Crosstalk amongst phytohormones from planta and PGPR under biotic and abiotic stresses

Khan, Naeem; Bano, Asghari; Ali, Shahid; Babar, Ali

doi:10.1007/s10725-020-00571-x

Cited by 276 publications

(124 citation statements)

References 140 publications

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“…Similar observations were noted with Streptomyces strains BCA-546 and CAI-8 [13] and Amycolatopsis [17]. These results support the hypothesis that the PGPR not only enhance the plant growth through root colonization but also exhibit indirect benefits such as disease suppression as reported in other studies [29][30][31].…”

Section: Greenhouse and Field Trialssupporting

confidence: 90%

Identification and Characterization of a Streptomyces albus Strain and Its Secondary Metabolite Organophosphate against Charcoal Rot of Sorghum

Gopalakrishnan

Sharma

Srinivas

et al. 2020

Plants

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Streptomycesalbus strain CAI-21 has been previously reported to have plant growth-promotion abilities in chickpea, pigeonpea, rice, and sorghum. The strain CAI-21 and its secondary metabolite were evaluated for their biocontrol potential against charcoal rot disease in sorghum caused by Macrophomina phaseolina. Results exhibited that CAI-21 significantly inhibited the growth of the pathogen, M. phaseolina, in dual-culture (15 mm; zone of inhibition), metabolite production (74% inhibition), and blotter paper (90% inhibition) assays. When CAI-21 was tested for its biocontrol potential under greenhouse and field conditions following inoculation of M. phaseolina by toothpick method, it significantly reduced the number of internodes infected (75% and 45% less, respectively) and length of infection (75% and 51% less, respectively) over the positive control (only M. phaseolina inoculated) plants. Under greenhouse conditions, scanning electron microscopic analysis showed that the phloem and xylem tissues of the CAI-21-treated shoot samples were intact compared to those of the diseased stem samples. The culture filtrate of the CAI-21 was purified by various chromatographic techniques, and the active compound was identified as “organophosphate” by NMR and MS. The efficacy of organophosphate was found to inhibit the growth of M. phaseolina in the poisoned food technique. This study indicates that S.albus CAI-21 and its active metabolite organophosphate have the potential to control charcoal rot in sorghum.

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Section: Greenhouse and Field Trialssupporting

confidence: 90%

Identification and Characterization of a Streptomyces albus Strain and Its Secondary Metabolite Organophosphate against Charcoal Rot of Sorghum

Gopalakrishnan

Sharma

Srinivas

et al. 2020

Plants

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“…It is ethylene which is responsible for mediating cross-talk between these two pathways and for exhibiting the desired response [154]. Furthermore, there exists an antagonistic interaction between ethylene and gibberellins, which helps in adjusting salinity tolerance either by regulating or initiating the defense system [155] ( Figure 3).…”

Section: Cross-talk Between Ethylene and Various Plant Hormones Durinmentioning

confidence: 99%

Ethylene: A Master Regulator of Salinity Stress Tolerance in Plants

et al. 2020

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Salinity stress is one of the major threats to agricultural productivity across the globe. Research in the past three decades, therefore, has focused on analyzing the effects of salinity stress on the plants. Evidence gathered over the years supports the role of ethylene as a key regulator of salinity stress tolerance in plants. This gaseous plant hormone regulates many vital cellular processes starting from seed germination to photosynthesis for maintaining the plants’ growth and yield under salinity stress. Ethylene modulates salinity stress responses largely via maintaining the homeostasis of Na+/K+, nutrients, and reactive oxygen species (ROS) by inducing antioxidant defense in addition to elevating the assimilation of nitrates and sulfates. Moreover, a cross-talk of ethylene signaling with other phytohormones has also been observed, which collectively regulate the salinity stress responses in plants. The present review provides a comprehensive update on the prospects of ethylene signaling and its cross-talk with other phytohormones to regulate salinity stress tolerance in plants.

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“…For social communication and environmental sensing both beneficial and pathogenic bacteria use QS. QS is a regulatory mechanism that works on the gene level, where bacteria produce a wide range of small singling molecules known as auto-inducers (AI) ( Khan et al, 2020 ). Bacteria release AIs into the environment to assess their surroundings, and help them adapt their gene expression in response to the given conditions to optimize their population number and fitness.…”

Section: Application Of Desert Pgpr For Sustainable Agriculturementioning

confidence: 99%

Desert Microbes for Boosting Sustainable Agriculture in Extreme Environments

2020

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A large portion of the earth's surface consists of arid, semi-arid and hyper-arid lands. Life in these regions is profoundly challenged by harsh environmental conditions of water limitation, high levels of solar radiation and temperature fluctuations, along with soil salinity and nutrient deficiency, which have serious consequences on plant growth and survival. In recent years, plants that grow in such extreme environments and their naturally associated beneficial microbes have attracted increased interest. The rhizosphere, rhizosheath, endosphere, and phyllosphere of desert plants display a perfect niche for isolating novel microbes. They are well adapted to extreme environments and offer an unexploited reservoir for bio-fertilizers and bio-control agents against a wide range of abiotic and biotic stresses that endanger diverse agricultural ecosystems. Their properties can be used to improve soil fertility, increase plant tolerance to various environmental stresses and crop productivity as well as benefit human health and provide enough food for a growing human population in an environment-friendly manner. Several initiatives were launched to discover the possibility of using beneficial microbes. In this review, we will be describing the efforts to explore the bacterial diversity associated with desert plants in the arid, semi-arid, and hyper-arid regions, highlighting the latest discoveries and applications of plant growth promoting bacteria from the most studied deserts around the world.

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Crosstalk amongst phytohormones from planta and PGPR under biotic and abiotic stresses

Cited by 276 publications

References 140 publications

Identification and Characterization of a Streptomyces albus Strain and Its Secondary Metabolite Organophosphate against Charcoal Rot of Sorghum

Identification and Characterization of a Streptomyces albus Strain and Its Secondary Metabolite Organophosphate against Charcoal Rot of Sorghum

Ethylene: A Master Regulator of Salinity Stress Tolerance in Plants

Desert Microbes for Boosting Sustainable Agriculture in Extreme Environments

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