The c-m55437 allele at the C locus has been isolated originally by Peterson (1963). This mutable allele is under the control of the En transposable element system. Test crosses of c-m55437 (c-m Sh Wx/c sh wx X c sh wx1c sh wx) gave rise to an excess of colourless round kernels among the progeny (Table 1). This could be due to the segregation of three or more En elements or the allele is autonomously mutating giving rise to a high frequency of colourless derivatives. In order to differentiate between these two alternatives, plants grown from colourless round sib kernels were crossed to the En tester, c-m(r)/c-m(r), and an En line c sh wx/c sh wx; En. No spotted kernels were found among the progeny of either cross. These results confirm that the c-m55437 allele is autonomously controlled by the En element.
Table 1: Test cross of spotted type. The cross was c-m Sh Wx/c sh
wx x c sh wx/c sh wx (shrunken progeny not given).
|87K 0331-1 x 0343||53||2||0|
Ch. Jayaram, P.A. Peterson and A.R. Reddy
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