Fungi Associated with Natural Regeneration of Picea jezoensis CARR. in Seed. Stage -Their distribution on forest floors and pathogenicity to the seeds-
Fungi Associated with Natural Regeneration of Picea jezoensis CARR. in Seed. Stage -Their distribution on forest floors and pathogenicity to the seeds-
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与云杉自然再生相关的真菌 CARR。
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
T. Igarashi
中科院分区：
文献类型：
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作者：
D. Cheng;T. Igarashi
~~~7~~~~~~.~&~K~~ ~~*~。 - #1* -C' 0) 5t:;(P,& lffJt :H=- %t-t Q m JJJi: 11: ~ ,*,'l,\~=-- 摘要 175 通过从不同林地越冬的种子中分离真菌，检测分离真菌的致病性及其致病性，研究了真菌对种子期云杉自然再生的损害。从种子中经常分离出四种真菌：Racodium therryanum THUEM.、Arthrinium sp.，其中最常见的是 R. theryanum，一种众所周知的引起苗圃中针叶树幼苗黑雪枯病的病原体。与其他真菌一起发现：R. theryanum 对 P. jezoensis 种子具有致病性，而其他真菌则没有。 R. theryanum 与森林地面类型的分离表明，这种真菌既不存在于腐烂的倒下的树木上，也不存在于土壤倾斜的地面上，而是栖息在莎莎生长或树冠遮荫的地面上，并且主要分布在 Ao 层而不是土壤的 A 层中。土壤Ao层和用TMTD对种子进行消毒都大大减少了R. theryanum引起的种子腐烂。
~~~7~~~~~.~&~K~~ ~~*~. - #1* -C' 0) 5t:;(P,& lffJt :H=- %t-t Q m JJJi: 11: ~ ,*,'l,\~=-- Abstract 175 Damage caused by fungi to the natural regeneration of Picea jezoensis CARR. in seed stage was investigated, by making fungal isolations from seeds which had overwintered in various forest floors and examining the pathogenicity of the isolated fungi and their distribution in forest floors in relation to seed germination. From the seeds, four fungi were frequently isolated: Racodium therryanum THUEM., Arthrinium sp., and two unidentified ories. Among these the most frequently isolated was R. therryanum, a well known pathogen causing dark snow blight to conifer seedlings in nursery. A highly significant negative correlation was found between the R. therryanum isolation percentages from the seeds and the germination percentages of the seeds, but no such correlations were found with the other fungi: the pathogenicity of R. therryanum to P. jezoensis seeds was demonstrated while that of the other fungi was not. The isolation of R. therryanum in relation to the forest floor types suggested that this fungus subsists neither on rotten fallen trees nor in soil-raked floors, but inhabits Sasa-growing or canopy-shaded floors and is distributed in such areas mainly in the Ao layer rather than in the A layer of the soil. Removing the Ao layer of the soil and sterilizing the seeds with TMTD both greatly lessened the seed decay caused by R. therryanum.