Morphotypes of broomrape parasitizing on sunflower in the Rostov region

The broomrape (Orobanche cumanaWallr.) morphotypes not described earlier and found out in its most vi-rulent populations in the Rostov region are presented. The ability of this broomrape species is shown at parasitizing on sunflower to form plural adventitious shoots from tuber tissues, apical and basal parts of rudimentary roots and in axils of stem scales are shown. The structures similar to somatic embryos are found out on a surface of tuber basal part. The role of the specified changes in increase of reproductive function potential of O. cumana is discussed.