Cytogenetics and Self -fertility of Hybrids Between Triticum aestivum L. and Agropyron cristatum(L.)Gaertn

Abstract

To further investigate genomic relationships between Agropyron and Triticum,and to evaluate genetic effects of the P genome on self-fertility in intergeneric hybrids, the hybrids of T. aestivum cv. Fukuho(2n=6x=42; AABBDD)with threeaccessions of tetraploid A. cristatum(L.)Gaertn.(2n=4x=28; PPPP)were obtained. Results indicated that:(1) Genetic basis differred markedly among hybrids from the various combinations, so did relatively among hybrids in the same combination;(2)A.cristatum Z559 used in this experiment could not contain a genetic system to switch off Ph suppressor of wheat, but homoeology may exist between theP genome and the wheat genomes;(3) The hybrids growing normally of Fukuho ×A. cristatum Z559 were partially self-fertile, with a character of crossing reproduction. The fertility was possibly determined by a special genetic factor controllingchromosome segregation at meiotic anaphase in the P genome;(4)The type of polyploid in Agropyron was not strictly autoploid. It was further verified that fertility of the intergeneric hybrids could be increased greatly through plants regeneratedfrom immature in florescence cultures.Received June 24,1993. Mr. Yang Xinming also takes part in this research work