| Abstract |
Wheat stem rust (Puccinia graminis (Pers.) f. sp. tritici Eriks and Henn.), an obligate parasitic fungus, causes a serious rust disease of wheat in all wheat growing areas of the world. A study on the behavior of rust spores on host leaf surface would provide useful information on genetics and biochemistry of primary infection, which could be correlated with the earlier biochemical changes related to susceptibility or resistance. There are a series of distinct steps or stages from the moment a parasite unit is placed on a host until a compatible and functional or incompatible relationship is established. The interaction may be eventually reach a climax in an infection type or an indeterminant status of the diseased condition. Therefore infection type is an indication of whether particular genetic units are involved in the interaction. |
