Vol. 10, Issue 10 (2021)

Author(s):
SN Singh

Abstract:
Pathogenic microorganisms release toxic substances which are related to post superficially toxin seems to play an important role in host recognition at the site of initial contact of germinating spores on host surface thus, enabling the pathogen in establishing symptoms. In this study TLC purified toxin, crude toxin and spore suspension were taken of all five virulent strain of Helminthosporium sativum on susceptible variety UP 2329 and see how they produce symptoms in laboratory. The lowest Rf value of all the isolates of H. sativum were found more toxic and helpful in symptom production along with its characterization. Toxin play important role to screen out a number of varieties within a short time which are susceptible or resistant against disease.