Abstract
Fungi associated with diseased seeds of Sesamum indicum L. from four markets in Jos and Okene central market were isolated to study the deteriorative changes in lipid content. In terms of number and fungal species abundance, Faringada market had the highest fungal occurrence, while Aspergillus chevaliari showed the highest percentage occurrence in that market. Visually healthy seeds of Sesanum indicum were inoculated with spores of each of the nine fungi isolated from diseased seeds and incubated at 25±20C for 7days. The healthy and fungal infected seeds were analysed for their lipid content. Significant decreases in lipid content were observed in the seeds inoculated with all the fungi except in seeds inoculated with G. candidum, which showed increase in lipid content. A. chevalieri was responsible for the maximum depletion of the lipid content of the seeds. The results clearly indicate that these fungal species are capable of depleting the lipid content in storage.
Highlights
Sesanum indicum is a high value ancient oil seed which is considered to be the oldest oil seed crop known to man for over 5000 years (Bedigian, 2012).Presently China, India and Myanmar are the leading producers of Sesame followed by Sudan, Nigeria, Pakistan, Bangladesh, Ethiopia, Thailand, Turkey and Mexico (FAO, 2004)
The results of this study showed that fungi were isolated from sesame seeds, indicating that the seed samples were highly infected with pathogens and could cause diseases in seeds
The presence of fungi on sesame seeds is in agreement with (Christensen and Kaufmann, 1974), who stated that fungi were the major cause of spoilage in stored grains and seeds
Summary
Sesanum indicum (family Pedialiaceae) is a high value ancient oil seed which is considered to be the oldest oil seed crop known to man for over 5000 years (Bedigian, 2012).Presently China, India and Myanmar are the leading producers of Sesame followed by Sudan, Nigeria, Pakistan, Bangladesh, Ethiopia, Thailand, Turkey and Mexico (FAO, 2004). Previous works on sesame seeds have indicated the presence of A. flavus among other fungi (Mbah and Akueshi, 2001). Considering the above facts, emphasis is given on to study the mycoflora of the seeds in this environment and the effect of growth of fungi on the lipid content of the seeds. The fungal colonies observed on the filter paper in the Petri dishes were transferred into sterilized Petri dishes containing freshly prepared Potato Dextrose Agar (PDA) to obtain pure cultures.
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