A Mix of Agrobacterium Strains Reduces Nitrogen Fertilization While Enhancing Economic Returns in Field Trials with Durum Wheat in Contrasting ... View Full Text


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Article Info

DATE

2022-08-09

AUTHORS

Soumaya Tounsi-Hammami, Zied Hammami, Sana Dhane-Fitouri, Christine Le Roux, Faysal Ben Jeddi

ABSTRACT

Today, using plant growth–promoting rhizobacteria is an important eco-friendly management approach for improving crop productivity. This study aimed to select efficient native rhizobia from white lupin nodules and assess their potential for improving the production and economic returns of Triticum turgidum spp. durum L. var. Razzek under field conditions in arid and semi-arid environments affected by salinity and drought stress. Seventy-two strains were assessed for their plant growth-promoting activities. Of them, three compatible strains of Agrobacterium spp. were selected and used individually and in mixes. The efficiency of seven inocula applied to the soil was assessed in a pot experiment at varying levels of synthetic nitrogen fertilization (0, 50, and 100%N). The experiment was set up in a completely randomized design with four replications. At the flowering stage plant height, flag leaf area, shoot dry weight, leaf chlorophyll content, chlorophyll fluorescence, and the normalized difference vegetation index were estimated. Subsequently, the most efficient inoculant was tested in a field trial under four different agro-environmental conditions contrasting in terms of salt and drought stress, respecting the same N fertilization rates and experimental design, with three replications. Yield components, nitrogen (N) and phosphorus (P) contents, and economic returns were estimated at harvest time. In the pot experiment, a combined application of the mix of three Agrobacterium spp. at 50%N proved to be the best treatment ensuring the highest values for all the measured parameters, which were statistically similar or higher than those recorded in uninoculated plants receiving 100%N. Field inoculation trials confirmed the results obtained in the pot experiment. In non-stressed environments, application of the bacterial mix at 50%N was as effective as the 100%N treatment. Meanwhile, under drought and salt stress conditions, the same treatment significantly increased grain yield by 33 to 42% and straw yield by 13 to 22% compared to uninoculated plants at 100%N. Furthermore, this treatment significantly enhanced N and P contents in wheat straw and grain in stressed environments. An economic analysis revealed that application of the selected mix with 50%N increased net-returns per hectare, ensuring a financial gain ranging from 26 to 106% compared to the control plants receiving a full N dose. The positive effect of the native Agrobacterium sp. mix on growth, yield, nutrition, and economic returns of durum wheat var. Razzek, when combined with 50%N, was proved for the first time. However, future studies should now focus on examining the behavior of this mix with other durum wheat varieties. More... »

PAGES

1-18

References to SciGraph publications

  • 2014-01-21. Indole-3-acetic acid in plant–microbe interactions in ANTONIE VAN LEEUWENHOEK
  • 2021-07-25. Photosynthetic responses of durum wheat to chemical/microbiological fertilization management under salt and drought stresses in ACTA PHYSIOLOGIAE PLANTARUM
  • 2019-07-15. Isolation, identification and plant growth promotion ability of endophytic bacteria associated with lupine root nodule grown in Tunisian soil in ARCHIVES OF MICROBIOLOGY
  • 2009-08-01. Evaluating the Potential of Forest Species Under “Microbial Management” for the Restoration of Degraded Mining Areas in WATER, AIR, & SOIL POLLUTION
  • 2011-06-23. Influence of nitrogen fertilisation on pasture culturable rhizobacteria occurrence and the role of environmental factors on their potential PGPR activities in BIOLOGY AND FERTILITY OF SOILS
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  • 2017-03-12. Plant growth promoting rhizobacteria are more effective under drought: a meta-analysis in PLANT AND SOIL
  • 2011-02-11. Identification of multi-trait PGPR isolates and evaluating their potential as inoculants for wheat in ANNALS OF MICROBIOLOGY
  • 2019-01-23. Combined application of biochar and PGPR consortia for sustainable production of wheat under semiarid conditions with a reduced dose of synthetic fertilizer in BRAZILIAN JOURNAL OF MICROBIOLOGY
  • 2019-03-06. The stimulatory effects of plant growth promoting rhizobacteria and plant growth regulators on wheat physiology grown in sandy soil in ARCHIVES OF MICROBIOLOGY
  • 2009-08-21. Induction of Plant Tolerance to Semi-arid Environments by Beneficial Soil Microorganisms – A Review in CLIMATE CHANGE, INTERCROPPING, PEST CONTROL AND BENEFICIAL MICROORGANISMS
  • 2019-10-31. Effect of the inoculation of plant growth-promoting rhizobacteria on the photosynthetic characteristics of Sambucus williamsii Hance container seedlings under drought stress in AMB EXPRESS
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  • 2013-11-30. Drought stress amelioration in wheat through inoculation with Burkholderia phytofirmans strain PsJN in PLANT GROWTH REGULATION
  • 2019-05-29. Occurrence of diverse Bradyrhizobium spp. in roots and rhizospheres of two commercial Brazilian sugarcane cultivars in BRAZILIAN JOURNAL OF MICROBIOLOGY
  • 2010-08-28. Soil beneficial bacteria and their role in plant growth promotion: a review in ANNALS OF MICROBIOLOGY
  • 2021-09-28. Comparative Effects of Individual and Consortia Plant Growth Promoting Bacteria on Physiological and Enzymatic Mechanisms to Confer Drought Tolerance in Maize (Zea mays L.) in JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION
  • 2019-07-17. PGPR Characterization of Non-Nodulating Bacterial Endophytes from Root Nodules of Vigna unguiculata (L.) Walp. in MICROBIAL PROBIOTICS FOR AGRICULTURAL SYSTEMS
  • 2011-11-19. Plant growth promoting activity of an auxin and siderophore producing isolate of Streptomyces under saline soil conditions in WORLD JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY
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    28 schema:description Abstract Today, using plant growth–promoting rhizobacteria is an important eco-friendly management approach for improving crop productivity. This study aimed to select efficient native rhizobia from white lupin nodules and assess their potential for improving the production and economic returns of Triticum turgidum spp. durum L. var. Razzek under field conditions in arid and semi-arid environments affected by salinity and drought stress. Seventy-two strains were assessed for their plant growth-promoting activities. Of them, three compatible strains of Agrobacterium spp. were selected and used individually and in mixes. The efficiency of seven inocula applied to the soil was assessed in a pot experiment at varying levels of synthetic nitrogen fertilization (0, 50, and 100%N). The experiment was set up in a completely randomized design with four replications. At the flowering stage plant height, flag leaf area, shoot dry weight, leaf chlorophyll content, chlorophyll fluorescence, and the normalized difference vegetation index were estimated. Subsequently, the most efficient inoculant was tested in a field trial under four different agro-environmental conditions contrasting in terms of salt and drought stress, respecting the same N fertilization rates and experimental design, with three replications. Yield components, nitrogen (N) and phosphorus (P) contents, and economic returns were estimated at harvest time. In the pot experiment, a combined application of the mix of three Agrobacterium spp. at 50%N proved to be the best treatment ensuring the highest values for all the measured parameters, which were statistically similar or higher than those recorded in uninoculated plants receiving 100%N. Field inoculation trials confirmed the results obtained in the pot experiment. In non-stressed environments, application of the bacterial mix at 50%N was as effective as the 100%N treatment. Meanwhile, under drought and salt stress conditions, the same treatment significantly increased grain yield by 33 to 42% and straw yield by 13 to 22% compared to uninoculated plants at 100%N. Furthermore, this treatment significantly enhanced N and P contents in wheat straw and grain in stressed environments. An economic analysis revealed that application of the selected mix with 50%N increased net-returns per hectare, ensuring a financial gain ranging from 26 to 106% compared to the control plants receiving a full N dose. The positive effect of the native Agrobacterium sp. mix on growth, yield, nutrition, and economic returns of durum wheat var. Razzek, when combined with 50%N, was proved for the first time. However, future studies should now focus on examining the behavior of this mix with other durum wheat varieties.
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    55 crop productivity
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    62 dry weight
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    76 field conditions
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    81 flag leaf area
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    164 schema:name A Mix of Agrobacterium Strains Reduces Nitrogen Fertilization While Enhancing Economic Returns in Field Trials with Durum Wheat in Contrasting Agroclimatic Regions
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