期刊
FUNGAL BIOLOGY
卷 116, 期 6, 页码 637-642出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.funbio.2012.03.003
关键词
Aspergillus flavus; a(w); Maize; Sporulation; Temperature
类别
资金
- Italian Ministry of Agriculture (MIPAAF), MICOPRINCEM project
A key step in the infection cycle by Aspergillus flavus in maize is sporulation of sclerotia present in soil or in crop debris. However, little information is available on this critical and important phase. This study included experiments on artificial (Czapek Dox Agar (CZ)) and natural (maize stalks) substrates under different conditions of temperature (T; from S to 45 degrees C) and water activity (a(w); from 0.50 to 0.99) levels to quantify sporulation from sclerotia. The mean numbers of spores were higher on defined nutritional medium in vitro on CZ agar than on maize stalks (4.5 x 10(6) spores/sclerotium versus 4.2 x 10(4) spores/sclerotium) with production initiated after 6 and 24 h, respectively. Surprisingly, the optimal temperature was found at 30-35 degrees C for CZ agar (9.23 x 10(6) spores/sclerotium) and to be 20-25 degrees C for maize stalks (6.26 x 10(4) spores/sclerotium). Water stress imposition only reduced sporulation at <= 0.90 a(w). With more available water no significant differences were found between 0.90 and 0.99 a(w). This type of data is critical in the development of a mechanistic model to predict the infection cycle of A. flavus in maize in relation to meteorological conditions. (C) 2012 The British Mycological Society. Published by Elsevier Ltd. All rights reserved.
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