A Comparative Study of Wheat Leaf Infection by Bipolaris Sorokiniana on Resistant and Susceptible Wheat Varieties using Scanning Electron Microscopy
2021
Bipolaris sorokiniana is a phytopathogenic fungus that causes diseases in
cerealcrops worldwide. In this study, the speed of infection by the fungus on
wheat leafsurface tissues was observed using scanning electron microscopy. The
fungus was isolated from diseased wheat plants and identified to be B. sorokiniana
based onmorphological characteristics. Young leaves of wheat plants
were point inoculatedwith a conidial suspension of B. sorokiniana, and infection
process of the pathogenwas observed. The fungus germinated on wheat leaf
surface within eight hrs ofinoculation and its germ tube was elongated in 12
hrs of inoculation. On theleaf surface, a hyphal mat was initiated within 24 hrs
after inoculation with thinmycelial mat produced by 48 hrs. Moreover, germ
tubes elongated more on thesurface of the resistant varieties. The infection rate
and pathogenesis depended onhost resistance to the disease. This study provides
scanning microscopic evidenceshowing that the fungal pathogen can grow
speedily on wheat leaf surface within a short period of time, indicating its virulence
on susceptible wheat varieties.
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