Plant growth promoting rhizobacteria (PGPR) confer drought resistance and stimulate biosynthesis of secondary metabolites in pennyroyal (Mentha pulegium L.) under water shortage condition

2020 ◽  
Vol 263 ◽  
pp. 109132 ◽  
Author(s):  
Behvar Asghari ◽  
Raheleh Khademian ◽  
Behnam Sedaghati
Keyword(s):  
Secondary Metabolites ◽  
Plant Growth ◽  
Drought Resistance ◽  
Plant Growth Promoting Rhizobacteria ◽  
Water Shortage ◽  
Mentha Pulegium ◽  
Plant Growth Promoting ◽  
Growth Promoting

scholarly journals Anti-fungal secondary metabolites and hydrolytic enzymes from rhizospheric bacteria in crop protection: a review

2021 ◽  
Vol 44 (2) ◽  
pp. 69-84
Author(s):  
Farhana Tasnim Chowdhury ◽  
Nazia Rifat Zaman ◽  
Mohammad Riazul Islam ◽  
Haseena Khan
Keyword(s):  
Secondary Metabolites ◽  
Plant Growth ◽  
Fungal Pathogens ◽  
Hydrolytic Enzymes ◽  
Plant Growth Promoting Rhizobacteria ◽  
Field Conditions ◽  
Plant Host ◽  
Wide Range ◽  
Plant Growth Promoting ◽  
Growth Promoting

Plant growth promoting rhizobacteria (PGPR) residing in soil rhizosphere provide enormous beneficial effects to a plant host producing diverse secondary metabolites and enzymes useful for plant growth and protection. Siderophores, antibiotics, volatile compounds and hydrolytic enzymes are the major molecules secreted by the PGPRs, which have substantial antifungal properties and can provide plant protection. These compounds are responsible for the lysis and hyperparasitism of antagonists against deleterious fungal pathogens. Siderophore-producing PGPRs function by depriving the pathogen of iron nutrition. Antibiotics have been reported to be involved in the suppression of different fungal pathogens by inducing fungistasis, inhibition of spore germination, lysis of fungal mycelia. The PGPRs also secrete a wide range of low molecular weight volatile organic compounds (VOCs) that inhibit mycelial growth, sporulation, germination of phytophathogenic fungi, etc. Hydrolytic enzymes, mostly chitinase, protease and cellulose, lyse the cell wall of fungi. Therefore, plant growth-promoting rhizobacteria can be considered as an effective, eco-friendly, and sustainable replacement to the chemical fungicides. There are many PGPRs that perform very well in controlled conditions but not in field conditions, and hence the commercializing of hese products is not easy.  Development of formulations with increased shelf life, a broad spectrum of action and consistent performance under field conditions can pave the way for commercializing the PGPRs at a faster rate. Journal of Bangladesh Academy of Sciences, Vol. 44, No. 2, 69-84, 2020

scholarly journals Isolation and screening of Azotobacter Spp. for plant growth promoting properties and its survival under different environmental stress conditions

2020 ◽  
Vol 10 (2) ◽  
pp. 5188-5192
Keyword(s):  
Plant Growth ◽  
Phosphate Solubilization ◽  
Plant Growth Promoting Rhizobacteria ◽  
Soil Condition ◽  
Water Shortage ◽  
Stress Conditions ◽  
Soil Productivity ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Agricultural Yield

Because of detrimental changes in the soil condition, the substitution of chemical fertilizer is essential. Quite a lot of alternatives are available to improve the soil productivity now a day such as biofertilizers. Plant growth promoting rhizobacterias (PGPR) is being used as efficient biofertilizers known to influence plant growth by direct or indirect methods. Seeking competent PGPR strains with diverse activities, a total of six Azotobacter were isolated from Orissa University of Agriculture and Technology (OUAT) rice field of Odisha. All these test isolates were screened on the basis of morphological and biochemical characteristics. The result reveals that all isolates are gram negative small rods in shape; all were positive for catalase and oxidase but negative for starch and gelatine hydrolysis. Isolates were then screened for their plant growth promoting properties such as production of indoleacetic acid (IAA), nitrate reduction, ammonia (NH3), phosphate solubilization and antifungal activity. All isolates show IAA, nitrate and phosphate solubilization positive. One of the major constraints on agricultural yield is drought and this circumstance is likely to be intensified in the future due to water shortage worldwide. A number of mitigation approaches and alterations are involved to survive drought stress. Plant growth-promoting rhizobacteria (PGPR) could play a major role in decreasing different stress conditions in plants. From an overall study of six isolates A4 isolate shows significant PGPR and drought tolerant properties.

scholarly journals PGPR Modulation of Secondary Metabolites in Tomato Infested with Spodoptera litura

Agronomy ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 778 ◽  
Author(s):  
Bani Kousar ◽  
Asghari Bano ◽  
Naeem Khan
Keyword(s):  
Secondary Metabolites ◽  
Plant Growth ◽  
Spodoptera Litura ◽  
High Performance ◽  
Plant Growth Promoting Rhizobacteria ◽  
Growth And Yield ◽  
Infected Leaf ◽  
Tomato Plants ◽  
Plant Growth Promoting ◽  
Growth Promoting

The preceding climate change demonstrates overwintering of pathogens that lead to increased incidence of insects and pest attack. Integration of ecological and physiological/molecular approaches are imperative to encounter pathogen attack in order to enhance crop yield. The present study aimed to evaluate the effects of two plant growth promoting rhizobacteria (Bacillus endophyticus and Pseudomonas aeruginosa) on the plant physiology and production of the secondary metabolites in tomato plants infested with Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae). The surface sterilized seeds of tomato were inoculated with plant growth promoting rhizobacteria (PGPR) for 3–4 h prior to sowing. Tomato leaves at 6 to 7 branching stage were infested with S. litura at the larval stage of 2nd instar. Identification of secondary metabolites and phytohormones were made from tomato leaves using thin-layer chromatography (TLC) and high performance liquid chromatography (HPLC) and fourier-transform infrared spectroscopy (FTIR). Infestation with S. litura significantly decreased plant growth and yield. The PGPR inoculations alleviated the adverse effects of insect infestation on plant growth and fruit yield. An increased level of protein, proline and sugar contents and enhanced activity of superoxide dismutase (SOD) was noticed in infected tomato plants associated with PGPR. Moreover, p-kaempferol, rutin, caffeic acid, p-coumaric acid and flavonoid glycoside were also detected in PGPR inoculated infested plants. The FTIR spectra of the infected leaf samples pre-treated with PGPR revealed the presence of aldehyde. Additionally, significant amounts of indole-3-acetic acid (IAA), salicylic acid (SA) and abscisic acid (ABA) were detected in the leaf samples. From the present results, we conclude that PGPR can promote growth and yield of tomatoes under attack and help the host plant to combat infestation via modulation in IAA, SA, ABA and other secondary metabolites.

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