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[9000694.] رقم البحث : 9000694 - |
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Suitability soybean cultivars for aspergillus flavus pathogenicity and aflatoxin production and some affecting factors / |
| تخصص البحث : General |
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Agricultural Research Journal Suez Canal University / / Volume 2 - 2003 |
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Arafa M. K. M |
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Heweidy M. A |
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Ismail I. A |
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Zohri A. A |
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soybean - Botany |
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Nine Aspergillus species were isolated from seeds of seven freshly harvested soybean cultivars. Aspergillus flavus and A. niger were the most frequent species from all tested cultivars. Seeds of H15L17 or Holladay soybean cultivars had the highest frequency of Aspergillus spp. while seeds of Giza 21 and Crawfored gave the lowest frequency. Only isolates of A. flavus and A. parasiticus could produce aflatoxin, however, other seven species could not. Artificial or natural inoculated seeds of soybean cultivars inoculated with spores of A. flavus caused the most decrease in seed germination and the highest increase in both seed invasion and/or aflatoxin production were found in the highly favourable of soybean cultivars (H15L17, Holladay and Toamo). In contrast, seeds of Giza 21, Giza35 and Giza 83 were partial resistance to establishment of A. flavus and aflatoxin accumulation. The cultivar (Crawford) was highly resistant without shown aflatoxin formation. The best vigor (mineral contents) was obtained from healthy seed of partially and highly unsuitable cultivars comparable to highly suitable cultivar for fungus infection.
The results also revealed the absence of significant variation in either total nitrogen or magnesium contents of the suitable, partially and highly unsuitable cultivars. Calcium, potassium and total phosphate content of both testa and kernels of the susceptible seeds were low as compared to those partially and highly resistant seeds, and vice versa with sodium and zinc contents. |
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