Biological characteristics ofCryptosporiopsis abietina on Hinoki cypress and its antagonistic effect to other microorganisms |
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Authors: | Shigeru Kaneko Yasuaki Sakamoto Tomoya Kiyohara |
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Institution: | (1) Forestry and Forest Products Reseach Institute, Kukizaki, 305 Inashiki-gun, Ibaraki, Japan;(2) Hokkaido Research Center, Forestry and Forest Products Research Institute, Hitsujigaoka, 062 Sapporo, Japan |
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Abstract: | In isolation tests on different parts of sound Hinoki cypress (Chamaecyparis obtusa), the coelomyceteCryptosporiopsis abietina was isolated, mostly from immature cone scales and inner bark areas of branches and main stems. In isolation tests using
branches or stems of 3-yr-old seedlings to 35-yr-old adult cypresses from various localities,C. abietina was isolated in 28 to 100% of the cypresses tested. It was also confirmed that the fungus rarely infects seeds of the cypress,
and can survive in dried seeds for several years, though it is not a seed-borne fungus. No symptoms appeared in inoculation
tests with the fungus on 8-yr-old cypress. In inoculation test in a greenhouse, reliable infection without symptoms was obtained
on wounded cypress seedlings. These results reveal thatC. abietina is a common endophytic fungus in Hinoki cypress. Confrontation and volatile antagonistic tests in Petri dishes indicated
that some isolates ofC. abietina produce antifungal substances in vitro. On these isolates, the reproduction of a mycophagous nematodeBursaphelenchus xylophilus was retarded. The results of inoculation tests suggest that the possibility ofC. abietina as a primary causal agent of the resinous stem canker of Hinoki cypress is low. The role ofC. abietina in the cypress is briefly discussed. |
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Keywords: | antagonism Cryptosporispsis abietina endophytic fungus mycophagous nematode Pezicula livida resinous stem canker |
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