1. Hexaploid wheats evolved in farmers' fields.

2. The number of chloroplast and chlorophyll content in the dodecaploid are more than hexaploid, stomatal density are lower than hexaploid.

3. The sterile triticale plant was a tall hexaploid cross called X 308 .

4. In contrast to the constancy in nuclear DNA amount at the intraspecific level, there are significant differences in genome size between the various allopolyploid species, at both the tetraploid and hexaploid levels.

5. In some instances we were able to find a clear influence of distinct species or genomes on the characters of their alloploid taxa, e. g. an influence ofAegilops tauschii on the characters of the hexaploid wheat species and on the remaining species of sectionVertebrata ofAegilops.