ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effect of Aspergillus niger on shoot emergence and vine development in field-sown yams (Dioscorea spp.) and rot development under long-term storage conditions.

Otusanya, M. O.; Jeger, M. J.;

International Biodeterioration & Biodegradation Year: 1996 Vol: 38 Issue: 2 Pages: 89-100 Ref: 32 ref.

1996

บทคัดย่อ

The effects of infection of seed yam by A. niger on shoot emergence and vine development were investigated in D. rotundata (TDr 179), D. alata (TDa 297) and D. esculenta (IITA). Shoot emergence was particularly poor in D. esculenta, which was attributed to a greater susceptibility to A. niger due to the relatively smaller size of the tuber, less compact inner tissue and thinner periderm. Reductions in field emergence in all 3 species were attributed to both A. niger infection and insect damage. An additional factor, dormancy, was suggested in D. esculenta. D. alata seed yams inoculated after bruising produced a higher number of shoots than D. rotundata and D. esculenta. It is suggested that the bruising may have stimulated the release of beta -sitosterol, an antifungal compound known to be present in the periderm of this species. The high numbers of shoots produced are thought to be an additional response to A. niger infection. The development and control of A. niger rot on seed yam tubers was i

nvestigated under long-term storage conditions. D. alata was the most resistant, and D. rotundata and D. esculenta equally susceptible, but D. esculenta lost wt more rapidly than the other species. The relatively less compact inner tissue and thinner periderm in D. esculenta were associated with high susceptibility and rapid wt loss. Benzoic acid, within the acceptable tolerance level in foods, was as effective as the widely used fungicide Benlate [benomyl] for rot control. Sterilization of tubers using sodium hypochlorite solution was ineffective.