INTERACTION OF TEMPERATURE AND LIGHT ON THE SEEDLING REACTION OF McMURACHY WHEAT TO RACE 15B OF STEM RUST

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Abstract
The reactions of seedlings of McMurachy wheat to stem rust (Puccinia graminis Pers. f. sp. tritici Erikss. & Henn.) race 15B were determined in growth chambers under various combinations of temperature and light. Experiments in continuous light on seedlings kept at temperatures alternating between 62° F. and 72° F. showed that the critical period determining reaction to rust was the time at which symptoms of infection (i.e. flecking) became visible. Experiments involving temperatures of 60°, 70°, and 75° F. at a photoperiod of 16 hr., with 8 hr. of darkness, showed that a 16-hr. period of low temperature (60° F.) and light induced resistance to the rust if this period fell between 51 and 115 hr. after inoculation but was most effective if it occurred between 75 and 91 hr.

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