其他摘要：In this study, to select trees with various male-sterile genes from breeding materials in Niigata Prefecture, we observed male strobili or pollen dispersal for 6,240 seedlings obtained from 179 pairs of artificial-crossing between male-sterile trees (Shindai3 (ms1/ms1), Toyama1 (ms1/ms1), Shindai1 (ms2/ms2), Shindai5 (ms3/ms3), and Shindai8 (ms4/ms4))and 137 clones of breeding materials in Niigata Prefecture. The results showed that “Gosenshi-1” was heterozygous for the ms2 allele, “Kamikiri Niigata-15”, “Sado-102” and “Sado-119” were heterozygous for the ms3 allele, and “Kamikiri Niigata-58” was heterozygous for the ms4 allele. In addition, Shindai3 and “Higashikanbara-7” might have an unknown heterozygous male-sterility gene which is different from MS1, MS2, MS3 and MS4, since the segregation rates of male-fertile and male-sterile trees in two families (the self-fertilization of “Higashikanbara-7” and the artificial-crossing between Shindai3 and “Higashikanbara-7”) were followed to 3:1. Trees with ms2 to ms4 selected in this study were valuable. It is expected that these trees will contribute to future study and breeding.
