Plants Saline Environment in Perception with Rhizosphere Bacteria Containing 1-Aminocyclopropane-1-Carboxylate Deaminase

Soil salinity stress has become a serious roadblock for food production worldwide since it is one of the key factors affecting agricultural productivity. Salinity and drought are predicted to cause considerable loss of crops. To deal with this difficult situation, a variety of strategies have been developed, including plant breeding, plant genetic engineering, and a wide range of agricultural practices, including the use of plant growth-promoting rhizobacteria (PGPR) and seed biopriming techniques, to improve the plants’ defenses against salinity stress, resulting in higher crop yields to meet future human food demand. In the present review, we updated and discussed the negative effects of salinity stress on plant morphological parameters and physio-biochemical attributes via various mechanisms and the beneficial roles of PGPR with 1-Aminocyclopropane-1-Carboxylate(ACC) deaminase activity as green bio-inoculants in reducing the impact of saline conditions. Furthermore, the applications of ACC deaminase-producing PGPR as a beneficial tool in seed biopriming techniques are updated and explored. This strategy shows promise in boosting quick seed germination, seedling vigor and plant growth uniformity. In addition, the contentious findings of the variation of antioxidants and osmolytes in ACC deaminase-producing PGPR treated plants are examined.

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Roles of Plant Growth-Promoting Rhizobacteria (PGPR) in Stimulating Salinity Stress Defense in Plants: A Review

International Journal of Molecular Sciences ◽

10.3390/ijms22063154 ◽

2021 ◽

Vol 22 (6) ◽

pp. 3154

Author(s):

Dung Minh Ha-Tran ◽

Trinh Thi My Nguyen ◽

Shih-Hsun Hung ◽

Eugene Huang ◽

Chieh-Chen Huang

Keyword(s):

Salt Stress ◽

Plant Growth ◽

Crop Yields ◽

Agricultural Practices ◽

Plant Growth Promoting Rhizobacteria ◽

Significant Loss ◽

Seed Vigor ◽

Plant Growth Promoting ◽

Growth Promoting ◽

Seed Biopriming

To date, soil salinity becomes a huge obstacle for food production worldwide since salt stress is one of the major factors limiting agricultural productivity. It is estimated that a significant loss of crops (20–50%) would be due to drought and salinity. To embark upon this harsh situation, numerous strategies such as plant breeding, plant genetic engineering, and a large variety of agricultural practices including the applications of plant growth-promoting rhizobacteria (PGPR) and seed biopriming technique have been developed to improve plant defense system against salt stress, resulting in higher crop yields to meet human’s increasing food demand in the future. In the present review, we update and discuss the advantageous roles of beneficial PGPR as green bioinoculants in mitigating the burden of high saline conditions on morphological parameters and on physio-biochemical attributes of plant crops via diverse mechanisms. In addition, the applications of PGPR as a useful tool in seed biopriming technique are also updated and discussed since this approach exhibits promising potentials in improving seed vigor, rapid seed germination, and seedling growth uniformity. Furthermore, the controversial findings regarding the fluctuation of antioxidants and osmolytes in PGPR-treated plants are also pointed out and discussed.

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Roles of Plant Growth-Promoting Rhizobacteria (PGPR) in Stimulating Salinity Stress Defense in Plants: A Review

10.20944/preprints202103.0041.v1 ◽

2021 ◽

Author(s):

Dung Minh Ha-Tran ◽

Trinh Thi My Nguyen ◽

Shih-Hsun Hung ◽

Eugene Huang ◽

Chieh-Chen Huang

Keyword(s):

Salt Stress ◽

Plant Growth ◽

Crop Yields ◽

Agricultural Practices ◽

Plant Growth Promoting Rhizobacteria ◽

Significant Loss ◽

Seed Vigor ◽

Plant Growth Promoting ◽

Growth Promoting ◽

Seed Biopriming

To date, soil salinity becomes a huge obstacle for food production worldwide since salt stress in plants is one of the major factors limiting agricultural productivity. It is estimated that a significant loss of crops (20%–50%) would be due to drought and salinity. To embark upon this harsh situation, numerous strategies such as plant breeding, plant genetic engineering, and a large variety of agricultural practices including the applications of plant growth-promoting rhizobacteria (PGPR) and seed biopriming technique have been developed to improve plant defense system against salt stress, resulting in higher crop yields to meet human’s increasing food demand in the future. In the present review, we update and discuss the advantageous roles of beneficial PGPR as green bioinoculants in mitigating the burden of high saline conditions on morphological parameters and on physio-biochemical attributes of plant crops via diverse mechanisms. In addition, the applications of PGPR as a useful tool in seed biopriming technique are also updated and discussed since this approach exhibits promising potentials in improving seed vigor, rapid seed germination, and seedling growth uniformity, Furthermore, the controversial findings regarding the fluctuation of antioxidants and osmolytes in PGPR-treated plants are also pointed out and discussed.

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Plant Growth Promoting Rhizobacterial Biofertilizers for Sustainable Crop Production: The Past, Present, and Future

10.20944/preprints202009.0650.v1 ◽

2020 ◽

Author(s):

Becky N. Aloo ◽

Billy A. Makumba ◽

Ernest R. Mbega

Keyword(s):

Plant Growth ◽

Crop Production ◽

Crop Yields ◽

Agricultural Practices ◽

Plant Growth Promoting Rhizobacteria ◽

Full Potential ◽

Sustainable Crop Production ◽

Indigenous Plant ◽

Plant Growth Promoting ◽

Growth Promoting

The world’s population is increasing and so are agricultural activities to match the growing demand for food. Conventional agricultural practices generally employ artificial fertilizers to increase crop yields, but these have multiple environmental and human health effects. For decades, environmentalists and sustainability researchers have focused on alternative crop fertilization mechanisms to address these challenges, and biofertilizers have constantly been researched, recommended, and even successfully-adopted for several crops. Biofertilizers are microbial formulations made of indigenous plant growth-promoting rhizobacteria (PGPR) which can naturally improve plant growth either directly or indirectly, through the production of phytohormones, solubilization of soil nutrients, and production of iron-binding metabolites; siderophores. Biofertilizers, therefore, hold immense potential as tools for sustainable crop production especially in the wake of climate change and global warming. Despite the mounting interest in this technology, their full potential has not yet been realized. This review updates our understanding of the PGPR biofertilizers and sustainable crop production. It evaluates the history of these microbial products, assesses their present state of utilization, and also critically propounds on their future prospects for sustainable crop production. Such information is desirable to fully evaluate their potential and can ultimately pave the way for their increased adoption for crop production.

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ACC deaminase producing plant growth promoting rhizobacteria enhance salinity stress tolerance in Pisum sativum

3 Biotech ◽

10.1007/s13205-021-03047-5 ◽

2021 ◽

Vol 11 (12) ◽

Author(s):

Anmol Gupta ◽

Ambreen Bano ◽

Smita Rai ◽

Manoj Kumar ◽

Jasarat Ali ◽

...

Keyword(s):

Pisum Sativum ◽

Plant Growth ◽

Stress Tolerance ◽

Salinity Stress ◽

Acc Deaminase ◽

Plant Growth Promoting Rhizobacteria ◽

Plant Growth Promoting ◽

Growth Promoting ◽

Salinity Stress Tolerance

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Plant Growth-Promoting Rhizobacteria Enhance Salinity Stress Tolerance in Okra through ROS-Scavenging Enzymes

BioMed Research International ◽

10.1155/2016/6284547 ◽

2016 ◽

Vol 2016 ◽

pp. 1-10 ◽

Cited By ~ 144

Author(s):

Sheikh Hasna Habib ◽

Hossain Kausar ◽

Halimi Mohd Saud

Keyword(s):

Plant Growth ◽

Stress Tolerance ◽

Salinity Stress ◽

Acc Deaminase ◽

Plant Growth Promoting Rhizobacteria ◽

Antioxidant Enzyme Activities ◽

Ros Scavenging ◽

Plant Growth Promoting ◽

Growth Promoting ◽

Salinity Stress Tolerance

Salinity is a major environmental stress that limits crop production worldwide. In this study, we characterized plant growth-promoting rhizobacteria (PGPR) containing 1-aminocyclopropane-1-carboxylate (ACC) deaminase and examined their effect on salinity stress tolerance in okra through the induction of ROS-scavenging enzyme activity. PGPR inoculated okra plants exhibited higher germination percentage, growth parameters, and chlorophyll content than control plants. Increased antioxidant enzyme activities (SOD, APX, and CAT) and upregulation of ROS pathway genes (CAT, APX, GR, and DHAR) were observed in PGPR inoculated okra plants under salinity stress. With some exceptions, inoculation withEnterobactersp. UPMR18 had a significant influence on all tested parameters under salt stress, as compared to other treatments. Thus, the ACC deaminase-containing PGPR isolateEnterobactersp. UPMR18 could be an effective bioresource for enhancing salt tolerance and growth of okra plants under salinity stress.

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Production of Plant Beneficial and Antioxidants Metabolites by Klebsiella variicola under Salinity Stress

Molecules ◽

10.3390/molecules26071894 ◽

2021 ◽

Vol 26 (7) ◽

pp. 1894

Author(s):

Supriya P. Kusale ◽

Yasmin C. Attar ◽

R. Z. Sayyed ◽

Roslinda A. Malek ◽

Noshin Ilyas ◽

...

Keyword(s):

Plant Growth ◽

Salinity Stress ◽

Growth Promotion ◽

Plant Growth Promoting Rhizobacteria ◽

Beneficial Effects ◽

Wide Range ◽

Antioxidant Metabolites ◽

Plant Growth Promoting ◽

Growth Promoting ◽

And Oxidative Stress

Bacteria that surround plant roots and exert beneficial effects on plant growth are known as plant growth-promoting rhizobacteria (PGPR). In addition to the plant growth-promotion, PGPR also imparts resistance against salinity and oxidative stress and needs to be studied. Such PGPR can function as dynamic bioinoculants under salinity conditions. The present study reports the isolation of phytase positive multifarious Klebsiella variicola SURYA6 isolated from wheat rhizosphere in Kolhapur, India. The isolate produced various plant growth-promoting (PGP), salinity ameliorating, and antioxidant traits. It produced organic acid, yielded a higher phosphorous solubilization index (9.3), maximum phytase activity (376.67 ± 2.77 U/mL), and copious amounts of siderophore (79.0%). The isolate also produced salt ameliorating traits such as indole acetic acid (78.45 ± 1.9 µg/mL), 1 aminocyclopropane-1-carboxylate deaminase (0.991 M/mg/h), and exopolysaccharides (32.2 ± 1.2 g/L). In addition to these, the isolate also produced higher activities of antioxidant enzymes like superoxide dismutase (13.86 IU/mg protein), catalase (0.053 IU/mg protein), and glutathione oxidase (22.12 µg/mg protein) at various salt levels. The isolate exhibited optimum growth and maximum secretion of these metabolites during the log-phase growth. It exhibited sensitivity to a wide range of antibiotics and did not produce hemolysis on blood agar, indicative of its non-pathogenic nature. The potential of K. variicola to produce copious amounts of various PGP, salt ameliorating, and antioxidant metabolites make it a potential bioinoculant for salinity stress management.

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Growth promotion and yield enhancement of barley cultivars using ACC deaminase producing Pseudomonas fluorescens strains under salt stress

Spanish Journal of Agricultural Research ◽

10.5424/sjar/2019171-13828 ◽

2019 ◽

Vol 17 (1) ◽

pp. e0801 ◽

Cited By ~ 3

Author(s):

Mitra Azadikhah ◽

Fatemeh Jamali ◽

Hamid-Reza Nooryazdan ◽

Fereshteh Bayat

Keyword(s):

Salt Stress ◽

Plant Growth ◽

Salinity Stress ◽

Acc Deaminase ◽

Plant Growth Promoting Rhizobacteria ◽

Growth And Yield ◽

Salt Tolerant ◽

Barley Cultivars ◽

Plant Growth Promoting ◽

Growth Promoting

Plant growth-promoting rhizobacteria containing 1-aminocyclopropane-1-carboxylate (ACC) deaminase enzyme reduce the level of stress, ethylene and stimulate plant growth under various biotic and abiotic stress conditions. The present study aims at characterizing efficient salt-tolerant, ACC deaminase containing Pseudomonas fluorescens strains with plant growth-promoting activity isolated from the rhizosphere of barley plants and evaluating the influence of potent plant growth-promoting rhizobacteria (PGPR) isolates on growth and yield of five barley cultivars under salinity stress. Plant growth and yield in barley cultivars following inoculation with salt-tolerant, ACC deaminase producing PGPR strains under salt stress were quantified. Results indicated that under various levels of salinity (50, 100 and 150 mM NaCl) inoculation with PGPRs had positive impact on growth parameters and yield of barley cultivars including plant height, spike length, weight and number, peduncle length, number of grains per spike, 1000-grain weight and grain yield, comparing to uninoculated control plants under salinity stress. Inoculation of barley cultivars with bacteria ameliorated the negative effects of salinity and resulted in increase in growth and yield. Besides, as the salinity levels increased, growth and yield of barley cultivars decreased; however, cultivars showed different responses to salt stress. This study demonstrates the vital role of rhizobacteria containing ACC deaminase for increasing salt tolerance and consequently improving the growth and yield of barley plants under salinity stress.

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