Combining Ability and Reciprocal Difference in Resistance to Basal Bending by Snow Pressure in Sugi (Cryptomeria japonica) Estimated from Full-diallel Crosses at Stand Age 10.

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  • Miyashita Tomohiro
    Tohoku Regional Breeding Office, Forest Tree Breeding Center, Forestry and Forest Products Research Institute
  • Nakada Ryogo
    Forest Tree Breeding Center, Forestry and Forest Products Research Institute

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  • １０年生スギのフルダイアレル交配家系から推定した雪圧による根元曲がり抵抗性の組合せ能力と正逆交配間差
  • 10ネンセイ スギ ノ フルダイアレル コウハイ カケイ カラ スイテイ シタ セツアツ ニ ヨル ネモト マガリ テイコウセイ ノ クミアワセ ノウリョク ト セイ ギャクコウハイ カンサ

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Abstract

Diallel analyses were performed on basal bending due to snow pressure in sugi (Cryptomeria japonica). Four mating sets, which consisted of 5×5 diallel crosses excluding self-pollinated families, from different trials were investigated at stand age 10. The results of ANOVA showed that significant effects of the general combining ability (GCA) were observed in the three data sets and that special combining ability was not observed in all the data sets. Relationships between the averages of crossing families in each trial and estimated GCA of their parents were investigated. The averages were estimated precisely from parents’ GCA in the three data sets, and significant differences in GCA between mating parents were observed. Reciprocal differences of GCA were not observed in all the data sets. Furthermore, the maternal and paternal averages were equivalent, and their relationships on the intercept and slope of the regression line were 0 and 1, respectively. It is concluded that reciprocal difference has little influence on basal bending.

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