Journal of Soil and Plant Interactions
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1- Department of Horticultural Science and Landscape Architecture, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
2- Department of Horticultural Science and Landscape Architecture, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran ,m.moghadam@um.ac.ir
3- Department of Horticultural Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran
2- Department of Horticultural Science and Landscape Architecture, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran ,
3- Department of Horticultural Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran
Abstract: (470 Views)
Background and Objective: Phosphorus plays a crucial role in the growth of medicinal plants. Phosphate-solubilizing bacteria (PSB) improve phosphorus uptake, while phenylalanine positively influences plant metabolic pathways. This study aimed to evaluate the effects of growth-promoting PSB and foliar application of phenylalanine on the growth characteristics, photosynthetic pigments, and essential oil content of meadow sage )Salvia virgata Jacq.) under greenhouse conditions.
Methods: The experiment was conducted in a factorial arrangement, based on a completely randomized design with two factors: nine bacterial species (Pantoea agglomerans, Bacillus pumilus, Bacillus licheniformis, Bacillus megaterium, Bacillus subtilis, Pseudomonas fluorescens, Pseudomonas putida, Enterobacter cloacae, Rhizobium meliloti) and a control, and three concentrations of foliar-applied phenylalanine (0, 100, and 200 mg L-1), with four replications.
Results: The interaction between bacteria and phenylalanine had a significant effect on all measured traits at the 1% probability level. The highest plant height and fresh and dry root weights were obtained with P. putida combined with foliar application of 200 mg L-1 phenylalanine. Application of B. licheniformis with 200 mg L-1 phenylalanine increased leaf relative water content (45.6%), chlorophyll a (50.0%), chlorophyll b (39.6%), total chlorophyll (35.9%), and carotenoids (39.4%) compared with the control (no bacteria or phenylalanine). The highest essential oil yield (0.57 %w/w) was observed in the P. fluorescens treatment combined with foliar application of 200 mg L-1 phenylalanine.
Conclusion: These findings indicate that application of B. licheniformis and P. fluorescens, together with foliar application of phenylalanine at 200 mg L-1, can effectively enhance essential oil yield and photosynthetic pigment content, thereby improving the yield and quality of meadow sage.
Methods: The experiment was conducted in a factorial arrangement, based on a completely randomized design with two factors: nine bacterial species (Pantoea agglomerans, Bacillus pumilus, Bacillus licheniformis, Bacillus megaterium, Bacillus subtilis, Pseudomonas fluorescens, Pseudomonas putida, Enterobacter cloacae, Rhizobium meliloti) and a control, and three concentrations of foliar-applied phenylalanine (0, 100, and 200 mg L-1), with four replications.
Results: The interaction between bacteria and phenylalanine had a significant effect on all measured traits at the 1% probability level. The highest plant height and fresh and dry root weights were obtained with P. putida combined with foliar application of 200 mg L-1 phenylalanine. Application of B. licheniformis with 200 mg L-1 phenylalanine increased leaf relative water content (45.6%), chlorophyll a (50.0%), chlorophyll b (39.6%), total chlorophyll (35.9%), and carotenoids (39.4%) compared with the control (no bacteria or phenylalanine). The highest essential oil yield (0.57 %w/w) was observed in the P. fluorescens treatment combined with foliar application of 200 mg L-1 phenylalanine.
Conclusion: These findings indicate that application of B. licheniformis and P. fluorescens, together with foliar application of phenylalanine at 200 mg L-1, can effectively enhance essential oil yield and photosynthetic pigment content, thereby improving the yield and quality of meadow sage.
Keywords: Bacillus licheniformis, Growth-promoting, Leaf relative water content, Phosphate, Pseudomonas fluorescens.
Type of Study: Research |
Subject:
Plant growth promoting microrganisms in the rhizosphere
Received: 2025/05/30 | Accepted: 2025/10/11 | Published: 2025/10/2
Received: 2025/05/30 | Accepted: 2025/10/11 | Published: 2025/10/2
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Journal of Soil and Plant Interactions by http://jspi.iut.ac.ir is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.
