scholarly journals Strain-Specific Biostimulant Effects of Chlorella and Chlamydomonas Green Microalgae on Medicago truncatula

Plants ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1060
Author(s):  
Margaret Mukami Gitau ◽  
Attila Farkas ◽  
Benedikta Balla ◽  
Vince Ördög ◽  
Zoltán Futó ◽  
...  
Keyword(s):  
Medicago Truncatula ◽  
Leaf Size ◽  
Green Microalgae ◽  
Fresh Weight ◽  
Fresh Biomass ◽  
Plant Growth Promoting ◽  
Plant Grown ◽  
Growth Promoting ◽  
Chlorella Species ◽  
Weight Number

Microalgae have been identified to produce a plethora of bioactive compounds exerting growth stimulating effects on plants. The objective of this study was to investigate the plant-growth-promoting effects of three selected strains of eukaryotic green microalgae. The biostimulatory effects of two Chlorella species (MACC-360 and MACC-38) and a Chlamydomonas reinhardtii strain (cc124) were investigated in a Medicago truncatula model plant grown under controlled greenhouse conditions. The physiological responses of the M. truncatula A17 ecotype to algal biomass addition were characterized thoroughly. The plants were cultivated in pots containing a mixture of vermiculite and soil (1:3) layered with clay at the bottom. The application of live algae cells using the soil drench method significantly increased the plants’ shoot length, leaf size, fresh weight, number of flowers and pigment content. For most of the parameters analyzed, the effects of treatment proved to be specific for the applied algae strains. Overall, Chlorella application led to more robust plants with increased fresh biomass, bigger leaves and more flowers/pods compared to the control and Chlamydomonas-treated samples receiving identical total nutrients.

scholarly journals Quorum quenching activity of the PGPR Bacillus subtilis UD1022 alters nodulation efficiency of Sinorhizobium meliloti on Medicago truncatula

2020 ◽  
Author(s):  
Amanda Rosier ◽  
Pascale B. Beauregard ◽  
Harsh P. Bais
Keyword(s):  
Bacillus Subtilis ◽  
Plant Growth ◽  
Medicago Truncatula ◽  
Sinorhizobium Meliloti ◽  
Quorum Quenching ◽  
Agricultural System ◽  
Synergistic Activity ◽  
Sustainable Solutions ◽  
Plant Growth Promoting ◽  
Growth Promoting

AbstractPlant growth promoting rhizobacteria (PGPR) have enormous potential for solving some of the myriad challenges facing our global agricultural system. Intense research efforts are rapidly moving the field forward and illuminating the wide diversity of bacteria and their plant beneficial activities. In the development of better crop solutions using these PGPR, producers are including multiple different species of PGPR in their formulations in a ‘consortia’ approach. While the intention is to emulate more natural rhizomicrobiome systems, the aspect of bacterial interactions has not been properly regarded. By using a tri-trophic model of Medicago truncatula A17 Jemalong, its nitrogen (N)-fixing symbiont Sinorhizobium meliloti Rm8530 and the PGPR Bacillus subtilis UD1022, we demonstrate indirect influences between the bacteria affecting their plant growth promoting activities. Co-cultures of UD1022 with Rm8530 significantly reduced Rm8530 biofilm formation and downregulated quorum sensing (QS) genes responsible for symbiotically active biofilm production. This work also identifies the presence and activity of a quorum quenching lactonase in UD1022 and proposes this as the mechanism for non-synergistic activity of this model ‘consortium’. These interspecies interactions may be common in the rhizosphere and are critical to understand as we seek to develop new sustainable solutions in agriculture.

scholarly journals PROSPECTING CYANOBACTERIA-FORTIFIED COMPOSTS AS PLANT GROWTH PROMOTING AND BIOCONTROL AGENTS IN COTTON

2014 ◽  
Vol 51 (1) ◽  
pp. 42-65 ◽  
Author(s):  
RADHA PRASANNA ◽  
SANTOSH BABU ◽  
NGANGOM BIDYARANI ◽  
ARUN KUMAR ◽  
SODIMALLA TRIVENI ◽  
...  
Keyword(s):  
Plant Growth ◽  
Management Strategies ◽  
Hydrolytic Enzymes ◽  
Biocontrol Agents ◽  
Fresh Weight ◽  
Available Nitrogen ◽  
Cotton Crop ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Increased Activity

SUMMARYThe potential of cyanobacteria-based compost formulations was evaluated in cotton crop at two agro-ecological locations (Nagpur and Sirsa) as plant growth promoting (PGP) and biocontrol agents. Compost-based formulations fortified withCalothrixsp. orAnabaenasp. enhanced germination and fresh weight of plants, and microbiological activity by 10–15%, besides increased available nitrogen (by 20–50%) in soil at Nagpur. In the fungi-infected fields at Sirsa,Anabaena–T. viridebiofilmed formulation performed the best, recording 11.1% lower plant mortality than commercialTrichodermaformulation. Scanning electron microscopy confirmed the colonisation of inoculated cyanobacteria/biofilms on roots. Significant correlation between mortality, increased activity of hydrolytic enzymes and fresh weight of plant roots were recorded.Calothrixsp. andAnabaenasp. proved promising as both PGP and biocontrol agents, while biofilmed formulations substantially reduced mortality of cotton plants in sick plots. This study illustrates the promise of cyanobacteria as viable inoculation option for integrated nutrient and pest management strategies of cotton.

scholarly journals Bioprospecting desert plant Bacillus endophytic strains for their potential to enhance plant stress tolerance

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Ameerah Bokhari ◽  
Magbubah Essack ◽  
Feras F. Lafi ◽  
Cristina Andres-Barrao ◽  
Rewaa Jalal ◽  
...  
Keyword(s):  
Salt Stress ◽  
Plant Growth ◽  
Growth Promotion ◽  
Stress Conditions ◽  
Desert Plant ◽  
Plant Growth Promoting Bacteria ◽  
Fresh Weight ◽  
Pgp Traits ◽  
Plant Growth Promoting ◽  
Growth Promoting

AbstractPlant growth-promoting bacteria (PGPB) are known to increase plant tolerance to several abiotic stresses, specifically those from dry and salty environments. In this study, we examined the endophyte bacterial community of five plant species growing in the Thar desert of Pakistan. Among a total of 368 culturable isolates, 58 Bacillus strains were identified from which the 16 most divergent strains were characterized for salt and heat stress resilience as well as antimicrobial and plant growth-promoting (PGP) activities. When the 16 Bacillus strains were tested on the non-host plant Arabidopsis thaliana, B. cereus PK6-15, B. subtilis PK5-26 and B. circulans PK3-109 significantly enhanced plant growth under salt stress conditions, doubling fresh weight levels when compared to uninoculated plants. B. circulans PK3-15 and PK3-109 did not promote plant growth under normal conditions, but increased plant fresh weight by more than 50% when compared to uninoculated plants under salt stress conditions, suggesting that these salt tolerant Bacillus strains exhibit PGP traits only in the presence of salt. Our data indicate that the collection of 58 plant endophytic Bacillus strains represents an important genomic resource to decipher plant growth promotion at the molecular level.

Effect of Pseudomonas aeruginosa ZGKD2 on the Growth of Amorpha fruticosa L in Coal Gangue

2013 ◽  
Vol 807-809 ◽  
pp. 2023-2026
Author(s):  
Yu Xiu Zhang ◽  
Pei Li Shi ◽  
Qian Zhang
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Acetic Acid ◽  
Plant Growth ◽  
Root Length ◽  
Phosphate Solubilization ◽  
Fresh Weight ◽  
Amorpha Fruticosa ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Indole 3 Acetic Acid

The cadmium-resistant Pseudomonas aeruginosa strain ZGKD2 was isolated from gangue pile of coal area. Production of siderophores, indole-3-acetic acid (IAA) and the solubilization of phosphate were observed in the strain. Two types of siderophores were identified by UV spectrophotometer. The highest production of IAA and phosphate solubilization were 2.0 ug/mL and 7.2 ug/mL. The root length, plant height and fresh weight of Amorpha fruticosa L in the substrates of Coal gannue and losses were promoted after inoculation with ZGKD2. These data indicated that Pseudomonas aeruginosa strain ZGKD2 was a plant growth-promoting bacterial (PGPB).

scholarly journals Deciphering the Potential of Rhizobium pusense MB-17a, a Plant Growth-Promoting Root Endophyte, and Functional Annotation of the Genes Involved in the Metabolic Pathway

2021 ◽  
Vol 8 ◽  
Author(s):  
Twinkle Chaudhary ◽  
Rajesh Gera ◽  
Pratyoosh Shukla
Keyword(s):  
Plant Growth ◽  
Mung Bean ◽  
Growth Promotion ◽  
Acc Deaminase ◽  
Endophytic Bacterium ◽  
Fresh Weight ◽  
Root Endophyte ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Plant Growth Promoting Traits

Plant growth-promoting rhizobacteria (PGPR) are root endophytic bacteria used for growth promotion, and they have broader applications in enhancing specific crop yield as a whole. In the present study, we have explored the potential of Rhizobium pusense MB-17a as an endophytic bacterium isolated from the roots of the mung bean (Vigna radiata) plant. Furthermore, this bacterium was sequenced and assembled to reveal its genomic potential associated with plant growth-promoting traits. Interestingly, the root endophyte R. pusense MB-17a showed all essential PGPR traits which were determined by biochemical and PGPR tests. It was noted that this root endophytic bacterium significantly produced siderophores, indole acetic acid (IAA), ammonia, and ACC deaminase and efficiently solubilized phosphate. The maximum IAA and ammonia produced were observed to be 110.5 and 81 μg/ml, respectively. Moreover, the PGPR potential of this endophytic bacterium was also confirmed by a pot experiment for mung bean (V. radiata), whose results show a substantial increase in the plant's fresh weight by 76.1% and dry weight by 76.5% on the 60th day after inoculation of R. pusense MB-17a. Also, there is a significant enhancement in the nodule number by 66.1% and nodule fresh weight by 162% at 45th day after inoculation with 100% field capacity after the inoculation of R. pusense MB-17a. Besides this, the functional genomic annotation of R. pusense MB-17a determined the presence of different proteins and transporters that are responsible for its stress tolerance and its plant growth-promoting properties. It was concluded that the unique presence of genes like rpoH, otsAB, and clpB enhances the symbiosis process during adverse conditions in this endophyte. Through Rapid Annotation using Subsystem Technology (RAST) analysis, the key genes involved in the production of siderophores, volatile compounds, indoles, nitrogenases, and amino acids were also predicted. In conclusion, the strain described in this study gives a novel idea of using such type of endophytes for improving plant growth-promoting traits under different stress conditions for sustainable agriculture.

scholarly journals Bacillus Co-Inoculation Alleviated Salt Stress in Seedlings Cucumber

Agronomy ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 966
Author(s):  
Ruixue Qi ◽  
Wei Lin ◽  
Kaixuan Gong ◽  
Zeyu Han ◽  
Hui Ma ◽  
...  
Keyword(s):  
Salt Stress ◽  
Phosphorus Content ◽  
Plant Growth Promoting Rhizobacteria ◽  
Available Phosphorus ◽  
Fresh Weight ◽  
Sustainable Food ◽  
Cucumber Seedlings ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Harmful Effects

Soil salinity has become a serious threat to crop growth and productivity and has aggravated the gap between sustainable food supply and population growth. Application of plant growth-promoting rhizobacteria (PGPR) has emerged as a novel way of alleviating the harmful effects of salt stress and improving soil nutrients. The aim of this study was to study the effects of exposure cucumber seedlings at one co-inoculation of Bacillus licheniformis and B. subtilis, a mitigation of salt stress in cucumber seedlings. In this study, we isolated salt tolerant (NX-3 and NX-4) and growth-promoting (NX-48, NX-59, and NX-62) bacteria from the rhizosphere of cucumber. NX-3 and NX-59 were identified as B. licheniformis, and NX-4, NX-48 and NX-62 were identified as B. subtilis. Under salt stress, relative to non-inoculation, co-inoculation with B. licheniformis and B. subtilis increased stem diameter and plant fresh weight. Moreover, the concentration of substrate available phosphorus increased (except for NX4-59). The catalase and sucrase activities of NX4-62 were the highest. Meanwhile, NX3-62 and NX3-59 had the highest phosphorus content and NX3-59 had the highest urease activities. Comprehensive analysis indicated that NX4-62 and NX3-59 showed the best effect on promoting cucumber seedlings growth, activating substrate nutrients, and alleviate salt stress in seedlings of cucumber.

scholarly journals Evaluation of synergistic potential of plant growth promoting rhizobacteria with Rhizobium in mungbean (Vigna radiata L.)

2016 ◽  
Vol 8 (2) ◽  
pp. 995-998 ◽  
Author(s):  
Satveer Kaur ◽  
Veena Khanna
Keyword(s):  
Plant Growth ◽  
Dry Weight ◽  
Plant Growth Promoting Rhizobacteria ◽  
Fresh Weight ◽  
Agricultural Chemicals ◽  
Rhizobium Inoculation ◽  
Nodule Number ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Plant Length

A pot experiment was conducted in glass house at PAU research farm, Ludhiana, Punjab, India to evaluate effect of co-inoculation of plant growth promoting rhizobacteria with Rhizobium on mungbean productivity. Coinoculation showed a significant increase at 5% in nodule number, nodule dry weight, shoot and root dry and fresh weight, plant length, no. of pods, chlorophyll and leghaemoglobin content, over Rhizobium alone. Application of PGPRs R-4, R-6, S-5, S-9 and S-11 along with Rhizobium further enhanced the grain yield over Rhizobium inoculation alone. Rizobacterial isolates R-6 and S-11 co-inoculated with Rhizobium showed better result than other isolates.These plant beneficial rhizobacteria may decrease the global dependence on various hazardous agricultural chemicals used in mungbean.

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