cytoembryology

In a course of investigation of seed productivity under the pollenless regime of flowering in 154 natural populations of 98 species of 46 the Asteraceae genera from Saratov province gametophytic apomixis has been discovered in populations of 24 species from 14 genera. For the first time this mode of reproduction has bean revealed in 7 genera and 16 species of the family (Hieracium largum, Pilosella echioides, Tragopogon dubius, Lactuca serriola, Scorzonera ensifolia, Chondrilla latifolia. Ch.

The monitoring of the frequency of apomixis was making in popu- lations of 7 species of Chondrilla in the south of european part of Russia. It is shown that the plants of 6 examined species (C. juncea, C. graminea, C. canescens, C. brevirostris, C. latifolia и C. acantho- lepis) are characterized by their ability to seed reproduction by apo- mixis. This fact is confirmed by results of a study of seed productivity of the species of the genus Chondrilla at the regime of blossoming without pollen and cytoembryological analysis megagametophytes of the same plants.