Kushalappa, A.C. and Bartz, J.A. and Norden, A.J. (1979) Susceptibility of Pods of Different Peanut Genotypes to Aspergillus flavus Group Fungi. Phytopathology, 69 (2). pp. 159-162.
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Abstract
Pods and seeds from 17 groundnut genotypes were tested for resistance to colonization by A. parasiticus after each of 2 successive growing seasons. In each year's tests, pods of 3 genotypes remained completely free from colonies of the test fungus, whereas all pods of 2 genotypes in the 1st year and of 3 genotypes in the 2nd year had at least 1 colony. The percentage of inoculated pods with surface colonies of A. parasiticus was not directly proportional to that of inoculated seeds; rather, they were inversely correlated. Groundnuts selected for resistance to A. parasiticus through the standard inoculated seed assay would therefore usually produce pods that are more susceptible to colonization than would genotypes producing more susceptible seed. The shell of the intact pod seemed to provide an effective barrier to A. parasiticus. The quantity of aflatoxin B1 in seeds of 4 genotypes was correlated with the percentage of pods with surface colonies at 21 days after inoculation. The latter values were also correlated with the percentage of seeds that had been penetrated and those with surface colonies, respectively. Resistance of pods to A. parasiticus, however, may not be a true plant resistance, since genotypes that were relatively resistant one year were susceptible the next, and vice versa. Colonies arising from natural infections occurring before the pods were inoculated accounted for only 3 of the 7 significant changes in the percentage of pods with colonies between the 2 tests.ADDITIONAL ABSTRACT:Pods and seeds from 17 varieties or breeding lines were tested for resistance to colonization by A. parasiticus after each of two successive growing seasons. In each year's tests, pods of three of them remained completely free from infection whereas all pods of two in the first year and three in the second had at least one fungal colony. The percentage of inoculated pods with surface colonies of A. parasiticus was inversely correlated with the percentage of inoculated seeds. Thus plants selected for resistance to A. parasiticus by the standard inoculated seed assay would usually produce pods more susceptible to colonization than those of varieties or lines producing more susceptible seed. Aflatoxin B1 content in seeds of four lines was correlated with the percentage of pods with surface colonies 21 days after inoculation. Pod resistance may not be genetically determined since it varied inconsistently from year to year; natural infection before artificial inoculation did not account for the inconsistencies
| Item Type: | Article |
|---|---|
| Additional Information: | SNNigam Collection |
| Uncontrolled Keywords: | Arachis hypogaea L,, groundnut, mycotoxins |
| Author Affiliation: | University of Florida, Gainesville, USA |
| Subjects: | Plant Protection Crop Improvement |
| Divisions: | Groundnut |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 07 Aug 2013 10:40 |
| Last Modified: | 07 Aug 2013 10:40 |
| Official URL: | http://dx.doi.org/10.1094/Phyto-69-159 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/11351 |
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