Cytogenetical Studies in <i>Avena</i>

Abstract

This paper deals with an analysis of chromosome pairing, especially associations between the A and B' genoms, in hybrids between Avena barbata (AAB'B') and autotetraploids (AAAA). In addition to 7 bivalents (from pairing between A and A), usually 5 bivalents and often 6 were formed between B' and the remaining A genom. In the extreme case all chromosomes entered into pairing relationship but more than 13 bivalents, inclusive of some multivalent associations, were not found. The mode of chromosome pairing is discussed.The writer wishes to express here his best thanks to Professor KIHARA and Dr. F. LILIENFELD for their valuable criticism and help in this work.