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Journal of Pathobiology and Physiology

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Morphological comparison of isolates of Phakopsora pachyrhizi from different locations of the Karnataka.


  In this study, morphological characteristics of uredespores of Phakopsora pachyrhizi Syd. the fungus causing rust disease in soybean has been studied with a view to determining the presence of morphological forms of the pathogen .Morphological characters such as shape, colour and size of uredospore (length and width) of P. pachyrhizi were studied. Characteristics of twenty three isolates of P. pachyrhizi showed considerable variability with respect to spore colour, spore shape and size (length and width). Six different coloured uredospores were observed viz., dark Brown, light pale yellow, pale yellow, pale brown to colourless, light to dark brown and orange brown.  Ellipsoidal, irregular and circular shape was observed in twenty three isolates of P. pachyrhizi with different size.  The length ranged from 92.93 to 63.41 µm and the width ranged from 73.05 to 45.01 µm. Ugarkhurd isolate was found to be different among 23 different isolates of P. pachyrhizi with respect to size, shape and colour.


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