Ellison (1940) reported the meiotic behavior of the 
triploid F, of A. longiglumis XA. abyssinica. The most 
frequent configuration found in 45% of the cells exam- 
ined consisted of 5 univalents, 5 bivalents and 2 triva- 
lents. Quadrivalents were rare, but each cell showed at 
least 1 trivalent or 1 quadrivalent. One cell had 4 uni- 
valents, 5 bivalents, 1 trivalent and 1 quadrivalent. As 
the meiotic behavior of this hybrid is very similar to that 
of A. barbataX A. strigosa and because the pairing inthe 
F, of A. barbataX A. abyssinica, as discussed above, is 
very close, it seems certain that the genome constitution 
of A. abyssinica is AAB’/B’. However, it is not clear 
whether A. longiglumis is AA or B‘B’. 
Hewaploid X Diploid—T he meiotic behavior of the tet- 
raploid F; of A. sativaX A. strigosa was reported by 
Kihara and Nishiyama (19382). The number of bivalents 
expected would be 7, while the number found ranged 
from 8 to 9 with the mode being 7. Multivalents found 
in the majority of cells had from 8 to 7 members. The 
same workers reported that in the tetraploid F) of A. 
fatuaX A. strigosa the situation was similar, but with 
the pairing perhaps a little weaker. ‘The number of bi- 
valents ranged from 2 to 9 with the mode being 6. 
Among the multivalents one eight-membered structure 
was found. he multivalents were believed to be formed 
by the supernumerary chromosomes of A. sativa and A. 
fatua pairing among themselves. As it is impossible to 
tell how many bivalents are formed in this way, it cannot 
be considered as demonstrated that A. strigosa, A. sat- 
iva and A. fatua have a common genome. 
On the other hand, Ellison (1940) reported that in the 
tetraploid F, of A. longiglimis XA. sativa there were 
usually at least 7 bivalents in each cell. Trivalent and 
quadrivalent formation were found to be less common 
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