--Peter A. Peterson
This deficiency arose as a full colored shrunken kernel from the cross C-I Sh Bz Wx x C sh bz wx. In confirmatory crosses full-colored-shrunken and bronze-shrunken ear progeny appeared. In the reciprocal crosses, where the plant from the colored shrunken seed was used as a male on a C sh bz wx plant that was used as the female, only bronze-shrunken seed appeared among the progeny. This change to a double mutant from C-I Sh to C sh and its nontransmissibility as a male indicates a deficiency of this segment of the chromosome.
The transmission is also affected from the female side of the cross.
In the cross Df Bz Wx/C sh bz wx x C sh bz wx, the
|Bz sh||bz sh||T||Bz|
This shows an impaired transmission of this chromosome even as a female.
Though the tests are not extensive, all the sh Bz plants
show this behavior. An extensive testing of sh Bz plants
would uncover a possible crossover. Thus far, none has been found; all
the sh Bz plants show this behavior.
to the MNL 63 On-Line Index
Return to the Maize Newsletter Index
Return to the Maize Genome Database Page