Impacts of plant growth promoters and plant growth regulators on rainfed agriculture

Khan, Naeem; Bano, Asghari; Babar, Ali

doi:10.1371/journal.pone.0231426

Cited by 85 publications

(82 citation statements)

References 95 publications

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“…The proteins include aquaporins, heat shock proteins, and late embryogenesis abundant proteins, whereas the amino acids include proline and glycine betaine [52]. Khan et al [53] indicated that foliar spray of Bacillus subtilis, Bacillus thuringiensis, and B. megaterium in pot experiment enhanced the leaf protein and sugar content in drought-sensitive chickpea plants under moisture stress.…”

Section: F I G U R Ementioning

confidence: 99%

Mitigation of drought stress in rice crop with plant growth‐promoting abiotic stress‐tolerant rice phyllosphere bacteria

Sabarinathan

Gomathy

et al. 2020

J Basic Microbiol

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In the search of effective drought‐alleviating and growth‐promoting phyllosphere bacteria, a total of 44 bacterial isolates were isolated from the leaf surface of drought‐tolerant rice varieties, Mattaikar, Nootripattu, Anna R(4), and PMK3, and screened for their abiotic stress tolerance by subjecting their growth medium to temperature, salinity, and osmotic stress. Only eight isolates were found to grow and proliferate under different abiotic stress conditions. These isolates were identified using 16S ribosomal DNA gene sequence and submitted to the NCBI database. All the bacterial isolates were identified as Bacillus sp., except PB24, which was identified as Staphylococcus sp., and these isolates were further screened for plant growth‐promoting (PGP) traits such as IAA production, GA production, ACC deaminase activity, and exopolysaccharide production under three different osmotic stress conditions adjusted using polyethylene glycol (PEG 6000). Additionally, mineral solubilization was measured under the normal condition. Bacillus endophyticus PB3, Bacillus altitudinis PB46, and Bacillus megaterium PB50 were found to have multifarious PGP traits. Consecutively, the performance of an individual strain to improve the plant growth was investigated under the osmotic stress (25% PEG 6000) and nonstress condition by inoculating them into rice seeds using hydroponics culture. Furthermore, the drought‐alleviating potency of bacterial strains was assessed in the rice plants using pot experiment (−1.2 MPa) through bacterial foliar application during the reproductive stage. Finally, as a result of seed inoculation and foliar spray, the application of B. megaterium PB50 significantly improved the plant growth under osmotic stress, protected plants from physical drought through stomatal closure, and improved carotenoid, total soluble sugars, and total protein content. Metabolites of PB50 were profiled under both stress and nonstress conditions using gas chromatography–mass spectroscopy.

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Section: F I G U R Ementioning

confidence: 99%

Mitigation of drought stress in rice crop with plant growth‐promoting abiotic stress‐tolerant rice phyllosphere bacteria

Sabarinathan

Gomathy

et al. 2020

J Basic Microbiol

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“…Under stress conditions, PGPR can improve the injurious impacts and enhance the yield production under salt conditions [45], as a bio-fertilizer in sugar beet and sweet sorghum plants [20,46,47] and as a bio-control agent [48][49][50]. There are many PGPR strains, such as Bacillus, Azotobacter, Azospirillum, Pseudomonas, Rhizobium, and Serratia, which can be used in improving plant growth even under various stress factors [51,52] by the production of antioxidants, phytohormones and vitamins [53]. There is a lot of information about the effect of PGPR, nevertheless studies about chitosan and its effects on plants under salinity stress are still scarce and have not yet been fully understood.…”

Section: Introductionmentioning

confidence: 99%

Chlorophyll Fluorescence Parameters and Antioxidant Defense System Can Display Salt Tolerance of Salt Acclimated Sweet Pepper Plants Treated with Chitosan and Plant Growth Promoting Rhizobacteria

et al. 2020

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Salinity stress deleteriously affects the growth and yield of many plants. Plant growth promoting rhizobacteria (PGPR) and chitosan both play an important role in combating salinity stress and improving plant growth under adverse environmental conditions. The present study aimed to evaluate the impacts of PGPR and chitosan on the growth of sweet pepper plant grown under different salinity regimes. For this purpose, two pot experiments were conducted in 2019 and 2020 to evaluate the role of PGPR (Bacillus thuringiensis MH161336 106–8 CFU/cm3) applied as seed treatment and foliar application of chitosan (30 mg dm−3) on sweet pepper plants (cv. Yolo Wonder) under two salinity concentrations (34 and 68 mM). Our findings revealed that, the chlorophyll fluorescence parameter (Fv/Fm ratio), chlorophyll a and b concentrations, relative water content (RWC), and fruit yield characters were negatively affected and significantly reduced under salinity conditions. The higher concentration was more harmful. Nevertheless, electrolyte leakage, lipid peroxidation, hydrogen peroxide (H2O2), and superoxide (O2−) significantly increased in stressed plants. However, the application of B. thuringiensis and chitosan led to improved plant growth and resulted in a significant increase in RWC, chlorophyll content, chlorophyll fluorescence parameter (Fv/Fm ratio), and fruit yield. Conversely, lipid peroxidation, electrolyte leakage, O2−, and H2O2 were significantly reduced in stressed plants. Also, B. thuringiensis and chitosan application regulated the proline accumulation and enzyme activity, as well as increased the number of fruit plant−1, fruit fresh weight plant−1, and total fruit yield of sweet pepper grown under saline conditions.

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“…Along with chemicals, microbiological preparations are also used: rizoplan, trichodermin, agate 25, pseudobacterin, etc. [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The assessment of the efficiency of the plant growth regulator “Cresolan” on grain crops

et al. 2020

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The article examines the regulators of plant growth and development, their properties and influence on living organisms. The new evaluated preparation with the trade name “Cresolan” was studied and tested at the central experimental field at the “Uralets”, the educational farm of the Ural State Agrarian University. Various doses, periods, methods of use, combinations and its comparison with other similar preparations were studied (the experimental tests were carried out on spring wheat of the “Iren” variety and barley of the “Ecolog” variety). The spring wheat and barley plants showed great responsiveness to the preparation. According to the research results, a significant increase in the productivity and resistance of the studied grain crops was revealed, due to the increasing adaptive abilities of plants to the effects of unfavorable environmental factors. It was also concluded that it is necessary to generalize the material and to study some more issues for the development of an adapted technology of application of the plant growth and development regulator “Cresolan”, which ensures stable efficiency.

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Impacts of plant growth promoters and plant growth regulators on rainfed agriculture

Cited by 85 publications

References 95 publications

Mitigation of drought stress in rice crop with plant growth‐promoting abiotic stress‐tolerant rice phyllosphere bacteria

Mitigation of drought stress in rice crop with plant growth‐promoting abiotic stress‐tolerant rice phyllosphere bacteria

Chlorophyll Fluorescence Parameters and Antioxidant Defense System Can Display Salt Tolerance of Salt Acclimated Sweet Pepper Plants Treated with Chitosan and Plant Growth Promoting Rhizobacteria

The assessment of the efficiency of the plant growth regulator “Cresolan” on grain crops

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