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Characteristics of resistance to exserohilum turcicum helminthosporium in sorghum bicolor

Characteristics of resistance to exserohilum turcicum helminthosporium in sorghum bicolor

Plant Disease Reporter 61(8): 657-661

A cell-free culture filtrate of E. turcicum reduced transpiration in 3 sorghum cultivars that were susceptible to leaf blight; a resistant cultivar was not affected. Differential reactions for these 4 cultivars were determined in field and greenhouse trials. The resistant cultivar was differentiated further from susceptible sorghums by a comparatively greater frequency of a hypersensitive response as the plants matured. The most susceptible cultivar exhibited a diminished capacity to respond to infecting conidia with necrotic flecking. The response in 2 moderately susceptible cultivars was greater in frequency and duration than in the susceptible, but less frequent and of shorter duration than in the resistant. The hypersensitive reaction developed with greatest frequency in 4 host differentials at the 3-leaf stage of growth; this growth stage was also the most susceptible to infection.

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