Abstract
Two host-specific toxins (HSTs), ACT-toxin Ib and Ic, were isolated from culture filtrates of Alternaria alternata affecting tangerines and mandarins. The biological characteristics of ACT-toxin Ib matched the criteria for HST. ACT-toxin Ib was detected by HPLC (high-performance liquid chromatography) analysis and was one of the major components in the ethyl acetate extracts of culture filtrates and spore-germinating fluids of the pathogen. ACT-toxin Ib induced veinal necrosis and a rapid increase in electrolyte loss from susceptible leaves oF Emperor mandarin, at 2×10 -8 M, and from susceptible Japanese pear cv. Nijisseiki (a potential host), at 1×10 -6 M, but did not affect resistant citrus and Japanese pear, at 2×10 -4 M [...]
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