Heterogeneous Reaction of Shattercane to Periconia circinata and its Host-Specific Toxin

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Abstract
A collection of shattercane (Sorghum bicolor) from southeastern Nebraska [USA] contained a portion (35-40%) of seeds that was susceptible to the causal agent of milo disease, P. circinata, and to its host-specific toxin. The shattercane was not affected by inoculation with an isolate of the fungus non-pathogenic to grain sorghum nor by culture filtrates of the non-pathogenic isolate processed by the same methods used to prepare toxin from the pathogen. The level of susceptibility to the toxin was quantitatively intermediate between that of homozygous susceptible and heterozygous (F1) grain sorghum genotypes. The remaining seeds (60-65%) as well as those of 2 other shattercane collections were resistant. Implications of these findings relative to the single-gene source of resistance to P. circinata are discussed.

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