Segregation of a <i>Cryptomeria</i> needle anomaly, an outward-hooked needle, in selfed and crossed progenies

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  • スギ外向鈎形針葉の次代交配家系における分離
  • スギ ガイコウ コウケイ シンヨウ ノ ジダイ コウハイ カケイ ニ オケル

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Abstract

The variant needle-form described as an outward-hooked needle is a shorter needle with a sharply outward-hooking at its tip. The segregation of normal and variant seedlings was examined in selfed families of one clone with variant needles (Cr-54), in reciprocally crossed families between Cr-54 and clones with normal needles, and in selfed and crossed families of normal clones. The segregation ratio was about 9 (variant):7 (normal) in selfed families of Cr-54. Variant seedlings were segregated in all of the reciprocally crossed families between normal and variant parents, and the ratio was 1 (variant):3 (normal). No variants occurred in selfed and crossed families of normal parents. If the variant needle-form is inherited by one dominant gene, the segregation ratios observed in selfed families of Cr-54 and in reciprocally crossed families between normal and variant parents are different from the expected ratios, such as 3:1 in selfed families of heterozygotes and 1:1 in reciprocally crossed families. The segregation ratios observed can be explained by considering the existence of two dominant alleles behaving as complementary genes and supposing Cr-54 to be a doubleheterozygote.

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