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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue May 2015, 36 (3)                                     Back


nstantaneous and historical temperature effects on a-pinene

Aspergillosis and Aflatoxicosis associated with tubers and leaves of sweet potatoes (Ipomoea batatas) in Osun state,

South Western Nigeria 

 

Mojeed Oladapo Oyewale

Department of? Applied Science, Osun State Polytechnic, P.M.B. 301, Iree, Osun state, Nigeria

Author?s E-mail: mojeedoyewale@gmail.com

 

 

 

 Publication Data

Paper received:

29 April 2013

 

Revised received:

03 January 2014

 

Re-revised received:

19 August 2014

 

Accepted:

11 September 2014

 

Abstract

Tubers and leaves of sweet potatoes (Ipomoea batatas ) are often contaminated with Aspergillus infection due to aflatoxin production. The present study was carried out to investigate the extent of in-vivo aflatoxin production due to Aspergillus infection, in different genotypes of sweet potatoes with different morphological and phenotypic characteristics. The genotypes selected were TIS 8441, CIP Tanzania, TIS 8164, TIS 2532.OP1.13, TIS 87/ 0087 as well as Anamo Adayeba Pupa (local breed). Optimal aflatoxins were produced under aerobic conditions, at 30 ?C and high inoculum density during five days of incubation period. A strong relationship was observed between inoculum density and aflatoxin concentration. The physical and biochemical composition of the tubers and leaves of Anamo Adayeba Pupa makes it susceptible to Aspergillus infection and aflatoxin production. The fresh and dry leaves of Anamo Adayeba pupa, contained 2.208 ppb and 2.18 ppb of aflatoxins however, high levels of Aspergillosis was produced in the tubers with negligible amount of aflatoxins, however TIS 8441, CIP Tanzania, TIS 8164, `TIS 2532OP.1.13 were resistant to Aspergillus infection and aflatoxin production. The positive regression model showed correlation coefficient (R) value of 0.912 and 0.906 in fresh and dried leaves of Anamo Adayeba Pupa. A significant and positive correlation was found between Aspergillus infection and aflatoxin contamination. ?   

 

 

 Key words

Aflatoxicosis, Aspergillosis, Aspergillus flavus, Ipomoea batatas

 

 

 

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