[Effects of elevated atmospheric ethylene on the development of regenerative organs of short-stem wheat cultivars].

Laboratory experiments were performed to study cytoembryologic development of regenerative organs of wheat cult. 20-1-Shortstem and cult. Apogee in atmosphere with elevated concentration of ethylene.

[Embryological investigation of super-dwarf wheat grown in laboratory experiment with elevated content of ethylene in atmosphere].

Data of the cytoembryological analysis of plants of super-dwarf wheat grown in laboratory experiment with elevated ethylene content in atmosphere were compared with results of space experiment and the ground control with ambient ethylene concentration. It was shown that crop barrenness in both the space and ground experiments was caused by exposure to increased ethylene throughout the whole ontogenesis which made pollen nonviable. The cytogenetic analysis revealed that male sterility of the wheat flowerlets in space flight evolved, as a rule, earlier and was deeper by character, i.

[Cyto-embryologic investigation of super dwarf wheat grown on board of the Mir orbital complex].

The cytoembryologic analysis of wet and dry samples of super dwarf wheat cultivated in greenhouse SVET aboard the MIR station over the whole cycle of vegetation was made with the use of light microscopy. Characteristic features of wheat development in space flight are plentiful early tillering, and formation and rapid growth of side shoots. Elementary spikelets in the composite head were more numerous but the top spikelets were rudimentary and, therefore, the ripe head contained less of these spikelets as compared with the ground controls (9-13 and 14, respectively).

[Cytoembryologic studies of super dwarf wheat grown in "Svet" greenhouse in the ground-based experiments].

The Project of scientific programs MIR/SHUTTLE and MIR/NASA was allowed for studying the productional, cytoembryological, morphological, biomechanical and other characteristics of superclub wheat on cultivation in the Svet greenhouse on-board orbital complex. This work was aimed at studying the duration of the complete cycle of ontogenesis of wheat and its individual stages, the peculiarities of forming the reproductive organs, processes, fertilization and formation of the seed production while cultivating in the Svet greenhouse under terrestrial conditions. Superclub wheat has been the object of experimentation.