scholarly journals The Contrivance of Plant Growth Promoting Microbes to Mitigate Climate Change Impact in Agriculture

2021 ◽  
Vol 9 (9) ◽  
pp. 1841
Author(s):  
Angelika Fiodor ◽  
Surender Singh ◽  
Kumar Pranaw
Keyword(s):  
Climate Change ◽  
Plant Growth ◽  
Global Climate ◽  
Acc Deaminase ◽  
Crop Productivity ◽  
Plant Growth Promoting Bacteria ◽  
Hormone Synthesis ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
The Impact

Combating the consequences of climate change is extremely important and critical in the context of feeding the world’s population. Crop simulation models have been extensively studied recently to investigate the impact of climate change on agricultural productivity and food security. Drought and salinity are major environmental stresses that cause changes in the physiological, biochemical, and molecular processes in plants, resulting in significant crop productivity losses. Excessive use of chemicals has become a severe threat to human health and the environment. The use of beneficial microorganisms is an environmentally friendly method of increasing crop yield under environmental stress conditions. These microbes enhance plant growth through various mechanisms such as production of hormones, ACC deaminase, VOCs and EPS, and modulate hormone synthesis and other metabolites in plants. This review aims to decipher the effect of plant growth promoting bacteria (PGPB) on plant health under abiotic soil stresses associated with global climate change (viz., drought and salinity). The application of stress-resistant PGPB may not only help in the combating the effects of abiotic stressors, but also lead to mitigation of climate change. More thorough molecular level studies are needed in the future to assess their cumulative influence on plant development.

scholarly journals İklim Değişikliğinin Bitki-Faydalı Mikroorganizma Etkileşimleri Üzerindeki Etkileri

2022 ◽  
Vol 9 (sp) ◽  
pp. 2594-2603
Author(s):  
Kubilay Kurtulus Bastas
Keyword(s):  
Climate Change ◽  
Plant Growth ◽  
Mycorrhizal Fungi ◽  
Global Climate ◽  
Plant Growth Promoting Bacteria ◽  
Plant Interactions ◽  
Beneficial Microorganisms ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Carbon Dioxide Co2

Global climate is estimated to change drastically over the next century and the ecosystems will be affected in this changing environment. Plant-associated beneficial microorganisms can stimulate plant growth and increase resistance to biotic and abiotic stresses. Nowadays, the effects of climate change factors such as increased carbon dioxide (CO2), drought and warming on plant-beneficial microorganism interactions are increasingly being investigated in the scope of plant growth and health. Recent studies have shown that high CO2 level has a positive effect on the abundance of mycorrhizal fungi, whereas the effects on plant growth promoting bacteria and endophytic fungi are more variable. Elevated CO2 conditions lead to increased colonization of beneficial fungi. Additionally, the results of increasing CO2 levels, warming and drought, depend upon the plant and the microbial genotype. Also, plant growth promoting microorganisms, especially bacteria, positively affect plants exposed to drought stress. Altered communities of beneficial microorganisms depending on climate changes, might have to compete with different microbial communities and, therefore microbial activities may also get affected. This work presents that climate change is an important factor affecting microorganism and plant interactions, needs to take into consideration the adaptation processes in plants and microorganisms and might require the selection of adapted plant cultivars.

scholarly journals The Use of Plant Growth-Promoting Bacteria to Prevent Nematode Damage to Plants

Biology ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 381
Author(s):  
Elisa Gamalero ◽  
Bernard R. Glick
Keyword(s):  
Plant Growth ◽  
Soil Bacteria ◽  
Global Climate ◽  
Parasitic Nematodes ◽  
Plant Growth Promoting Bacteria ◽  
Plant Parasitic Nematodes ◽  
Chemical Agents ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Plant Parasitic

Plant-parasitic nematodes have been estimated to annually cause around US $173 billion in damage to plant crops worldwide. Moreover, with global climate change, it has been suggested that the damage to crops from nematodes is likely to increase in the future. Currently, a variety of potentially dangerous and toxic chemical agents are used to limit the damage to crops by plant-parasitic nematodes. As an alternative to chemicals and a more environmentally friendly means of decreasing nematode damage to plants, researchers have begun to examine the possible use of various soil bacteria, including plant growth-promoting bacteria (PGPB). Here, the current literature on some of the major mechanisms employed by these soil bacteria is examined. It is expected that within the next 5–10 years, as scientists continue to elaborate the mechanisms used by these bacteria, biocontrol soil bacteria will gradually replace the use of chemicals as nematicides.

ACC deaminase from plant growth-promoting bacteria affects crown gall development

2007 ◽  
Vol 53 (12) ◽  
pp. 1291-1299 ◽  
Author(s):  
Youai Hao ◽  
Trevor C. Charles ◽  
Bernard R. Glick
Keyword(s):  
Plant Growth ◽  
Castor Bean ◽  
Crown Gall ◽  
Acc Deaminase ◽  
Plant Growth Promoting Bacteria ◽  
Bean Plants ◽  
Tumour Formation ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Agrobacterium Tumefaciens C58

In addition to the well-known roles of indoleacetic acid and cytokinin in crown gall formation, the plant hormone ethylene also plays an important role in this process. Many plant growth-promoting bacteria (PGPB) encode the enzyme 1-aminocyclopropane-1-carboxylate (ACC) deaminase, which can degrade ACC, the immediate precursor of ethylene in plants, to α-ketobutyrate and ammonia and thereby lower plant ethylene levels. To study the effect of ACC deaminase on crown gall development, an ACC deaminase gene from the PGPB Pseudomonas putida UW4 was introduced into Agrobacterium tumefaciens C58, so that the effect of ACC deaminase activity on tumour formation in tomato and castor bean plants could be assessed. Plants were also coinoculated with A. tumefaciens C58 and P. putida UW4 or P. putida UW4-acdS– (an ACC deaminase minus mutant strain). In both types of experiments, it was observed that the presence of ACC deaminase generally inhibited tumour development on both tomato and castor bean plants.

Levels of ACC and related compounds in exudate and extracts of canola seeds treated with ACC deaminase-containing plant growth-promoting bacteria

2001 ◽  
Vol 47 (4) ◽  
pp. 368-372 ◽  
Author(s):  
Donna M Penrose ◽  
Bernard R Glick
Keyword(s):  
Plant Growth ◽  
Acc Deaminase ◽  
Aminobutyric Acid ◽  
Plant Growth Promoting Bacteria ◽  
Canola Seed ◽  
Test Part ◽  
Seed Exudate ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Related Compounds

It was previously proposed that plant growth-promoting bacteria that possess 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase could utilize ACC that is present in the exudate of germinating canola seeds. The uptake and cleavage of ACC by these bacteria would lower the level of ACC, and thus ethylene within the plant, and reduce the extent of its inhibition on root elongation. To test part of the above mentioned model, ACC levels were monitored in canola seed tissues and exudate during germination. Lower amounts of ACC were present in the exudate and tissues of seeds treated with the plant growth-promoting bacterium Enterobacter cloacae CAL3, than in control seeds treated with MgSO4. The ACC-related compounds, α- and γ-aminobutyric acids, both known to stimulate ethylene production, were also measured in the canola seed exudate and tissues. Approximately the same levels of α-aminobutyric acid were present in the exudates of the bacterium-treated seeds and the control seeds, but the amount of α-aminobutyric acid was lower in the tissues of the bacterium-treated seeds than in the control seeds. Smaller quantities of γ-aminobutyric acid were seen in both the exudate and tissues of the E. cloacae CAL3-treated seeds than in the control seeds.Key words: ACC ethylene, canola, seed extract, seed exudate, plant growth-promoting bacteria.

Involvement ofgacSandrpoSin enhancement of the plant growth-promoting capabilities ofEnterobacter cloacaeCAL2 and UW4

2001 ◽  
Vol 47 (8) ◽  
pp. 698-705 ◽  
Author(s):  
Saleema S Saleh ◽  
Bernard R Glick
Keyword(s):  
Plant Growth ◽  
Pseudomonas Fluorescens ◽  
Indoleacetic Acid ◽  
Acc Deaminase ◽  
Enterobacter Cloacae ◽  
Lag Phase ◽  
Plant Growth Promoting Bacteria ◽  
Multicopy Plasmid ◽  
Plant Growth Promoting ◽  
Growth Promoting

The plant growth-promoting bacteria Enterobacter cloacae CAL2 and UW4 were genetically transformed with a multicopy plasmid containing an rpoS or gacS gene from Pseudomonas fluorescens. The transformed strains were compared with the nontransformed strains for growth, indoleacetic acid (IAA) production, antibiotic production, 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity, siderophore production, cell morphology, and the ability to promote canola root elongation. All transformed strains had a longer lag phase, were slower in reaching stationary phase, and attained a higher cell density than the nontransformed strains. Transformation resulted in cells that were significantly shorter than the nontransformed cells. The transformed strains also produced significantly more IAA than the nontransformed strains. Introduction of rpoS or gacS from Pseudomonas fluorescens was associated with a reduction in the production of both antibiotics, 2,4-diacetylphloroglucinol and mono-acetylphloroglucinol, produced by Enterobacter cloacae CAL2. With Enterobacter cloacae CAL2, plasmid-borne rpoS, but not gacS, increased the level of ACC deaminase activity, while introduction of rpoS in Enterobacter cloacae UW4 caused a decrease in ACC deaminase activity. Neither gacS nor rpoS significantly affected the level of siderophores synthesized by either bacterial strain. Overproduction of either GacA or RpoS in Enterobacter cloacae CAL2 resulted in a significant increase in the root lengths of canola seedlings when seeds were treated with the bacteria, and overproduction of RpoS caused an increase in canola shoot as well as root lengths.Key words: plant growth-promoting bacteria, canola, ethylene, ACC deaminase, GacS, RpoS, indoleacetic acid, siderophores, antibiotics.

Determination of 1-aminocycopropane-1-carboxylic acid (ACC) to assess the effects of ACC deaminase-containing bacteria on roots of canola seedlings

2001 ◽  
Vol 47 (1) ◽  
pp. 77-80 ◽  
Author(s):  
Donna M Penrose ◽  
Barbara A Moffatt ◽  
Bernard R Glick
Keyword(s):  
Carboxylic Acid ◽  
Plant Growth ◽  
Root Elongation ◽  
Acc Deaminase ◽  
Plant Growth Promoting Bacteria ◽  
Psychrophilic Bacterium ◽  
Ethylene Inhibitor ◽  
Seedling Roots ◽  
Plant Growth Promoting ◽  
Growth Promoting

Previously, it was proposed that plant growth-promoting bacteria that possess the enzyme, 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase, can reduce the amount of ethylene produced by a plant and thereby promote root elongation. To test this model, canola seeds were imbibed in the presence of the chemical ethylene inhibitor, 2-aminoethoxyvinyl glycine (AVG), various strains of plant growth-promoting bacteria, and a psychrophilic bacterium containing an ACC deaminase gene on a broad host range plasmid. The extent of root elongation and levels of ACC, the immediate precursor of ethylene, were measured in the canola seedling roots. A modification of the Waters AccQ*Tag Amino Acid Analysis Method(tm) was used to quantify ACC in the root extracts. It was found that, in the presence of the ethylene inhibitor, AVG, or any one of several ACC deaminase-containing strains of bacteria, the growth of canola seedling roots was enhanced and the ACC levels in these roots were lowered.

scholarly journals Current Advances in Plant Growth Promoting Bacteria Alleviating Salt Stress for Sustainable Agriculture

2020 ◽  
Vol 10 (20) ◽  
pp. 7025
Author(s):  
Slimane Mokrani ◽  
El-hafid Nabti ◽  
Cristina Cruz
Keyword(s):  
Plant Growth ◽  
Sustainable Agriculture ◽  
Agricultural Soils ◽  
Crop Productivity ◽  
Modern World ◽  
Saline Stress ◽  
Plant Growth Promoting Bacteria ◽  
Stress Alleviation ◽  
Plant Growth Promoting ◽  
Growth Promoting

Humanity in the modern world is confronted with diverse problems at several levels. The environmental concern is probably the most important as it threatens different ecosystems, food, and farming as well as humans, animals, and plants. More specifically, salinization of agricultural soils is a global concern because of on one side, the permanent increase of the areas affected, and on the other side, the disastrous damage caused to various plants affecting hugely crop productivity and yields. Currently, great attention is directed towards the use of Plant Growth Promoting Bacteria (PGPB). This alternative method, which is healthy, safe, and ecological, seems to be very promising in terms of simultaneous salinity alleviation and improving crop productivity. This review attempts to deal with different aspects of the current advances concerning the use of PGPBs for saline stress alleviation. The objective is to explain, discuss, and present the current progress in this area of research. We firstly discuss the implication of PGPB on soil desalinization. We present the impacts of salinity on crops. We look for the different salinity origin and its impacts on plants. We discuss the impacts of salinity on soil. Then, we review various recent progress of hemophilic PGPB for sustainable agriculture. We categorize the mechanisms of PGPB toward salinity tolerance. We discuss the use of PGPB inoculants under salinity that can reduce chemical fertilization. Finally, we present some possible directions for future investigation. It seems that PGPBs use for saline stress alleviation gain more importance, investigations, and applications. Regarding the complexity of the mechanisms implicated in this domain, various aspects remain to be elucidated.

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