Influence of Helminthosporium maydis, Race T, Toxin on Potassium Uptake in Maize Roots 12

AUTOR(ES)

Frick, Hugh

RESUMO

The effect of a toxin extract of Helminthosporium maydis, race T on K+ (86Rb) uptake by excised root segments of normal (N) and Texas cytoplasmic male-sterile (T) versions of corn inbred W64A was investigated. The uptake of K+ was inhibited in both N and T roots by the toxin. This was true for both basal (freshly excised) and augmented (pretreated with aeration) K+ uptake. Augmented uptake was more toxin-sensitive than basal uptake (irrespective of cytoplasm type), and the augmented uptake in T roots was seven to eight times more toxin-sensitive than in N roots.

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