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Alternaria mycotoxins in black rot lesion of tomato fruit: Conditions and regulation of their production


Alternaria represents the most common decay organism of the post-harvest tomato fruit. The prevalent type of decay, black rot lesion, is caused byA. alternata which may invade tomato tissue damaged by sun scald.Aspergillus niger, A. flavus andRhizopus stolonifer come in the second count level and occupy high to moderate occurrence. The mainly natural mycotoxins produced in rotted tomato are alternariol (AOH), alternariol monomethyl ether (AME), and tenuazonic acid (TA). Altertoxin I & II (AT-I & AT-II), in addition to AOH, AME and TA were produced by localA. alternata in a synthetic medium. The optimum temperature for toxin production byA. alternata IMI 89344 was 28 °C for AOH and AME, 21 °C for TA, and 14 °C for AT-I and AT-II. The growth and toxin were produced in a noticeable amount at 7 °C but drop at 35 °C. Significant inhibition in these toxins was attained at 500 ppm cinnamon oil in YES-Czapeks medium and in a tomato homogenate.

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Hasan, H.A.H. Alternaria mycotoxins in black rot lesion of tomato fruit: Conditions and regulation of their production. Mycopathologia 130, 171–177 (1995).

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