The six lines not previously tested (MNL 56) do not carry a cytoplasmic restorer of genetic male-sterile #1. This completes the test of 40 of those lines. One line (PI 174990 x B1416 x A63214) has not been tested. I have been unable to establish the stock.
If a cytoplasmic restorer is specific for a particular male-sterile gene, it will be necessary to test the other male-sterile genes.
Chas. R. Burnham
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