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Yasmeen T, Arif MS, Tariq M, Akhtar S, Syrish A, Haidar W, Rizwan M, Hussain MI, Ahmad A, Ali S. Biofilm producing plant growth promoting bacteria in combination with glycine betaine uplift drought stress tolerance of maize plant. FRONTIERS IN PLANT SCIENCE 2024; 15:1327552. [PMID: 38405588 PMCID: PMC10884199 DOI: 10.3389/fpls.2024.1327552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Accepted: 01/05/2024] [Indexed: 02/27/2024]
Abstract
Introduction The escalating threat of drought poses a significant challenge to sustainable food production and human health, as water scarcity adversely impacts various aspects of plant physiology. Maize, a cornerstone in staple cereal crops, faces the formidable challenge of drought stress that triggers a series of transformative responses in the plant. Methods The present study was carried out in two sets of experiments. In first experiment, drought stress was applied after maintaining growth for 45 days and then irrigation was skipped, and plant samples were collected at 1st, 3rd and 6th day of drought interval for evaluation of changes in plant growth, water relation (relative water content) and antioxidants activity by inoculating indigenously isolated drought tolerant biofilm producing rhizobacterial isolates (Bacillus subtilis SRJ4, Curtobacterium citreum MJ1). In the second experiment, glycine betaine was applied as osmoregulator in addition to drought tolerant PGPR to perceive modulation in photosynthetic pigments (Chlorophyll a and b) and plant growth under varying moisture stress levels (100, 75 and 50% FC). Results and discussion Results of the study revealed upsurge in root and shoot length, fresh and dry biomass of root and shoot besides increasing chlorophyll contents in water stressed inoculated plants compared to uninoculated plants. Glycine betaine application resulted in an additional boost to plant growth and photosynthetic pigments, when applied in combination with bacterial inoculants. However, both bacterial inoculants behaved differently under drought stress as evident from their biochemical and physiological attributes. Isolate SRJ4 proved to be superior for its potential to express antioxidant activity, leaf water potential and relative water contents and drought responsive gene expression while isolate MJ1 showed exclusive increase in root dry biomass and plant P contents. Though it is quite difficult to isolate the bacterial isolates having both plant growth promoting traits and drought tolerance together yet, such biological resources could be an exceptional option to be applied for improving crop productivity and sustainable agriculture under abiotic stresses. By exploring the combined application of PGPR and glycine betaine, the study seeks to provide insights into potential strategies for developing sustainable agricultural practices aimed at improving crop resilience under challenging environmental conditions.
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Affiliation(s)
- Tahira Yasmeen
- Department of Environmental Sciences, Government College University Faisalabad, Faisalabad, Pakistan
| | - Muhammad Saleem Arif
- Department of Environmental Sciences, Government College University Faisalabad, Faisalabad, Pakistan
| | - Mohsin Tariq
- Department of Bioinformatics and Biotechnology, Government College University Faisalabad, Faisalabad, Pakistan
| | - Sadia Akhtar
- Department of Environmental Sciences, Government College University Faisalabad, Faisalabad, Pakistan
| | - Afira Syrish
- Department of Environmental Sciences, Government College University Faisalabad, Faisalabad, Pakistan
| | - Waqas Haidar
- Department of Environmental Sciences, Government College University Faisalabad, Faisalabad, Pakistan
| | - Muhammad Rizwan
- Department of Environmental Sciences, Government College University Faisalabad, Faisalabad, Pakistan
| | | | - Ajaz Ahmad
- Department of Clinical Pharmacy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Shafaqat Ali
- Department of Environmental Sciences, Government College University Faisalabad, Faisalabad, Pakistan
- Department of Biological Sciences and Technology, China Medical University, Taichung, Taiwan
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Chieb M, Gachomo EW. The role of plant growth promoting rhizobacteria in plant drought stress responses. BMC PLANT BIOLOGY 2023; 23:407. [PMID: 37626328 PMCID: PMC10464363 DOI: 10.1186/s12870-023-04403-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Accepted: 08/07/2023] [Indexed: 08/27/2023]
Abstract
Climate change has exacerbated the effects of abiotic stresses on plant growth and productivity. Drought is one of the most important abiotic stress factors that interfere with plant growth and development. Plant selection and breeding as well as genetic engineering methods used to improve crop drought tolerance are expensive and time consuming. Plants use a myriad of adaptative mechanisms to cope with the adverse effects of drought stress including the association with beneficial microorganisms such as plant growth promoting rhizobacteria (PGPR). Inoculation of plant roots with different PGPR species has been shown to promote drought tolerance through a variety of interconnected physiological, biochemical, molecular, nutritional, metabolic, and cellular processes, which include enhanced plant growth, root elongation, phytohormone production or inhibition, and production of volatile organic compounds. Therefore, plant colonization by PGPR is an eco-friendly agricultural method to improve plant growth and productivity. Notably, the processes regulated and enhanced by PGPR can promote plant growth as well as enhance drought tolerance. This review addresses the current knowledge on how drought stress affects plant growth and development and describes how PGPR can trigger plant drought stress responses at the physiological, morphological, and molecular levels.
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Affiliation(s)
- Maha Chieb
- Department of Microbiology and Plant Pathology, University of California Riverside, Riverside, CA, 92507, USA
| | - Emma W Gachomo
- Department of Microbiology and Plant Pathology, University of California Riverside, Riverside, CA, 92507, USA.
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Jain R, Saraf M. ACC deaminase producing PGPR modulates nutrients uptake, soil properties and growth of cluster bean (Cyamopsis tetragonoloba L.) under deficit irrigation. Biologia (Bratisl) 2023. [DOI: 10.1007/s11756-023-01376-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
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Vaghela N, Gohel S. Medicinal plant-associated rhizobacteria enhance the production of pharmaceutically important bioactive compounds under abiotic stress conditions. J Basic Microbiol 2023; 63:308-325. [PMID: 36336634 DOI: 10.1002/jobm.202200361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 09/15/2022] [Accepted: 10/22/2022] [Indexed: 11/09/2022]
Abstract
Interest in cultivating valuable medicinal plants to collect bioactive components has risen extensively over the world to meet the demands of health care systems, pharmaceuticals, and food businesses. Farmers commonly use chemical fertilizers to attain maximal biomass and yield, which have negative effects on the growth, development, and bioactive constituents of such medicinally important plants. Because of its low cost, environmentally friendly behavior, and nondestructive impact on soil fertility, plant health, and human health, the use of beneficial rhizobial microbiota is an alternative strategy for increasing the production of useful medicinal plants under both standard and stressed conditions. Plant growth-promoting rhizobacteria (PGPR) associated with medicinal plants belong to the genera Azotobacter, Acinetobacter, Bacillus, Brevibacterium, Burkholderia, Exiguobacterium, Pseudomonas, Pantoea, Mycobacterium, Methylobacterium, and Serratia. These microbes enhance plant growth parameters by producing secondary metabolites, including enzymes and antibiotics, which help in nutrient uptake, enhance soil fertility, improve plant growth, and protect against plant pathogens. The role of PGPR in the production of biomass and their effect on the quality of bioactive compounds (phytochemicals) is described in this review. Additionally, the mitigation of environmental stresses including drought stress, saline stress, alkaline stress, and flooding stress to herbal plants is illustrated.
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Affiliation(s)
- Nishtha Vaghela
- Department of Biosciences, Saurashtra University, Rajkot, Gujarat, India
| | - Sangeeta Gohel
- Department of Biosciences, Saurashtra University, Rajkot, Gujarat, India
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Ojuederie OB, Babalola OO. Growth enhancement and extenuation of drought stress in maize inoculated with multifaceted ACC deaminase producing rhizobacteria. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2023. [DOI: 10.3389/fsufs.2022.1076844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
IntroductionMaize is a major staple cereal crop grown and consumed globally. However, due to climate change, extreme heat and drought stresses are greatly affecting its production especially in sub-Saharan Africa. The use of a bio-based approach to mitigate drought stress is therefore suggested using plant growth-promoting rhizobacteria (PGPR).MethodsThis study investigated the abilities of 1-aminocyclopropane-1-carboxylate (ACC) deaminase producing PGPR Pseudomonas sp. MRBP4, Pseudomonas sp. MRBP13 and Bacillus sp. MRBP10 isolated from maize rhizosphere soil, to ameliorate the effect of drought stress in maize genotypes MR44 and S0/8/W/I137TNW//CML550 under two water regimes; mild drought stress (50% FC) and well-watered conditions (100% FC). The rhizobacterial strains were identified by 16S rRNA sequencing and biochemical tests, and evaluated for plant growth-promoting and abiotic stress tolerance traits.Results and discussionThe synergistic effect of the bacterial strains had a highly significant (p < 0.001) effect on the total soluble sugar, soil moisture content and relative water content, which were enhanced under water-stress in the inoculated plants. Relative water content was significantly highest (p < 0.001) in maize plants co-inoculated with Pseudomonas sp. MRBP4 + Bacillus sp. MRBP10 (60.55%). Total chlorophyll content was significantly enhanced in maize seedlings sole inoculated with Pseudomonas sp. MRBP4, Pseudomonas sp. MRBP13, and co-inoculated with Pseudomonas sp. MRBP13 + Bacillus sp. MRBP10 by 15.91%, 14.99% and 15.75% respectively, over the un-inoculated control. Soil moisture content increased by 28.67% and 30.71% compared to the un-inoculated control when plants were inoculated with Pseudomonas sp. MRBP4 + Bacillus sp. MRBP10 and Pseudomonas sp. MRBP4 + Bacillus sp. MRBP10 respectively. The interactive effect of genotype × bacteria significantly enhanced biomass production. Leaf area was highest in maize plants co-inoculated with Pseudomonas sp. MRBP4 + Pseudomonas sp. MRBP13 (212.45 ± 0.87 cm2) under drought stress. Treatment of maize seeds with Pseudomonas sp. MRBP 4 + Pseudomonas sp. MRBP13 + Bacillus sp. MRBP10 significantly increased the root length (10.32 ± 0.48 cm) which enhanced survival of the maize seedlings. Bioinoculation of maize seeds with these strains could boost maize production cultivated in arid regions.
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Panda S, Zhou K. Engineering microbes to overproduce natural products as agrochemicals. Synth Syst Biotechnol 2022; 8:79-85. [PMID: 36514486 PMCID: PMC9731846 DOI: 10.1016/j.synbio.2022.11.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 11/12/2022] [Accepted: 11/20/2022] [Indexed: 11/29/2022] Open
Abstract
Current agricultural practices heavily rely on the excessive application of synthetic pesticides and fertilizers to meet the food demands of the increasing global population. This practice has several drawbacks including its negative impact on the environment and human health. Recently, the use of natural products has gained interest as alternatives to these synthetic agrochemicals due to their selective working mechanisms and biodegradability. In order to efficiently produce these natural agrochemicals, engineering microorganisms is emerging as an increasingly viable approach, and it is anticipated that it will have a significant market share in the near future. This approach manipulates the metabolism of microbes to manufacture the desired natural compounds from low-cost starting materials. This review discusses recent examples of this approach. The produced natural products can serve as biopesticides or plant growth regulators for the sustainable improvement of plant growth and disease control. The challenges in further developing these strategies are also discussed.
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Rizvi A, Ahmed B, Khan MS, El-Beltagi HS, Umar S, Lee J. Bioprospecting Plant Growth Promoting Rhizobacteria for Enhancing the Biological Properties and Phytochemical Composition of Medicinally Important Crops. Molecules 2022; 27:molecules27041407. [PMID: 35209196 PMCID: PMC8880754 DOI: 10.3390/molecules27041407] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 02/03/2022] [Accepted: 02/15/2022] [Indexed: 12/04/2022] Open
Abstract
Traditionally, medicinal plants have long been used as a natural therapy. Plant-derived extracts or phytochemicals have been exploited as food additives and for curing many health-related ailments. The secondary metabolites produced by many plants have become an integral part of human health and have strengthened the value of plant extracts as herbal medicines. To fulfil the demand of health care systems, food and pharmaceutical industries, interest in the cultivation of precious medicinal plants to harvest bio-active compounds has increased considerably worldwide. To achieve maximum biomass and yield, growers generally apply chemical fertilizers which have detrimental impacts on the growth, development and phytoconstituents of such therapeutically important plants. Application of beneficial rhizosphere microbiota is an alternative strategy to enhance the production of valuable medicinal plants under both conventional and stressed conditions due to its low cost, environmentally friendly behaviour and non-destructive impact on fertility of soil, plants and human health. The microbiological approach improves plant growth by various direct and indirect mechanisms involving the abatement of various abiotic stresses. Given the negative impacts of fertilizers and multiple benefits of microbiological resources, the role of plant growth promoting rhizobacteria (PGPR) in the production of biomass and their impact on the quality of bio-active compounds (phytochemicals) and mitigation of abiotic stress to herbal plants have been described in this review. The PGPR based enhancement in the herbal products has potential for use as a low cost phytomedicine which can be used to improve health care systems.
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Affiliation(s)
- Asfa Rizvi
- Department of Botany, School of Chemical and Life Sciences, Jamia Hamdard, Hamdard Nagar, New Delhi 110062, India; (A.R.); (S.U.)
| | - Bilal Ahmed
- School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Korea;
- Correspondence: (B.A.); (H.S.E.-B.)
| | - Mohammad Saghir Khan
- Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh 202002, India;
| | - Hossam S. El-Beltagi
- Agricultural Biotechnology Department, College of Agriculture and Food Sciences, King Faisal University, P.O. Box 420, Al-Ahsa 31982, Saudi Arabia
- Biochemistry Department, Faculty of Agriculture, Cairo University, Gamma St., Cairo 12613, Egypt
- Correspondence: (B.A.); (H.S.E.-B.)
| | - Shahid Umar
- Department of Botany, School of Chemical and Life Sciences, Jamia Hamdard, Hamdard Nagar, New Delhi 110062, India; (A.R.); (S.U.)
| | - Jintae Lee
- School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Korea;
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Zhou H, Ren ZH, Zu X, Yu XY, Zhu HJ, Li XJ, Zhong J, Liu EM. Efficacy of Plant Growth-Promoting Bacteria Bacillus cereus YN917 for Biocontrol of Rice Blast. Front Microbiol 2021; 12:684888. [PMID: 34354684 PMCID: PMC8329377 DOI: 10.3389/fmicb.2021.684888] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 06/09/2021] [Indexed: 11/16/2022] Open
Abstract
Bacillus cereus YN917, obtained from a rice leaf with remarkable antifungal activity against Magnaporthe oryzae, was reported in our previous study. The present study deciphered the possible biocontrol properties. YN917 strain exhibits multiple plant growth-promoting and disease prevention traits, including production of indole-3-acetic acid (IAA), ACC deaminase, siderophores, protease, amylase, cellulase, and β-1,3-glucanase, and harboring mineral phosphate decomposition activity. The effects of the strain YN917 on growth promotion and disease prevention were further evaluated under detached leaf and greenhouse conditions. The results revealed that B. cereus YN917 can promote seed germination and seedling plant growth. The growth status of rice plants was measured from the aspects of rice plumule, radicle lengths, plant height, stem width, root lengths, fresh weights, dry weights, and root activity when YN917 was used as inoculants. YN917 significantly reduced rice blast severity under detached leaf and greenhouse conditions. Genome analysis revealed the presence of gene clusters for biosynthesis of plant promotion and antifungal compounds, such as IAA, tryptophan, siderophores, and phenazine. In summary, YN917 can not only be used as biocontrol agents to minimize the use of chemical substances in rice blast control, but also can be developed as bio-fertilizers to promote the rice plant growth.
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Affiliation(s)
- Hu Zhou
- College of Plant Protection, Hunan Agricultural University, Changsha, China
- Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, Changsha, China
- Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha, China
| | - Zuo-hua Ren
- College of Plant Protection, Hunan Agricultural University, Changsha, China
- Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, Changsha, China
| | - Xue Zu
- College of Plant Protection, Hunan Agricultural University, Changsha, China
| | - Xi-yue Yu
- College of Plant Protection, Hunan Agricultural University, Changsha, China
| | - Hua-jun Zhu
- College of Plant Protection, Hunan Agricultural University, Changsha, China
| | - Xiao-juan Li
- Hunan Academy of Agricultural Sciences, Institute of Plant Protection, Changsha, China
| | - Jie Zhong
- College of Plant Protection, Hunan Agricultural University, Changsha, China
| | - Er-ming Liu
- College of Plant Protection, Hunan Agricultural University, Changsha, China
- Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, Changsha, China
- Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha, China
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Liu CH, Siew W, Hung YT, Jiang YT, Huang CH. 1-Aminocyclopropane-1-carboxylate (ACC) Deaminase Gene in Pseudomonas azotoformans Is Associated with the Amelioration of Salinity Stress in Tomato. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:913-921. [PMID: 33464897 DOI: 10.1021/acs.jafc.0c05628] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Although bacteria with 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity have been used to mitigate biotic and abiotic stresses in crops, it is not well known whether the ACC deaminase gene (acdS) in Pseudomonas azotoformans is related to the alleviation of salt stress by the bacterium. This study aimed to evaluate the effects of acdS in P. azotoformans strain CHB 1107 on the nutrient uptake and growth of tomato plants under salt stress. The acdS mutant (CHB 1107 M) of P. azotoformans CHB 1107 was obtained through bacterial conjugation. Wild-type (CHB 1107 WT) and CHB 1107 M were used to inoculate tomato plants grown in a soil or solution with an electrical conductivity of 6 dS/m adjusted by NaCl. CHB 1107 M completely lost the ability to produce ACC deaminase, whereas the complementation of acdS in CHB 1107 M preserved its ACC deaminase activity. CHB 1107 WT significantly reduced the production of ethylene and proline by tomato plants under salt stress, increasing the shoot and root dry weights of tomato plants compared with the noninoculated control and CHB 1107 M. In addition, tomato plants inoculated with CHB 1107 M showed a significant reduction in K (27.5%), Ca (23.0%), and Mn uptake (17.5%) compared with those inoculated with CHB 1107 WT. In contrast, CHB 1107 WT significantly reduced Na uptake by tomato plants in comparison to CHB 1107 M in saline soil conditions. In addition, the inoculation of tomato plants with CHB 1107 WT resulted in a higher K/Na ratio than in those inoculated with CHB 1107 M and the noninoculated control. These findings suggest that acdS in P. azotoformans is associated with the amelioration of salinity stress in tomato. Plant transformation with acdS and the field application of P. azotoformans may be used as potential management tools for crops under salt stress.
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Affiliation(s)
- Cheng-Huan Liu
- Department of Soil and Environmental Sciences, National Chung Hsing University, Taichung 402, Taiwan
| | - Wanyi Siew
- Department of Soil and Environmental Sciences, National Chung Hsing University, Taichung 402, Taiwan
| | - Yu-Ting Hung
- Department of Soil and Environmental Sciences, National Chung Hsing University, Taichung 402, Taiwan
| | - Yu-Ti Jiang
- Department of Soil and Environmental Sciences, National Chung Hsing University, Taichung 402, Taiwan
| | - Cheng-Hua Huang
- Department of Soil and Environmental Sciences, National Chung Hsing University, Taichung 402, Taiwan
- Innovation and Development Center of Sustainable Agriculture (IDCSA), National Chung Hsing University, 145 Xingda Road, South District, Taichung City 402, Taiwan
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Bacterial communities in the rhizosphere, phyllosphere and endosphere of tomato plants. PLoS One 2019; 14:e0223847. [PMID: 31703074 PMCID: PMC6839845 DOI: 10.1371/journal.pone.0223847] [Citation(s) in RCA: 94] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Accepted: 09/30/2019] [Indexed: 11/19/2022] Open
Abstract
Plants harbor diverse bacterial communities, which play crucial roles in plant health and growth, in their rhizosphere, phyllosphere and endosphere. Tomato is an important model for studying plant-microbe interactions, but comparison of its associated bacterial community is still lacking. In this study, using Illumina sequencing of 16S rRNA amplicons, we characterized and compared the bacterial size and community from rootzone soil as well as the rhizosphere, phyllosphere and endosphere of roots, stems, leaves, fruits and seeds of tomato plants that were grown in greenhouse conditions. Habitat (soil, phyllospheric, and endophytic) structured the community. The bacterial communities from the soil-type samples (rootzone soil and rhizosphere) showed the highest richness and diversity. The lowest bacterial diversity occurred in the phyllospheric samples, while the lowest richness occurred in the endosphere. Among the endophytic samples, both bacterial diversity and richness varied in different tissues, with the highest values in roots. The most abundant phyla in the tomato-associated community was Proteobacteria, with the exception of the seeds and jelly, where both Proteobacteria and Firmicutes were dominant. At the genus level, the sequences of Pseudomonas and Acinetobacter were prevalent in the rhizosphere, and in the phyllosphere, more than 97% of the sequences were assigned to Acinetobacter. For the endophytes, Acinetobacter, Enterobacter, and Pseudomonas were the abundant genera in the roots, stems and leaves. In the fruits, the bacterial endophytes varied in different compartments, with Enterobacter being enriched in the pericarp and seeds, Acinetobacter in the placenta, and Weissella in the jelly. The present data provide a comprehensive description of the tomato-associated bacterial community and will be useful for better understanding plant-microbe interactions and selecting suitable bacterial taxa for tomato production.
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Dahiya A, Sharma R, Sindhu S, Sindhu SS. Resource partitioning in the rhizosphere by inoculated Bacillus spp. towards growth stimulation of wheat and suppression of wild oat ( Avena fatua L.) weed. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2019; 25:1483-1495. [PMID: 31736550 PMCID: PMC6825098 DOI: 10.1007/s12298-019-00710-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 08/22/2019] [Accepted: 08/28/2019] [Indexed: 05/28/2023]
Abstract
Common wheat (Triticum aestivum L.) is one of the most important agricultural crop, which provides direct source of food for humans. Besides abiotic stresses, weeds pose a significant challenge to successful crop production. Avena fatua (wild oat) is one of the most common damaging grass weed, which causes 17-62% losses in yield of winter wheat. Excessive use of herbicides to control wild oat has resulted in serious environmental and human health hazards. Therefore, biological control of weeds is required to cope up with the increasing food demand and to attain self-sustainability. In this study, eighty eight rhizobacterial isolates were isolated from rhizosphere soil samples collected from Rewari and Hisar districts. After screening of the isolates, only thirty isolates showed in vitro antagonistic and herbicidal activities. The selected antagonistic isolates were further tested for production of IAA and ALA, and utilization of ACC. Bacterial isolates BWA18 and RWA52 produced 53.80 and 19.18 ug ml-1 IAA, respectively and high ALA production was shown by isolates HCA3 and RCA3. Five isolates i.e., BWA20, BWA23, BWA29, BWA38 and RCA3 showed significant ACC utilization. Inoculation of selected bacterial isolates BWA18, RWA69 and SYB101 showed significant increase in root dry weight (RDW) and shoot dry weight (SDW) of wheat plants under pot house conditions, and decreased RDW and SDW of A. fatua weed as compared to RDF-amended uninoculated soil at 25 DAS (days after sowing). Bacterial isolates RWA69 and SYB101 caused significant increase in RDW and SDW of wheat growth at 50 DAS, whereas their inoculation decreased RDW and SDW of A. fatua. Thus, seed bacterization with bacterial isolates RWA52, RWA69 and SYB101 caused significant increase in RDW and SDW of wheat, whereas their inoculation caused significant decrease in RDW and SDW of A. fatua. The best performing bacterial isolates RWA52 and RWA69 were identified as Bacillus siamensis and Bacillus endophyticus using 16S rRNA analysis. The promising rhizobacterial isolates could further be tested for the bioherbicidal activity and plant growth promotion effects under field conditions before their use as bioherbicides.
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Affiliation(s)
- Anupma Dahiya
- Department of Microbiology, CCS Haryana Agricultural University, Hisar, Haryana 125004 India
| | - Ruchi Sharma
- Department of Microbiology, CCS Haryana Agricultural University, Hisar, Haryana 125004 India
| | - Swati Sindhu
- Department of Microbiology, CCS Haryana Agricultural University, Hisar, Haryana 125004 India
| | - Satyavir S. Sindhu
- Department of Microbiology, CCS Haryana Agricultural University, Hisar, Haryana 125004 India
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Chandra D, Srivastava R, Gupta VVSR, Franco CMM, Sharma AK. Evaluation of ACC-deaminase-producing rhizobacteria to alleviate water-stress impacts in wheat ( Triticum aestivum L.) plants. Can J Microbiol 2019; 65:387-403. [PMID: 30702926 DOI: 10.1139/cjm-2018-0636] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Application of plant-growth-promoting rhizobacteria (PGPR) is an environmentally sustainable option to reduce the effects of abiotic and biotic stresses on plant growth and productivity. Bacteria isolated from rain-fed agriculture field soils in the Central Himalaya Kumaun region, India, were evaluated for the production of 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase. Those producing ACC deaminase in high amounts were evaluated for their potential to improve wheat (Triticum aestivum L.) plant growth under irrigated and water-stress conditions in two glasshouse experiments. Some of the isolates also showed other plant-growth-promoting (PGP) traits, e.g., N2 fixation, siderophore production, and phosphate solubilization; however, strains with higher ACC deaminase activity showed the greatest effects. These were Variovorax paradoxus RAA3; Pseudomonas spp. DPC12, DPB13, DPB15, DPB16; Achromobacter spp. PSA7, PSB8; and Ochrobactrum anthropi DPC9. In both simulated irrigated and water-stress conditions, a single inoculation of RAA3 and a consortium of DPC9 + DPB13 + DPB15 + DPB16 significantly improved wheat plant growth and foliar nutrient concentrations and caused significant positive changes in antioxidant properties compared with noninoculated plants especially under water stress. These findings imply that PGPB having ACC deaminase activity together with other PGP traits could potentially be effective inoculants to improve the growth of wheat plants in water-stressed rain-fed environments.
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Affiliation(s)
- Dinesh Chandra
- a Department of Biological Sciences, CBS&H, G.B. Pant University of Agriculture and Technology, Pantnagar-263 145, U.S. Nagar, Uttarakhand, India
| | - Rashmi Srivastava
- a Department of Biological Sciences, CBS&H, G.B. Pant University of Agriculture and Technology, Pantnagar-263 145, U.S. Nagar, Uttarakhand, India
| | - Vadakattu V S R Gupta
- b CSIRO Agriculture and Food, Locked bag 2, Waite Campus, Glen Osmond, SA 5064, Australia.,c Department of Medical Biotechnology, Flinders University, Bedford Park, SA 5042, Australia
| | - Christopher M M Franco
- c Department of Medical Biotechnology, Flinders University, Bedford Park, SA 5042, Australia
| | - Anil Kumar Sharma
- a Department of Biological Sciences, CBS&H, G.B. Pant University of Agriculture and Technology, Pantnagar-263 145, U.S. Nagar, Uttarakhand, India
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Menendez E, Garcia-Fraile P. Plant probiotic bacteria: solutions to feed the world. AIMS Microbiol 2017; 3:502-524. [PMID: 31294173 PMCID: PMC6604988 DOI: 10.3934/microbiol.2017.3.502] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 06/12/2017] [Indexed: 01/10/2023] Open
Abstract
The increasing human population expected in the next decades, the growing demand of livestock products-which production requires higher amounts of feed products fabrication, the collective concern about food quality in industrialized countries together with the need to protect the fertility of soils, in particular, and the environment, in general, constitute as a whole big challenge that worldwide agriculture has to face nowadays. Some soil bacteria harbor mechanisms to promote plant growth, which include phytostimulation, nutrient mobilization, biocontrol of plant pathogens and abiotic stresses protection. These bacteria have also been proved as promoters of vegetable food quality. Therefore, these microbes, also so-called Plant Probiotic Bacteria, applied as biofertilizers in crop production, constitute an environmental friendly manner to contribute to produce the food and feed needed to sustain world population. In this review, we summarize some of the best-known mechanisms of plant probiotic bacteria to improve plant growth and develop a more sustainable agriculture.
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Affiliation(s)
- Esther Menendez
- Instituto de Ciências Agrárias e Ambientais Mediterrânicas (ICAAM), Universidade de Évora, Évora, Portugal
| | - Paula Garcia-Fraile
- Laboratory of Fungal Genetics and Metabolism, Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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