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Plant resistance breeding has, so far, been based on specific resistance genes which regulate hypersensitive reaction, resulting in fast tissue destruction. Hungarian researchers have, however, discovered the existence of the general defense system ( gds ), which regulates a completely different plant defense reaction. This manifests itself in tissue thickening through cell enlargement. We have studied the biochemical background of these different plant defense processes by OPLC, a forced-flow version of planar chromatography. We also exploited some basic well-known advantages of planar chromatography which made its application suitable and favorable in our experiments. As a result of analysis of time-dependent changes in carbohydrate compounds, we confirmed pathological and symptomatological observations that plants have both general and specific defense systems. These two systems have different roles and strategies in excluding pathogens, but together constitute the complete disease resistance of plants.

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