Abstract: Soluble proteins extracted from various organs of cucumber (Cucurnis sativus L. ) were analyzed using the technique of SDS one dimensional gel electrophoresis. The majority of the proteins were expressed in more than one organ, while those specific to only one organ were comparatively rare. Only two of all the proteins analized appeared to be truely organspecific. A 40.0 kD protein and a 30.8 kD protein were observed only in extracts of reproductive organs stamen and ovary. Some proteins were specific only to certain reproductive organ. They are 35.0 kD and 34.0 kD in sepal, 18. 8 kD, 28.5 kD, 31.0 kD, 37.0 kD and 39.0 kD in stamen, 45.0 kD in style with stigma and 32.5 kD in ovary. IEF-SDS two-dimensional'electrophoresis showed that many of the one-dimensional gel bands represented several proteins dots in the 2-D and that some of them were unique to an organ-type of the flower. Protein analysis of the various organs showed that stamens contained the greatest amount and petals the least amount of protein.

Key words: Cucumber, SDS one-dimensional electrophoresis, IEF-SDS two-dimensional electrophoresis, Organ-specific protein