| Aneuploids found in synthesized wheats, ABD Nos. 4
and 5 J. TABUSHI Kasei College, Kyoto, Japan The writer found several aneuploids in synthesized 6x-wheats, ABD No. 4 and 5. Aneuploids with 2n=41 showed mostly the pairings 20II+1I, 19II+3I and 18II+5I at MI in PMC. Five individuals of ABD No. 4 with 2n=41 were backcrossed to T. persicm stramineum and T. persicum fuliginosum, respectively. The somatic chromosome numbers in the BF1 hybrids from the above crossings were 35, 34 and 33. Among them plants with 2n=35 showed mostly 14II+7I and rarely 13II+9I at MI, while plants with 2n=34 revealed 13II+18I and 12II+10I, and plants with 2n=33, 13II+7I and 12II+9I. Consequently, it has been assumed that those 2n=41 Plants have lost one chromosome from A or B genome. |