Homeology Between the Chromosomes ofAvena macrostachyaand theAvenaC Genome

摘要

AbstractTo gain more information about the widely unknown genome constitution of the taxonomically and agronomically interesting wild oatAvena macrostachya, this tetraploid species was crossed (as the pollinator) with several diploidAvenaspecies. Hybridization failed withA. strigosa(AsAs),A. hirtula(AsAs), andA. longiglumis(A1A1), but succeeded withA. atlantica(AsAs),A. prostrata(ApAp), andA. pilosa(CpCp). The output of hybrids and the vitality of the F: plants were highest in the combinationA. pilosa×A. macrostachya.Hybrids from this cross relatively frequently showed trivalents at metaphase I as compared to the nearly consistent formation of seven univalents and seven bivalents in hybrids with the A genome speciesA. atlanticaandA. prostrata. Altogether, the results confirm an auto‐ploid origin ofA. macrostachyaand demonstrate that among the two known basic genomes A and C of the genusAvenaonly the latter exhibits considerable homeology to theA. macrostachyageno