Journal of Soil and Plant Interactions
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Ferdowsi university of Mashhad
Abstract: (36 Views)
Background and Aims: 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 growth characteristics, photosynthetic pigments, and essential oil content of Salvia virgata under greenhouse conditions.
Methods: The experiment was conducted in a factorial, 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), 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 weight were obtained with P. putida combined with foliar application of 200 mg/L phenylalanine. Application of B. licheniformis with 200 mg/L 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 (1.18 cc per pot) was observed in the P. fluorescens treatment combined with foliar application of 200 mg/L phenylalanine.
Conclusion: These findings indicate that application of B. licheniformis and P. fluorescens, together with foliar application of phenylalanine at 200 mg/L, can effectively enhance essential oil yield and photosynthetic pigment content, thereby improving the yield and quality of Salvia virgata.
Methods: The experiment was conducted in a factorial, 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), 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 weight were obtained with P. putida combined with foliar application of 200 mg/L phenylalanine. Application of B. licheniformis with 200 mg/L 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 (1.18 cc per pot) was observed in the P. fluorescens treatment combined with foliar application of 200 mg/L phenylalanine.
Conclusion: These findings indicate that application of B. licheniformis and P. fluorescens, together with foliar application of phenylalanine at 200 mg/L, can effectively enhance essential oil yield and photosynthetic pigment content, thereby improving the yield and quality of Salvia virgata.
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
Received: 2025/05/30 | Accepted: 2025/10/11
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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.
