CYTOGENETICS OF THE F₂ PROGENY OF A HIGHLY STERILE HYBRID AVENA LONGIGLUMIS×A. STRIGOSA

抄録

High sterility of the hybrid Avena longiglumis×A. strigosa is caused by irregular and multiple associations of meiotic chromosomes. By free pollination, however, it gave 22 F₂ seedlings with 14, 15 and 16 somatic chromosomes. Of them 15 plants (2n=14 and 15) survived to maturity. Based on the results of cytological and morphological observations a few plants seemed to recover almost similar chromosome component to that of the parents. The others clearly exhibited mixed traits of both parents as ever. Seed fertility of the F₂ plants appears to be much dependent on the number of ring bivalents.