Abstract
Landraces of maize ( Zea mays ssp. mays) and its wild teosinte relatives ( Zea mays spp. parviglumis and mexicana) were surveyed for sensitivity to fumonisin B 1, a phytotoxin produced by the maize pathogen Gibberella moniliformis. Only two of 42 Z. mays samples were highly insensitive to FB 1 (ED 50 = ca. 200 μM). The teosintes and 76% of the maize landraces were moderately or highly sensitive to FB 1 (ED 50 ⩽ 30 μM), which indicates that FB 1 sensitivity is likely to be an ancestral trait in Z. mays. F 1 generations derived from crosses between FB 1-sensitive maize inbred B73 and insensitive landraces were significantly less sensitive than B73. Thus, our data indicate that FB 1-insensitivity is a relatively rare but heritable trait in maize. We also report the sensitivity of maize to other Gibberella toxins – beauvericin, diacetoxyscirpenol, and moniliformin.
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