Studies on seed-borne pathogens of some nigerian melons

Abstract

Fungi associated with three cultivars of melon seeds were investigated. The mycoflora were found to be more on the unshelled than on the shelled seeds of all the three cultirars tested. A total of nine fungal genera were isolated and identified while two were unidentified. C. vulgaris was infected with all the nine genera including the two unidentified genera. Percentage incidence of infection was observed to be higher for the unshelled than with the shelled seeds for all the cultivars. The genus, Aspergillus was the most predominant, with A. niger topping the list followed by R. stolonifer and the least was A. flavus. In view of the harmful effects of aflatoxin production by Aspergillus spp caution must be exercised in the consumption of stored 'egusi' until an adequate control measure is in place.

Co-occurrence of aflatoxins, ochratoxin A and citrinin in “egusi” melon (Colocynthis citrullusL.) seeds consumed in Ireland and the United Kingdom

“…have been isolated from "egusi" (Chiejina 2006;Bankole et al 2006a), OTA and CIT have not been detected in "egusi". Although Adebajo et al (1994) reported that Aspergillus ochraceus isolated from melon seed produced OTA in vitro, our study presents evidence that OTA along with CIT can contaminate "egusi" and that they can co-occur with AFs.…”

Klorofil Floresan Metodu ile Ayrılan Farklı Olgunluk Dönemlerindeki Biber Tohumlarında Canlılık Parametrelerinin Tespiti

“…ve Aspergillus spp. (Al-Kassim et al, 2000), salatalık tohumlarının embriyo, kotiledon, testa kısmından Macrophomina phaseolina (Sultana et al, 2009), kavun tohumlarında , en baskın tür sırasıyla Aspergillus niger, Rhizopus stolonifer ve en az oranda Aspergillus flavus (Chiejina 2006) izole edilmiştir. Habib et al (2007), yerel tohum satılan işletmelerden toplanılan farklı patlıcan çeşitlerinden Alternaria alternata, Aspergillus flavus, Culvularia lunata, Fusarium oxysporum ve Fusarium solani tespit etmişlerdir.…”

Efficacy of three botanicals on postharvest fungal contaminants of melon (Citrullus colocynthis) kernels

“…Many groups of fungi are known to contaminate Egusi seeds during storage. They reduce seed storability, quality, export and marketability potentials; and above all deposit a large number of metabolites in the seeds; some of which are toxic to humans (Chiejina, 2006;Atehnkeng et al, 2008). Fungi species belonging to the genera Rhizopus, Penicillium amongst others have been reported as seed pathogens of Nigerian stored Egusi seed.…”

“…Fungi species belonging to the genera Rhizopus, Penicillium amongst others have been reported as seed pathogens of Nigerian stored Egusi seed. Many storage fungi that have been variously implicated in the spoilage of fruits and vegetables have been isolated from Egusi seeds by various authors (Chiejina, 2006;Aboloma et al, 2009;. Fungal deterioration of seeds occurs in form of rot, sclerotization of seed, and seed discolourization (Shetty 1992).…”

“…Bankole (1993) reported as many as 13 storage fungal species in stored Egusi seeds. Also, Chiejina (2006) isolated thirteen different fungal species and two unidentified species from Egusi seed kernel. These fungi are widely distributed and almost always present on the seeds during storage.…”