CYTOGENETICS OF SOLID STEM IN COMMON WHEAT. IV. ANEUPLOID LINES OF THE VARIETY RESCUE

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Abstract
Tests of aneuploids for all 21 chromosomes showed that Rescue, a solid-stemmed, sawfly-resistant, commercial variety of common wheat, has fever chromosomes influencing solid stem than has its solid-stemmed parent, S-615. Its chromosomes 2D (XX) and 7D (XX3) do not tend to make the culm hollow, as in S-615; its chromosomes 3B (III) and 3D (XVI) do not tend to make the top internode solid, nor do 5B (V) and 5D (XVIII) tend to make the lower internodes solid. As in S-615, the chromosomes of group 6 tend to make the culm hollow, and chromosome 5A (IX) tends to make the culm solid, especially in the lower internodes, but to some extent in the top internode. The long arm of 5A affects the top internode and the short arm affects the lower internodes. Chromosome 3B tends to make the lower part of the top internode of Rescue hollow. These facts account for similarities and differences between Rescue and S-615 in pith distribution in the culm. However, differences between Rescue and S-615 F2 hybrids with hollow-stemmed varieties have not been resolved.