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Levels of Aflatoxin B1 Production in Seeds of Some Selected Varieties of Paddy and their Relation with Total Starch, Amylose and Amylopectin Contents

M. K. Singh and K. K. Sinha
University Department of Botany, T M Bhagalpur University, Bhagalpur - 812 007.
Abstract—Eleven varieties of paddy seeds were infested with a highly toxigenic strain of Aspergillus flavus under laboratory conditions. None of the varieties was totally immune to aflatoxin production but they facilitated aflatoxin production at varying levels. Minimum amount (52.37 ¦Ìg/kg) was elaborated on Swarna variety whereas maximum amount of aflatoxin B 1 (573.63 ¦Ìg/kg) was elaborated on Bauna Mansuri. On the basis of the amount of aflatoxin B 1 produced, these varieties were conveniently grouped into three categories; highly resistant (below 100 ¦Ìg/kg), moderately resistant (from 100-200 ¦Ìg/kg) and susceptible (above 200 ¦Ìg/kg). Only Swarna was considered highly resistant while seven varieties viz., Rajendera Sweta, Bhagalpuri Katarni, Rajendera Kasturi, Sita, JKRH-401, Birsa Dhan-201, Birsa Dhan-202, were found to be moderately resistant. Parvati, Tulsi Manjeri and Bauna Mansuri were grouped as susceptible varieties. It was further observed that varieties containing higher levels of starch supported higher levels of aflatoxin B 1 . A positive correlation was found between aflatoxin B 1 production and total starch as well as amylopectin content of the seeds whereas there was negative correlation between aflatoxin B 1 elaboration and amylose level of the seeds.

Index Terms—Aflatoxin B1, Toxigenic strain, Amylopectin content

Cite: M. K. Singh and K. K. Sinha, "Levels of Aflatoxin B1 Production in Seeds of Some Selected Varieties of Paddy and their Relation with Total Starch, Amylose and Amylopectin Contents," International Journal of Life Sciences Biotechnology and Pharma Research, Vol. 2, No. 2, pp. 222-226, April 2013.
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