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  1. 紀要
  2. お茶の水女子大學自然科學報告
  3. 18(1)

Studies on the Basic Physiological Conditions Affecting the Spore Germination of an Obligatorily Tonophilic Fungus

http://hdl.handle.net/10083/2137
http://hdl.handle.net/10083/2137
522fe36b-8ea1-41fa-bbc4-416e24d267ec
名前 / ファイル ライセンス アクション
KJ00004829645.pdf KJ00004829645.pdf (3.0 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2008-04-30
タイトル
タイトル Studies on the Basic Physiological Conditions Affecting the Spore Germination of an Obligatorily Tonophilic Fungus
言語
言語 eng
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
著者 Imai, Morieko

× Imai, Morieko

WEKO 69735

Imai, Morieko

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今井, 百里江子

× 今井, 百里江子

WEKO 69737

en 今井, 百里江子

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著者(ヨミ)
識別子Scheme WEKO
識別子 69736
姓名 イマイ, モリエコ
内容記述
内容記述タイプ Other
内容記述 Some basic physiological conditions affecting the ascospore germination of the obligatorily tonophilic fungus, Eurotium halophilicum forma A have been studied. This was facilitated by availability of a fungal strain which forms only ascospores. The results obtained are summarized as follows. 1. The process of ascospore germination in the obligatorily tonophilic fungus can be divided into two phases, swelling and sprouting. The swelling phase is divided into early and later stages. Spores in each stage can be distinguished morphologically. The early stage corresponds to the stage of exogenous swelling and the later to endogenous swelling of the conidiospores of Aspergillus niger. 2. The effect of environmental factors on the ascospore germination of the fungus have been studied in detail. The optimal conditions were 28°, 90% RH and pH 5.6-6.0. Dried malt-extract agar smeared on a slide-glass are found to be most favorable for aerial germination of ascospores. Spore germination occurs within the ranges of 15゜-37゜, 95-60% RH, and pH 1.8-10.6 on this culture medium. Heating of the spores at 50゜-100゜ before inoculation\
shows a suppressive and some times lethal effect. 3. Germination tests on dried simple agar medium have revealed that addition of various amino acids, vitamins (10-400μg/ml) and sugars (20mg/ml) to the basal suspension medium (Czapek's salt solution without C and N sources) are almost indifferent for germination. However, spore germination was promoted when a substance was added to the basal suspension medium together with sucrose (30mg per ml). And, pre-incubation of spores in the suspension medium at 28゜ for three weeks was most favorable for germination. It seems probable that external substances diffuse into the spore cells in an earlier stage, and certain metabolic change may take place at a later stage within the cell, whereupon the spores may be driven into the sprouting phase. 4. The effects of fifteen kinds of salts on germination have also been examined. On the whole, the salts, added to the suspension medium at higher concentrations showed suppressive effect on germination. The effect varies with the kind of salts and depends on a preincubation period. Among the salts tested, LiCl, LiNO_3 and NH_4NO_3 suppressed germination almost completely. However, the spores were able to germinate better, when salts were removed\
by washing. 5. Spores, whose germination was suppressed by highly concentrated salt solutions, recovered their capacity of germination after dilution of the salt solutions. In the case of NaCl, an optimal concentration (1.71M) lies between 5.13M and 0.005M salt solutions. As regards. LiCl and LiNO, suppressive effect decreased with an increase of dilution rate. On the other hand, decreases in spore number and a corresponding decreases in transmittance have been observed in the solutions of NaCl, MgCl_2 LiCl and NH_4NO_3 after pre-incubation at 28゜ for 7-9 hours in the concentrated solutions. From all these results, certain parallelism exist in the effects of salts during pre-incubation.
書誌情報 お茶の水女子大學自然科學報告

巻 18, 号 1, p. 21-55, 発行日 1967-07
ISSN
収録物識別子タイプ ISSN
収録物識別子 00298190
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AN00033958
フォーマット
内容記述タイプ Other
内容記述 application/pdf
形態
2997733 bytes
日本十進分類法
主題Scheme NDC
主題 400
出版者
出版者 お茶の水女子大学
資源タイプ
内容記述タイプ Other
内容記述 紀要論文
資源タイプ・ローカル
紀要論文
資源タイプ・NII
Departmental Bulletin Paper
資源タイプ・DCMI
text
資源タイプ・ローカル表示コード
03
所属
Department of Biology, Faculty of Science, Ochanomizu University
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