Relationship between resistance to vole browsing and content of ether extract in the bark of larch species and hybrids |
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Authors: | Eiji Hayashi Kazuya Iizuka Shin-ichi Sukeno Kohzo Kohno |
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Affiliation: | (1) Hokkaido Breeding Office, Forest Tree Breeding Center, Ebetsu, 069-0836 Hokkaido, Japan;(2) Oji Paper Co. Ltd., Forestry Research Institute, Kuriyama Research Center, Kuriyama, 069-1508 Hokkaido, Japan;(3) Present address: Forest Tree Breeding Center, 319-1301 Juo, Ibaraki, Japan |
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Abstract: | We determined the survival rate of tree families produced by the intra- and interspecific crossing of larch species damaged by browsing of vole (Clethrionomys rufocanus bedfordiae Thomas) and the contents of ether extracts (EE) in their bark. The average survival ofLarix gmelini var.japonica Pilg. (L. gmelini)×L. gmelini (G×G) was highest, followed by the hybridL. gmelini×L. leptolepis Gordon (G×L). The families of the hybrid G×L, which is considered suitable for silviculture in Hokkaido, Japan, showed significant differences in survival rates, suggesting that it is possible to produce improved varieties of the hybrid which are more resistant to vole browsing. The EE contents of the bark were under strong hereditary control, and the rank of the EE content among the various families hardly fluctuated between the location of the test fields. The correlation coefficient between the survival rates and the EE contents was highly significant (r=0.89,n=24,p<0.01), indicating that the EE content in the bark may be used as a possible index of resistance or susceptibility to vole browsing in larch plantations. A part of this report was presented at the 106th Annual Meeting of the Japanese Forestry Society, at Sapporo, April, 1995. |
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Keywords: | Clethrionomys rufocanus bedfordiae Thomas content of ether extract Larix gmelini var.japonica Pilg. Larix leptolepis Gordon resistance to vole browsing |
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