum lycopersicum L.) Cultivars after Co-Infection of Fusarium oxysporum and Meloidogyne incognita

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