Plant Growth Promoting and Stress Mitigating Abilities of Soil Born Microorganisms

2020 ◽  
Vol 11 (2) ◽  
pp. 96-104 ◽  
Author(s):  
Shahid Ali ◽  
Linan Xie
Keyword(s):  
Plant Growth ◽  
Abiotic Stresses ◽  
Developmental Stages ◽  
Crop Yields ◽  
Abiotic Stress Tolerance ◽  
Acc Deaminase ◽  
Crop Productivity ◽  
Disease Suppression ◽  
Extreme Condition ◽  
World Population

Abiotic stresses affect the plant growth in different ways and at different developmental stages that reduce the crop yields. The increasing world population continually demands more crop yields; therefore it is important to use low-cost technologies against abiotic stresses to increase crop productivity. Soil microorganisms survive in the soil associated with plants in extreme condition. It was demonstrated that these beneficial microorganisms promote plant growth and development under various stresses. The soil microbes interact with the plant through rhizospheric or endophytic association and promote the plant growth through different processes such as nutrients mobilization, disease suppression, and hormone secretions. The microorganisms colonized in the rhizospheric region and imparted the abiotic stress tolerance by producing 1-aminocyclopropane-1- carboxylate (ACC) deaminase, antioxidant, and volatile compounds, inducing the accumulation of osmolytes, production of exopolysaccharide, upregulation or downregulation of stress genes, phytohormones and change the root morphology. A large number of these rhizosphere microorganisms are now patented. In the present review, an attempt was made to throw light on the mechanism of micro-organism that operates during abiotic stresses and promotes plant survival and productivity.

scholarly journals Revisiting Sulphur—The Once Neglected Nutrient: It’s Roles in Plant Growth, Metabolism, Stress Tolerance and Crop Production

Agriculture ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 626
Author(s):  
Tinashe Zenda ◽  
Songtao Liu ◽  
Anyi Dong ◽  
Huijun Duan
Keyword(s):  
Plant Growth ◽  
Abiotic Stresses ◽  
Crop Production ◽  
Production Systems ◽  
Crop Productivity ◽  
Plant Phenotyping ◽  
Special Importance ◽  
Nutrient Deficiencies ◽  
Sulphur Nutrition ◽  
Physiological Processes

Sulphur plays crucial roles in plant growth and development, with its functions ranging from being a structural constituent of macro-biomolecules to modulating several physiological processes and tolerance to abiotic stresses. In spite of these numerous sulphur roles being well acknowledged, agriculture has paid scant regard for sulphur nutrition, until only recently. Serious problems related to soil sulphur deficiencies have emerged and the intensification of food, fiber, and animal production is escalating to feed the ever-increasing human population. In the wake of huge demand for high quality cereal and vegetable diets, sulphur can play a key role in augmenting the production, productivity, and quality of crops. Additionally, in light of the emerging problems of soil fertility exhaustion and climate change-exacerbated environmental stresses, sulphur assumes special importance in crop production, particularly under intensively cropped areas. Here, citing several relevant examples, we highlight, in addition to its plant biological and metabolism functions, how sulphur can significantly enhance crop productivity and quality, as well as acclimation to abiotic stresses. By this appraisal, we also aim to stimulate readers interests in crop sulphur research by providing priorities for future pursuance, including bettering our understanding of the molecular processes and dynamics of sulphur availability and utilization in plants, dissecting the role of soil rhizospherical microbes in plant sulphur transformations, enhancing plant phenotyping and diagnosis for nutrient deficiencies, and matching site-specific crop sulphur demands with fertilizer amendments in order to reduce nutrient use inefficiencies in both crop and livestock production systems. This will facilitate the proper utilization of sulphur in crop production and eventually enhance sustainable and environmentally friend food production.

scholarly journals Down-Regulation of SlGRAS10 in Tomato Confers Abiotic Stress Tolerance

Genes ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 623
Author(s):  
Sidra Habib ◽  
Yee Yee Lwin ◽  
Ning Li
Keyword(s):  
Salt Stress ◽  
Abiotic Stress ◽  
Plant Growth ◽  
Stress Tolerance ◽  
Abiotic Stresses ◽  
Abiotic Stress Tolerance ◽  
Functional Characterization ◽  
Flavonoid Biosynthesis ◽  
Ros Scavenging ◽  
Down Regulation

Adverse environmental factors like salt stress, drought, and extreme temperatures, cause damage to plant growth, development, and crop yield. GRAS transcription factors (TFs) have numerous functions in biological processes. Some studies have reported that the GRAS protein family plays significant functions in plant growth and development under abiotic stresses. In this study, we demonstrated the functional characterization of a tomato SlGRAS10 gene under abiotic stresses such as salt stress and drought. Down-regulation of SlGRAS10 by RNA interference (RNAi) produced dwarf plants with smaller leaves, internode lengths, and enhanced flavonoid accumulation. We studied the effects of abiotic stresses on RNAi and wild-type (WT) plants. Moreover, SlGRAS10-RNAi plants were more tolerant to abiotic stresses (salt, drought, and Abscisic acid) than the WT plants. Down-regulation of SlGRAS10 significantly enhanced the expressions of catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD) to reduce the effects of reactive oxygen species (ROS) such as O2− and H2O2. Malondialdehyde (MDA) and proline contents were remarkably high in SlGRAS10-RNAi plants. Furthermore, the expression levels of chlorophyll biosynthesis, flavonoid biosynthesis, and stress-related genes were also enhanced under abiotic stress conditions. Collectively, our conclusions emphasized the significant function of SlGRAS10 as a stress tolerate transcription factor in a certain variety of abiotic stress tolerance by enhancing osmotic potential, flavonoid biosynthesis, and ROS scavenging system in the tomato plant.

scholarly journals Microalgal Biostimulants and Biofertilisers in Crop Productions

Agronomy ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 192 ◽  
Author(s):  
Domenico Ronga ◽  
Elisa Biazzi ◽  
Katia Parati ◽  
Domenico Carminati ◽  
Elio Carminati ◽  
...  
Keyword(s):  
Plant Growth ◽  
Abiotic Stresses ◽  
Crop Production ◽  
Crop Yields ◽  
Foliar Application ◽  
Crop Protection ◽  
Seed Priming ◽  
Biologically Active ◽  
Agricultural Sustainability ◽  
Natural Substances

Microalgae are attracting the interest of agrochemical industries and farmers, due to their biostimulant and biofertiliser properties. Microalgal biostimulants (MBS) and biofertilisers (MBF) might be used in crop production to increase agricultural sustainability. Biostimulants are products derived from organic material that, applied in small quantities, are able to stimulate the growth and development of several crops under both optimal and stressful conditions. Biofertilisers are products containing living microorganisms or natural substances that are able to improve chemical and biological soil properties, stimulating plant growth, and restoring soil fertility. This review is aimed at reporting developments in the processing of MBS and MBF, summarising the biologically-active compounds, and examining the researches supporting the use of MBS and MBF for managing productivity and abiotic stresses in crop productions. Microalgae are used in agriculture in different applications, such as amendment, foliar application, and seed priming. MBS and MBF might be applied as an alternative technique, or used in conjunction with synthetic fertilisers, crop protection products and plant growth regulators, generating multiple benefits, such as enhanced rooting, higher crop yields and quality and tolerance to drought and salt. Worldwide, MBS and MBF remain largely unexploited, such that this study highlights some of the current researches and future development priorities.

scholarly journals Drought and salinity stresses in barley: Consequences and mitigation strategies

2019 ◽  
pp. 810-820 ◽  
Author(s):  
Ayman EL Sabagh ◽  
Akbar Hossain ◽  
Md. Shohidul Islam ◽  
Celaleddin Barutcular ◽  
Saddam Hussain ◽  
...  
Keyword(s):  
Adverse Effect ◽  
Abiotic Stresses ◽  
Management Practices ◽  
Crop Yields ◽  
Foliar Application ◽  
Crop Productivity ◽  
Mitigation Strategies ◽  
Present Review ◽  
Plant Responses ◽  
Barley Plant

Recent trends show reductions in crop productivity worldwide due to severe climatic change. Different abiotic stresses significantly affect the growth and development of plants, leading to decreased crop yields. Salinity and drought stresses are the most common abiotic stresses, especially in arid and semi–arid regions, and are major constraints for barley production. The present review attempts to provide comprehensive information related to barley plant responses and adaptations to drought and salinity stresses, including physiological and agronomic, in order to alleviate the adverse effect of stresses in barley. These stresses reduce assimilation rates, as they decrease stomatal conductance, disrupt photosynthetic pigments, reduce gas exchange, enhance production of reactive oxygen species, and lead to decreased plant growth and productivity. This review focuses on the strategies plants use to respond and adapt to drought and salinity stress. Plants utilize a range of physiological and biochemical mechanisms such as adaptation strategies, through which the adverse effects can be mitigated. These include soil management practices, crop establishment, as well as foliar application of anti-oxidants and growth regulators that maintain an appropriate level of water in the leaves to facilitate adjustment of osmotic and stomatal performance. The present review highlighted the adverse effect of drought and salinity stresses barley and their mitigation strategies for sustainable barley production under changing climate. They review also underscored that exogenous application of different antioxidants could play a significant role in the alleviation of salinity and drought stress in plant systems.

scholarly journals Interactive Role of Silicon and Plant–Rhizobacteria Mitigating Abiotic Stresses: A New Approach for Sustainable Agriculture and Climate Change

Plants ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1055
Author(s):  
Krishan K. Verma ◽  
Xiu-Peng Song ◽  
Dong-Mei Li ◽  
Munna Singh ◽  
Vishnu D. Rajput ◽  
...  
Keyword(s):  
Plant Growth ◽  
Abiotic Stresses ◽  
Crop Production ◽  
Plant Growth Promoting Rhizobacteria ◽  
Crop Productivity ◽  
Agricultural Crop ◽  
Plant Growth Promoting ◽  
Microbe Interactions ◽  
Stimulate Plant Growth ◽  
Excess Quantity

Abiotic stresses are the major constraints in agricultural crop production across the globe. The use of some plant–microbe interactions are established as an environment friendly way of enhancing crop productivity, and improving plant development and tolerance to abiotic stresses by direct or indirect mechanisms. Silicon (Si) can also stimulate plant growth and mitigate environmental stresses, and it is not detrimental to plants and is devoid of environmental contamination even if applied in excess quantity. In the present review, we elaborate the interactive application of Si and plant growth promoting rhizobacteria (PGPRs) as an ecologically sound practice to increase the plant growth rate in unfavorable situations, in the presence of abiotic stresses. Experiments investigating the combined use of Si and PGPRs on plants to cope with abiotic stresses can be helpful in the future for agricultural sustainability.

scholarly journals In Vitro Screening for Abiotic Stress Tolerance in Potent Biocontrol and Plant Growth Promoting Strains of Pseudomonas and Bacillus spp.

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
G. Praveen Kumar ◽  
S. K. Mir Hassan Ahmed ◽  
Suseelendra Desai ◽  
E. Leo Daniel Amalraj ◽  
Abdul Rasul
Keyword(s):  
Plant Growth ◽  
Stress Tolerance ◽  
Abiotic Stresses ◽  
Abiotic Stress Tolerance ◽  
Plant Diseases ◽  
Growth Enhancement ◽  
Bacterial Strains ◽  
End User ◽  
Plant Growth Promoting ◽  
Growth Promoting

Plant growth promoting rhizobacteria (PGPR) has been identified as a group of microbes that are used for plant growth enhancement and biocontrol for management of plant diseases. The inconsistency in performance of these bacteria from laboratory to field conditions is compounded due to the prevailing abiotic stresses in the field. Therefore, selection of bacterial strains with tolerance to abiotic stresses would benefit the end-user by successful establishment of the strain for showing desired effects. In this study we attempted to isolate and identify strains of Bacillus and Pseudomonas spp. with stress tolerance and proven ability to inhibit the growth of potential phytopathogenic fungi. Screening of bacterial strains for high temperature (50°C), salinity (7% NaCl), and drought (−1.2 MPa) showed that stress tolerance was pronounced less in Pseudomonas isolates than in Bacillus strains. The reason behind this could be the formation of endospores by Bacillus isolates. Tolerance to drought was high in Pseudomonas strains than the other two stresses. Three strains, P8, P20 and P21 showed both salinity and temperature tolerance. P59 strain possessed promising antagonistic activity and drought tolerance. The magnitude of antagonism shown by Bacillus isolates was also higher when compared to Pseudomonas strains. To conclude, identification of microbial candidate strains with stress tolerance and other added characteristic features would help the end-user obtain the desired beneficial effects.

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 Overexpression of 1-Aminocyclopropane-1-Carboxylic Acid Deaminase (acdS) Gene in Petunia hybrida Improves Tolerance to Abiotic Stresses

2021 ◽  
Vol 12 ◽  
Author(s):  
Aung Htay Naing ◽  
Hui Yeong Jeong ◽  
Sung Keun Jung ◽  
Chang Kil Kim
Keyword(s):  
Carboxylic Acid ◽  
Plant Growth ◽  
Stress Tolerance ◽  
Ethylene Production ◽  
Abiotic Stresses ◽  
Petunia Hybrida ◽  
Ornamental Plants ◽  
Acc Oxidase ◽  
Acc Deaminase ◽  
Ethylene Biosynthesis

Abiotic stress induces the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC) in plants, which consequently enhances ethylene production and inhibits plant growth. The bacterial ACC deaminase enzyme encoded by the acdS gene reduces stress-induced ethylene production and improves plant growth in response to stress. In this study, overexpression of acdS in Petunia hybrida (‘Mirage Rose’) significantly reduced expression of the ethylene biosynthesis gene ACC oxidase 1 (ACO1) and ethylene production relative to those in wild type (WT) under various abiotic stresses (cold, drought, and salt). The higher reduction of stress-induced ethylene in the transgenic plants, which was due to the overexpression of acdS, led to a greater tolerance to the stresses compared to that in the WT plants. The greater stress tolerances were proven based on better plant growth and physiological performance, which were linked to stress tolerance. Moreover, expression analysis of the genes involved in stress tolerance also supported the increased tolerance of transgenics relative to that with the WT. These results suggest the possibility that acdS is overexpressed in ornamental plants, particularly in bedding plants normally growing outside the environment, to overcome the deleterious effect of ethylene on plant growth under different abiotic stresses. The development of stress-tolerant plants will be helpful to advance the floricultural industry.

scholarly journals Maize breeding for abiotic stress tolerance: An alternative to face climate changes

2021 ◽  
Vol 6 ◽  
pp. 1-13
Author(s):  
Tiago Corazza da Rosa ◽  
Ivan Ricardo Carvalho ◽  
Danieli Jacoboski Hutra ◽  
Leonardo Cesar Bradebon ◽  
Marlon Vinícius da Rosa Sarturi ◽  
...  
Keyword(s):  
Abiotic Stresses ◽  
Abiotic Stress Tolerance ◽  
Molecular Techniques ◽  
World Population ◽  
Maize Breeding ◽  
Great Expectations ◽  
Maize Production ◽  
Maize Genotypes ◽  
Essential Knowledge ◽  
Breeding Techniques

Maize breeding faces several challenges when the matter is abiotic stresses. For many years, the focus was to develop genotypes adapted to optimal environmental conditions, however, the need to ensure yields under unsuitable and unstable conditions of a climate-changing world is undeniable. Therefore, this review is addressed to the main abiotic stresses that jeopardize maize production worldwide, presenting an overview regarding losses and impacts imposed by them, stating what has been achieved through conventional and molecular plant breeding techniques, and the future prospects on this subject. The conventional breeding added to molecular techniques bring great expectations for developing abiotic stresses tolerant maize genotypes. Universities and research companies worldwide have contributed to expand and spread basic and essential knowledge, however, the entrance of large multinational companies might revolutionize the field. Genetic modified hybrids and projects of continental coverage will introduce many innovations and alternatives to ensure food security for the increasingly growing world population. 

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

2021 ◽  
Vol 22 (21) ◽  
pp. 11461
Author(s):  
Dhanashree Vijayrao Bomle ◽  
Asha Kiran ◽  
Jeevitha Kodihalli Kumar ◽  
Lavanya Senapathyhalli Nagaraj ◽  
Chamanahalli Kyathegowda Pradeep ◽  
...  
Keyword(s):  
Plant Growth ◽  
Salinity Stress ◽  
Crop Yields ◽  
Agricultural Practices ◽  
Acc Deaminase ◽  
Plant Growth Promoting Rhizobacteria ◽  
Difficult Situation ◽  
Wide Range ◽  
The Impact ◽  
Seed Biopriming

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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