10. Short‑plant types.

Fourteen unrelated short‑plant stocks were grown in the nursery in 1949, along with a number of additional derived and recovered lines. A number of these stocks were crossed with multiple linkage‑testers. An active search for new short‑plant mutations is continuing.

The "Oakes dwarf" gene, provisionally located in the short arm of chromosome 3 (Maize News Letters No. 15 and No. 16) was found not to be the same as Singleton's rd. Crosses between rd and the "Hy dwarf" gave normal F₁'s, also indicating that the "Hy dwarf" gene is not rd. In this connection, it should be noted that this "Hy dwarf", which was obtained by a number of corn workers from a comnon source, is not a mutation arising directly from inbred Hy, but was found in one of the more extreme Hy variants.

Earl R. Leng