Modelling the relationships between temperature and mycelial growth and microsclerotial germination rate of Macrophomina phaseolina

Document Type : Research Article

Authors

1 Plant Protection Research Department, Golestan Agricultural and Natural Resources Research Center, AREEO, Gorgan, Iran

2 Graduate M.S. student, Department of Plant Pathology, Islamic Azad University, Damghan Branch, Damghan, Iran

3 Department of Plant Protection, College of Agriculture, University of Zanjan

Abstract

Macrophomina phaseolina is a soil born fungal pathogen causing charcoal rot of soybean and several other plants. Disease intensity in different hosts is related to hot and dry weather condition. In order to determination of cardinal (minimum, optimum and maximum) temperatures required for mycelial growth and microsclerotial germination, three fungal isolates from soybean fields of three regions Aliabad, Gorgan and Kalaleh in Golestan province were studied in vitro. Mycelial growth and germinated microsclerotia number were recorded daily in different temperatures and data were fitted with three growth models (Beta, segmented and dent-like). Results of statistical analyses (nonlinear regression) showed that the segmented and Beta were the most suitable model for describing the relationships between mycelial growth and microsclerotial germination of this fungus, respectively. Minimum, optimum and maximum temperatures estimated for mycelial growth were 8, 34.5 and 44.3 ºC, respectively, and 8.9, 32.3 and 45.5 ºC for microsclerotial germination.

Keywords

References

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Modelling the relationships between temperature and mycelial growth and microsclerotial germination rate of Macrophomina phaseolina
 
Iranian Journal of Plant Pathology
Volume 57, Issue 4
December 2022
Pages 269-280

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