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Effects of uniconazole and biofertilizers on some growth indices and contribution of dry matter remobilization in grain yield of wheat
(Triticum aestivum L.) under soil salinity
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Fatemeh Aghaei   , Raouf Seyed Sharifi * , Hamed Narimani |
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Abstract: (1163 Views) |
Introduction: In arid and semi-arid regions, drought stress as the main factor and salinity stress as a secondary factor reduces plant growth and yield. One approach to improve the salt stress problem is the use of plant growth promoting rhizobacteria (PGPR) and Mycorrhiza. The PGPR are a group of rhizosphere colonizing bacteria that produces substances to increase the growth of plants, synthesize different phytohormones, including auxins, cytokinins, and gibberellins, synthesize enzymes that can modulate plant growth and development. Arbuscular mycorrhizal fungi (AMF) symbiosis is considered a valuable component in most agricultural systems due to their role in plant nutrition and soil health. Foliar application of uniconazole can improve tiller number, root growth and leaf area per plant. Also it enhances plant photosynthetic and total sugar concentrations. So, the use of biofertilizers and uniconazole can be recommended as appropriate management factors for increasing grain yield of wheat under soil salinity conditions.
Materials and methods: In order to study the effect of uniconazole and biofertilizers on yield, dry matter remobilization and some growth indices of wheat (Triticum aestivum L.) under soil salinity condition, a factorial experiment was conducted based on randomized complete block design with three replications in a research greenhouse of Faculty of Agriculture and Natural Resources University of Mohaghegh Ardebili in 2018. Treatments were included: A) soil salinity in four levels (no application of salinity as control, application of 40, 80 and 120 mM by NaCl) and B) application of uniconazole and bio fertilizers in seven levels (application of uniconazole, mycorrhiza, Pseudomonas, mycorrhiza with Pseudomonas, mycorrhiza with uniconazole, both application mycorrhiza with uniconazole and Pseudomonas, control or without application of bio fertilizers and uniconazole).
Results: The results showed that uniconazole and biofertilizers application under without salinity, increased leaf area index (50.98%), crop growth rate (17.44%), net assimilation rate (53.10%), total dry matted (27.68%) and grain yield (108.84%) in comparison with no application of uniconazole and biofertilizers at the highest level of soil salinity. While, application of uniconazole and biofertilizers under without salinity decreased dry matter remobilization (0.207 g.per plant) and the contribution of dry matter remobilization to grain yield (12.92%) and increased the contribution current photosynthesis in grain yield (87.07%) in comparison with no application of uniconazole and biofertilizers under the highest level of soil salinity.
Conclusion: According to the results obtained, application of uniconazole and biofertilizers can increase grain yield of wheat under soil salinity condition due to improving growth indices and current photosynthesis. |
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| Keywords: Crop growth rate, Current photosynthesis, Leaf area index, Mycorrhiza |
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Full-Text [PDF 1083 kb]
(181 Downloads)
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Type of Study: Research |
Subject:
Ecophysiology
Received: 2024/03/16 | Accepted: 2023/09/21 | Published: 2023/09/21
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