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In the tubercle of  O. cumana  of high-virulent populations from Rostov region of Russian Federation some changes were found, which helped to improve the seed productivity and to decrease the development period of fruiting shoots. The maintenance of high level of seed productivity can be realized by setting multiple meristematic zones in a tubercle and simultaneous development of several adventive shoots from them. The maintenance of viability of tubercle and the formation of new shoot apexes after the seed ripening on one or several stems, grown out of it and finished in the vegetation period, also go in the favour of the improvement of seed productivity. The development of the apexes of tubercle rudimentary roots into adventive shoots was observed in this paper.

SOME PECULIARITIES OF ONTOGENESIS OF Orobanche cumana Wallr., PARASITIZING ON SUNFLOWER IN ROSTOV REGION OF RUSSIAN FEDERATION