EFFECT OF TEMPERATURE AND PH ON WATER RELATIONS OF FIELD AND STORAGE FUNGI
EFFECT OF TEMPERATURE AND PH ON WATER RELATIONS OF FIELD AND STORAGE FUNGI
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DOI：
10.1016/s0007-1536(84)80213-2
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发表时间：
1984-01-01
期刊：
影响因子：
--
通讯作者：
LACEY, J
中科院分区：
文献类型：
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作者：
MAGAN, N;LACEY, J
以小麦提取液琼脂为培养基，研究了温度和pH对田间真菌曲霉和青霉菌群水分关系的影响。萌发、生长和产孢所需的最小水分活度（aw）在3组之间差异很大。孢子萌发现场所需的真菌从0.85瓦（alternnaria alternata, Cladosporium herbarum）到0.90瓦（Verticillium lecanii）；曲霉（Aspergillus spp.）： 0.71 aw (A. amstelodami) ~ 0.86 aw (A. fumigatus)；青霉菌属从0.79瓦（P. piceum）到0.83瓦（P. roquefortii）。在最适生长温度附近的最低水活度耐受值通常低于次优条件下的最低水活度耐受值。当pH值从6.5增加到4时，最适温度下的最低发芽率提高了约0.02 aw，边际温度下的最低发芽率提高了0.05 aw。pH值的变化也增加了发芽前的天数。一般来说，萌发的速率比线性生长的速率低，而线性生长的速率又比无性孢子萌发的速率低。
The effects of temperature and pH on the water relations of groups of field fungi, Aspergillus and Penicillium spp. [isolated from wheat grain] were studied in vitro using wheat extract agar. The minimum water activity (aw) necessary for germination, growth and sporulation varied considerably within and between the 3 groups. For spore germination field fungi required from 0.85 aw (Alternaria alternata, Cladosporium herbarum) to 0.90 aw (Verticillium lecanii); Aspergillus spp. 0.71 aw (A. amstelodami) to 0.86 aw (A. fumigatus); and Penicillium spp. from 0.79 aw (P. piceum) to 0.83 aw (P. roquefortii). The minimum water activity tolerated close to the optimum temperature for growth was usually lower than that tolerated under sub-optimal conditions. Altering the pH from 6.5 to 4 increased the minimum aw for germination by about 0.02 aw at optimum temperatures and 0.05 aw at marginal temperatures. The change in pH also increased the number of days before germination occurred. In general, germination occurred at a lower aw than linear growth which in turn occurred at a lower aw than asexual sporulation.