Saccharomyces cerevisiae protects maize plants, under greenhouse conditions, against Colletotrichum graminicola
1992
Silva, S.R. da (Biological Institute, Sao Paulo (Brazil)) | Pascholati, S.F.
This research was carried out to study the protection of maize leaves against Colletotrichum graminicola, the causal agent of anthracnose, by previous or simultaneous applications of suspensions or filtrates of Saccharomyces cerevisiae obtained from commercial baker's yeast. The parameters evaluated involved conidium germination and appressorium formation by C. graminicola as well as lesioned leaf area, number of lesions, and sporulation capacity of the fungus on the leaves. Suspensions from washed or non-washed S. cerevisiae cells and filtrates of these suspensions reduced the development of C. graminicola as well as the expression of anthracnose on leaves when they were previously or concomitantly treated with these preparations. In the same way, when cells of S. cerevisiae were isolated from commercial baker's yeast and grown in potato-dextrose-agar medium, the cell suspensions and their filtrates were also able to reduce the development of C. graminicola and the expression of the disease on the leaves. The different yeast preparations and their filtrates were shown to be thermolabile. The reduction of the development of C. graminicola and disease expression on the leaves when filtrates of cell suspensions of S. cerevisiae were used, suggest that the presence of the yeast cell is not necessary to protect the leaves. Therefore, a thermolabile substance or a complex of substances can be released from the cells into the filtrates. In vitro experiments showed that S. cerevisiae cells exhibit a possible antagonistic activity against C. graminicola due to antibiosis
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