Effect ofAspergillus parasiticus soil inoculum on invasion of peanut seeds

Horn, B.W. and Dorner, J.W. and Greene, R.L. and Blankenship, P.D. and Cole, R.J. (1994) Effect ofAspergillus parasiticus soil inoculum on invasion of peanut seeds. Mycopathologia, 125 (3). pp. 179-191.

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Environmental control plots adjusted to late season drought and elevated soil temp. were inoculated at groundnut planting with low and high levels of conidia, sclerotia and mycelium from a brown conidial mutant of A. parasiticus. The percentage infection of groundnut seeds from undamaged pods was greatest for the subplot containing the high sclerotial inoculum (15 sclerotia/cm² soil surface). Sclerotia did not germinate sporogenically and may have invaded seeds through mycelium. In contrast, the mycelial inoculum (colonized groundnut seed particles) released large numbers of conidia into the soil. Soil conidial populations of brown A. parasiticus from treatments with conidia and mycelium were positively correlated with the incidence of seed infection in undamaged pods. The ratio of A. flavus to wild-type A. parasiticus in the soil shifted from 7:3 to 1:1 in the uninoculated subplot after instigation of drought, whereas in all subplots treated with brown A. parasiticus, the ratio of the 2 species became c. 8:2. Despite high levels of brown A. parasiticus populations in the soil, native A. flavus often dominated groundnut seeds, suggesting that it was a more aggressive species. Sclerotia of wild-type A. parasiticus formed infrequently on preharvest groundnut seeds from insect-damaged pods

Item Type: Article
Additional Information: SNNigam collections
Author Affiliation: National Peanut Research Laboratory, USDA-ARS, Dawson, GA 31742, USA.
Subjects: Plant Protection
Soil Science and Microbiology
Crop Improvement
Divisions: Groundnut
Depositing User: Mr T L Gautham
Date Deposited: 08 Aug 2013 12:45
Last Modified: 08 Aug 2013 12:45
Official URL: http://dx.doi.org/10.1007/BF01146524
URI: http://eprints.icrisat.ac.in/id/eprint/11391

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