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Impact of an arbuscular mycorrhizal fungus on Fusarium wilt in three tomato cultivars
Mohammad Rezvanjoo, Mehdi Sadravi, Alireza Khoshroo,
Volume 10, Issue 2 (9-2021)
Abstract
Rezvanjoo M, Sadravi M, Khoshroo A (2021) Impact of an arbuscular mycorrhizal fungus on Fusarium wilt in three tomato cultivars. Plant Pathology Science 10(2):74-81. Doi: 10.2982/PPS.10.2.74.
 
Introduction: Wilt caused by the soil-borne fungus Fusarium oxysporum f. sp. lycopersici is one of the most common and harmful diseases in most tomato growing areas. The disease damage is reported up to 27% of the yield in Iran. Biological control of the disease is an effective, environmentally friendly, and consumer health management method. The ability of arbuscular mycorrhizal fungi to reduce many soil-borne diseases has been demonstrated, so this study was conducted to investigate the effect of a commercially available arbuscular mycorrhizal fungus on disease severity in three tomato cultivars. Materials and Methods: The commercial inoculum of arbuscular mycorrhizal fungus Glomus geosprum was obtained from the market. The experiment was performed in a completely randomized statistical design with four replicates for each treatment. Inoculum of G. geosprum was added to sterile soil in pots and then seeds of Super-Strain, Chef, and Super-Falat tomato cultivars were sown. Seedling roots were inoculated at the three to the six-leaf stage with a spore suspension of a hypervirulent isolate of F. oxysporum f. sp. lycopersici. Data on the severity of the disease, stem height, root length were collected after the appearance of wilting symptoms and analyzed with the SPSS 20 software and the means values were compared. Results: The severity of the disease was significantly reduced in all cultivars treated with arbuscular mycorrhizal fungus, and the stem height and root length were higher than those with no mycorrhizal fungus. Conclusion: The ability of G. geosporum, to reduce the severity of Fusarium wilt disease and increase the growth of tomato plants is reported for the first time.
Correlation between arbuscular mycorrhiza in wheat and physicochemical characteristics of soil
Farzaneh Talaei, Mehdi Sadravi, Ebrahim Adhami,
Volume 11, Issue 2 (9-2022)
Abstract
Talaei F, Sadravi M, Adhami E (2022) Correlation between arbuscular mycorrhiza in wheat and physicochemical characteristics of soil. Plant Pathology Science 11(2):32-41.   Doi: 10.2982/PPS.11.2.32
 
Introduction: Arbuscular mycorrhizal fungi (AMF) in symbiosis with plant roots help to absorb more phosphorus, and increase the growth and development of plants. The aim of this study was to determine the correlation between population and diversity of AMF, and physicochemical characteristics of soil in wheat fields of Kohgiluyeh and Boyer-Ahmad province in southwestern Iran. Materials and Methods: Thirty wheat fields in this province, were visited near harvest time, and their rhizosphere and aerial organs were sampled. AMF spores were isolated by sieving the rhizosphere suspension in water and centrifuging in Sucrose solution. The spore population of these fungi was count. The percentage of root length colonization by these fungi was calculated in every sample. The morphological characteristics of the isolated spores were studied and the collected information was compared with the descriptions of AMF and the fungi present in each sample were identified. Texture, soil dispersion, soil and plant phosphorus content were determined and the correlation coefficient between AMF population and diversity with physical and chemical characteristics of soil and wheat plant were calculated. Results: Fifteen arbuscular mycorrhizal fungi belonging to nine genera: Acaulospora, Archaeospora, Entrophospora, Gigaspora, Claroideumglomus, Funeliformis, Rhizoglomus, Septoglomus and Scutellospora were identified. The diversity of these fungi in the samples was (2-)2.9(-5) and F. mosseae was dominant species with 90% relative frequency. The population of these fungi had a negative correlation with soil pH, but with soil soluble phosphorus and plant phosphorus content had a positive correlation. The diversity of these fungi had a positive correlation with soil soluble phosphorus. There was a positive correlation between the amount of sand in the soil and the root length colonization. Conclusion: AMF have a greater population and diversity in soils with light texture, less moisture along with low amounts of soluble phosphorus and organic matter. The positive correlation between the population of these fungi and plant phosphorus indicates their usefulness for the plant.

 
The impact of three arbuscular mycorrhizal fungi on wheat take-all disease caused by Gaeumannomyces graminis var. tritici
Safar Nikmaram, Mehdi Sadravi, Mostafa Ghaderi Zefrehee,
Volume 13, Issue 1 (2-2024)
Abstract
Nikmaram, S., Sadravi, M., & Ghaderi Zefrehee, M. (2024). The impact of three arbuscular mycorrhizal fungi on wheat take-all disease caused by Gaeumannomyces graminis var. tritici. Plant Pathology Science, 13(1), 104-112.
 
Take-all caused by soil-borne fungus Gaeumannomyces graminis var. tritici is one of the most important diseases of wheat in the world, reported to cause up to 50% yield losses. The disease has also been reported from different areas of wheat cultivation in Iran. Biological control is a healthy and environment-friendly method for managing plant diseases, and arbuscular mycorrhizal fungi can play an important role in this field. This research was conducted to determine the effect of three arbuscular mycorrhizal fungi on the severity of this disease. The pathogen was isolated from diseased wheat plants in Kigiluyeh and Boyar-Ahmad Province, southwestern Iran. The effect of three arbuscular mycorrhizal fungi; Funneliformis mosseae, Rhizoglomus intraradices, and Blaszkowskia deserticola alone, and in combination on the disease severity and growth indices of wheat was tested under greenhouse conditions in a completely randomized design. All treatments of mycorrhizal fungi reduced disease severity and increased growth indices compared to control plants, but F. mosseae was more effective than others. Therefor
F. mosseae can be used to reduce the severity of the disease and improve the growth indices of wheat.

 
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