Plant Growth Promoting Traits of Indigenous Phosphate Solubilizing
            <i>Pseudomonas aeruginosa</i>
            Isolates from Chilli (
            <i>Capsicum</i>
            annuum L.) Rhizosphere

Mathew, Lizzy; Asok, Aju K.; Thampi, Meenu; Sreekumar, J.; Jisha, M. S.

doi:10.1080/00103624.2019.1566469

Cited by 56 publications

(33 citation statements)

References 40 publications

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“…In this context, a recent study by Marathe et al (2017) demonstrated the ability of an IAAproducing PSB strain (Pseudomonas aeruginosa) to stimulate 2 days earlier seed germination and increase both nutrients uptake (N, P, and K) and chlorophyll content (chl a and chl b). This is fully aligned with the current study's findings as well as a number of previous research investigations ( Khiangte and Lalfakzuala, 2011;Linu et al, 2019;Liu et al, 2019), although accurate quantitative analysis will be required to determine either the amount and the type of IAA likely responsible for root growth (Kowalczyk and Sandberg, 2001;Liu et al, 2012). However, it remains unclear why inoculation with PSB 3 that exhibit the highest IAA production rate did not affect root traits (especially A B FIGURE 4 | Correlations between total chlorophyll and plant P (inorganic (A) and total (B) content in durum wheat inoculated with five PSB isolates and fertilized with rock P (black circles) versus non-inoculated wheat fertilized with P (RP and TSP) treatment alone (grey squares).…”

Section: P Solubilizing Rhizobacteria Had Different Effects On Durum supporting

confidence: 93%

Phosphate Solubilizing Rhizobacteria Could Have a Stronger Influence on Wheat Root Traits and Aboveground Physiology Than Rhizosphere P Solubilization

et al. 2020

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Limited P availability in several agricultural areas is one of the key challenges facing current agriculture. Exploiting P-solubilizing bacteria (PSB) has been an emerging bio-solution for a higher rhizosphere P-availability, meanwhile the above-and below-ground interactions that PSB would trigger remain unclear over plant growing stages. We hypothesized that PSB effects on plant growth may be greater on root traits that positively links with aboveground physiology more than the commonly believed rhizosphere P bio-solubilization. In this study, five contrasting PSB (Pseudomonas spp.) isolates (low "PSB 1 ", moderate "PSB 2 and PSB 4 " and high "PSB 3 and PSB 5 " P-solubilizing capacity "PSC") were used to investigate aboveand below-ground responses in wheat fertilized with rock P (RP) under controlled conditions. Our findings show that all PSB isolates increased wheat root traits, particularly PSB 5 which increased root biomass and PSB 3 that had greater effect on root diameter in 7-, 15-and 42day old plants. The length, surface and volume of roots significantly increased along with higher rhizosphere available P in 15-and 42-day old plants inoculated with PSB 4 and PSB 2. Shoot biomass significantly increased with both PSB 2 and PSB 5. Root and shoot physiology significantly improved with PSB 1 (lowest PSC) and PSB 4 (moderate PSC), notably shoot total P (78.38%) and root phosphatase activity (390%). Moreover, nutrients acquisition and chlorophyll content increased in inoculated plants and was stimulated (PSB 2 , PSB 4) more than rhizosphere P-solubilization, which was also revealed by the significant above-and below-ground inter-correlations, mainly chlorophyll and both total (R = 0.75, p = 0.001**) and intracellular (R = 0.7, p = 0.000114*) P contents. These findings demonstrate the necessity to timely monitor the plant-rhizosphere continuum responses, which may be a relevant approach to accurately evaluate PSB through considering below-and above-ground relationships; thus enabling unbiased interpretations prior to field applications.

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Section: P Solubilizing Rhizobacteria Had Different Effects On Durum supporting

confidence: 93%

Phosphate Solubilizing Rhizobacteria Could Have a Stronger Influence on Wheat Root Traits and Aboveground Physiology Than Rhizosphere P Solubilization

et al. 2020

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“…A possible explanation could be found in the abundance of some Gammaproteobacteria members, particularly the genera Pseudomonas and Pantoea . Both genera exhibited an evident phosphate-solubilization activity, capacity mentioned by other authors [ 49 – 52 ]. In the case of fungal communities, the AMF Glomerales showed variations relative to vintage year (higher in 2015), but not to vineyard site.…”

Section: Discussionsupporting

confidence: 72%

Influence of vintage, geographic location and cultivar on the structure of microbial communities associated with the grapevine rhizosphere in vineyards of San Juan Province, Argentina

et al. 2020

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Soil microbiomes, as a primary reservoir for plant colonizing fungi and bacteria, play a major role in determining plant productivity and preventing invasion by pathogenic microorganisms. The use of 16S rRNA and ITS high-throughput amplicon sequencing for analysis of complex microbial communities have increased dramatically in recent years, establishing links between wine specificity and, environmental and viticultural factors, which are framed into the elusive terroir concept. Given the diverse and complex role these factors play on microbial soil structuring of agricultural crops, the main aim of this study is to evaluate how external factors, such as vintage, vineyard location, cultivar and soil characteristics, may affect the diversity of the microbial communities present. Additionally, we aim to compare the influence these factors have on the structuring of bacterial and fungal populations associated with Malbec grapevine rhizosphere with that of the more widespread Cabernet Sauvignon grapevine cultivar. Samples were taken from Malbec and Cabernet Sauvignon cultivars from two different vineyards in the San Juan Province of Argentina. Total DNA extracts from the rhizosphere soil samples were sequenced using Illumina’s Miseq technology, targeting the V3-V4 hypervariable 16S rRNA region in prokaryotes and the ITS1 region in yeasts. The major bacterial taxa identified were Proteobacteria, Bacteroidetes and Firmicutes, while the major fungal taxa were Ascomycetes, Basidiomycetes, Mortierellomycetes and a low percentage of Glomeromycetes. Significant differences in microbial community composition were found between vintages and vineyard locations, whose soils showed variances in pH, organic matter, and content of carbon, nitrogen, and absorbable phosphorus.

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“…Many novel microorganisms are recently reported as listed above which can solubilize phosphorus to a wide range and produce phytohormones. The bacterial hormone like indole acetic acid also suppresses the growth of fungal pathogens by interacting with the host defense system (Linu et al 2019). Taken together, these findings indicate that these microorganisms can be utilized for phosphorus balance and overall development in plants.…”

Section: Phosphate-solubilizing Microorganisms (Psms)mentioning

confidence: 90%

“…This mode of phosphorus dissolution is predominant in gram-negative bacteria, where dominant organic acids like gluconic acid are produced via alternate pathways for glucose oxidation and diffuse through bacterial periplasm into the surroundings (Krishnaraj and Dahale 2014). Pseudomonas aeruginosa KR270346 also solubilizes phosphorus by secreting gluconic acid by direct oxidation pathway as the dominant acid for phosphorus solubilization (Linu et al 2019).…”

Section: Direct Oxidation Pathwaymentioning

confidence: 99%

Phosphate-Solubilizing Microorganisms: Mechanism and Their Role in Phosphate Solubilization and Uptake

Rawat

Das

Shankhdhar

et al. 2020

J Soil Sci Plant Nutr

347

130

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Phosphorus is the second most critical macronutrient after nitrogen required for metabolism, growth, and development of plants. Despite the abundance of phosphorus in both organic and inorganic forms in the soil, it is mostly unavailable for plant uptake due to its complexation with metal ions in the soil. The use of agrochemicals to satisfy the demand for phosphorus to improve crop yield has led to the deterioration of the ecosystem and soil health, as well as an imbalance in the soil microbiota. Consequently, there is a demand for an alternate cost-effective and eco-friendly strategy for the biofortification of phosphorus. One such strategy is the application of phosphate-solubilizing microorganisms which can solubilize insoluble phosphates in soil by different mechanisms like secretion of organic acids, enzyme production, and excretion of siderophores that can chelate the metal ions and form complexes, making phosphates available for plant uptake. These microbes not only solubilize phosphates but also promote plant growth and crop yield by producing plant-growth-promoting hormones like auxins, gibberellins, and cytokinins, antibiosis against pathogens, 1-aminocyclopropane-1-carboxylic acid deaminase which enhances plant growth under stress conditions, improving plant resistance to heavy metal toxicity, and so on. Pyrroloquinoline quinine (pqq) and glucose dehydrogenase (gcd) are the representative genes for phosphorus solubilization in microorganisms. The content presented in this review paper focuses on different mechanisms and modes of action of phosphate-solubilizing microorganisms, their contribution to phosphorus solubilization, growth-promoting attributes in plants, and the molecular aspects of phosphorus solubilization.

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Plant Growth Promoting Traits of Indigenous Phosphate Solubilizing Pseudomonas aeruginosa Isolates from Chilli ( Capsicum annuum L.) Rhizosphere

Cited by 56 publications

References 40 publications

Phosphate Solubilizing Rhizobacteria Could Have a Stronger Influence on Wheat Root Traits and Aboveground Physiology Than Rhizosphere P Solubilization

Phosphate Solubilizing Rhizobacteria Could Have a Stronger Influence on Wheat Root Traits and Aboveground Physiology Than Rhizosphere P Solubilization

Influence of vintage, geographic location and cultivar on the structure of microbial communities associated with the grapevine rhizosphere in vineyards of San Juan Province, Argentina

Phosphate-Solubilizing Microorganisms: Mechanism and Their Role in Phosphate Solubilization and Uptake

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