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- W1977202210 abstract "Leaf mesophyll protoplasts of susceptible and resistant corn (Zea mays L.) and non-host oats (Avena sativa L.) were treated with HC toxin. This toxin, a cyclic tetrapeptide produced by the fungus Helminthosporium carbonum race 1, is a pathogenicity factor for the disease Helminthosporium leaf spot. The effects of HC toxin on susceptible protoplasts differed from those in other toxin/protoplast systems in which toxin rapidly decreases viability. In contrast, HC toxin promoted long-term viability (i.e staining with fluorescein diacetate) of protoplasts cultured in a minimal medium. The first effect of HC toxin, observed after 36 h or more depending on the culture medium used, involved changes in the distribution of chloroplasts within the protoplasts. Increases in budding of protoplasts occurred after 48 h of exposure to toxin. Effects of HC toxin on chloroplast distribution and protoplast shape might be due to enhanced nutrient uptake. As in other types of studies with HC toxin, protoplasts from a susceptible genotype were affected by low toxin concentrations (1 μg/ml), whereas protoplasts from resistant genotypes (host and non-host) showed similar effects at higher toxin concentrations (10 μg/ml). Chlamydocin, a cyclic tetrapeptide similar to HC toxin produced by the fungus Diheterospora chlamydosporia, also altered chloroplast distribution in corn protoplasts, with no differential effect on susceptible and resistant protoplasts. Effects on chloroplast distribution in susceptible corn protoplasts might be used as a bioassay for activity of small volumes of HC toxin preparations." @default.
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- W1977202210 date "1991-01-01" @default.
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- W1977202210 title "Effects of Helminthosporium carbonum race 1 toxin on host and non-host cereal protoplasts" @default.
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