Studres on the production of amphidiploids as the sources of resistance to leaf-rust in wheats. III. Cytogenetical studies on the Fl hybrids and the amphidiploids, Triticum Timopheevi ZHUK. x Aegilops longissima ScHW. et MUSCH.

Abstract

In this experiment the writers tried to synthesize 6x-anlphidiploids by the artificial hybridization between T. Timopheevi ZHUK. and Aegilops lolegissima SCHW. et MUSCH., with an aim ta combine the leaf-rust resistant genes that were possessed separately by these two species into a single one, and to make this new wheat to be a good source of resistarce to leaf-rust in wheats. By applying 0.05 % colchicine solution to the F₁ seeds 247 mature arrlphidiploids were obtained successfully. In the root-tip cells of F₁ plants, 21 somatic chromosomes were confirmed, which correspond to the sum of reduced numbers of their parents, and in those of amphidiploids 42 chromosomes were clearly counted corresponding to the multiple number of chromosomes of F₁ plants.