Possibilities of interspecific hybridization between <i>Chamaecyparis lawsoniana</i> and some other <i>Chamaecyparis</i> species

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  • ローソンヒノキと他のヒノキ属数種との種間交雑の可能性
  • ローソンヒノキ ト タ ノ ヒノキゾク スウシュ ト ノ シュカン コウザツ

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Interspecific crosses between Chamaecyparis lawsoniana (A. MURR.) PARL. as the female parent and C. pisifera (SIEB. et ZUCC.) ENDL., C. obtusa (SIEB. et ZUCC.) ENDL. and C. thyoides (L.) B. S. P. as male parents were artificially made, along with intraspecific crosses of the maternal species, in 1975 and 1976. On the basis of the differences in cone, seed, and seedling yields among the interspecific and the intraspecific crosses, the possibilities of the interspecific hybridization between the species described above are discussed. There was no significant difference in cone yields, number of total seeds per cone, and the germinative capacities among interspecific and intraspecific crosses. The full seed yield expressed as percent of total seeds was relatively high in C. lawsoniana×C. pisifera, but in C. lawsoniana×C. thyoides nearly perfect cross-sterility was observed. There were considerable differences in cone yields, number of total seeds per cone, and full seed yields between the two years, and also between the female parent trees in the number of total seeds per cone and full seed yields. Survival of one-year-old seedlings was relatively high in C. lawsoniana×C. obtusa because of a greater resistance to damping-off, but it was very low in C. lawsoniana×C. pisifera because most of the hybrid seedlings were xantha (lethal). As a result, it is considered that the cross between C. lawsoniana and C. obtusa has the best possibility for producing acceptable hybrids in the interspecific hybridization among Chamaecyparis species.

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