Progeny differences of hinoki (Chamaecyparis obtusa) and sawara (C. pisifera) against resinous stem canker disease and spatial distribution of damage (disease severity) in a progeny test |
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| Authors: | Makoto Takahashi Minoru Mukouda Kenji Nishimura |
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| Institution: | (1) Tohoku Breeding Office, Forest Tree Breeding Center, 020-0173 Takizawa, Japan;(2) Kansai Breeding Office, Forest Tree Breeding Center, 709-4335 Okayama, Japan |
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| Abstract: | The incidence and severity of resinous stem canker disease were investigated in hinoki (Chamaecyparis obtusa) and sawara (C. pisifera) at a progeny test located in Yamatsuri Town, Fukushima Prefecture, Japan. Symptoms of the disease were observed in 307 trees
out of 933 investigated trees (32.9%). The damage was more severe on lower slopes than on upper slopes, indicating that micro-environmental
factors are causally associated with the occurrence of the disease. The severity of the disease varied both among nine open-pollinated
progenies derived from hinoki plus-tree clones and among 13 progenies derived from pollination between hinoki plus-tree clones
and the mixed-pollen of hinoki plus-tree clones. The severity of the disease also varied with height above the ground. This
tendency was most obvious where the disease was most severe. An estimation of the narrow sense heritability,h
2, of 0.214, was obtained from analysis of the 13 progenies derived from pollination with mixed-pollen. The heritability derived
from material that had not been subjected to selection against the disease, indicated that breeding to enhance resistance
would be possible to control the disease. The interaction between environments and progenies in relation to severity of the
disease is also discussed.
Ms. Setsuko Chiba and Mr. Mamoru Ueta gave us vigorous supports, and Mr. Haruki Orita, Dr. Tomiyasu Miyaura, and Dr. Shinichiro
Ito gave us many helpful comments. We deeply appreciated their cooperation. The study was supported by a grant from the Ministry
of Agriculture, Forestry. and Fisheries of Japan. |
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| Keywords: | Chamaecyparis obtusa Chamaecyparis pisifera disease severity heritability hinoki stem canker disease |
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