Progress in Essential Oils
By: Brian M. Lawrence
Posted: March 19, 2009, from the March 2009 issue of P&F magazine.
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Del Rio et al. (1998a) determined that the highest level of polymethoxyflavones accumulated during the developments of young citrus fruits. The same authors (1998b) observed that polymethoxyflavones might help the citrus fruit combat various fungal diseases. Del Rio et al. (2004) further studied the effect of hesperidin, isonaringin and the polymethoxyflavones (sinensetin, nobiletin, tangeretin, and heptamethoxyflavone)
on resistance to brown rot lesion caused by Phytophthora citrophthora. This was demonstrated by the fact that when the citrus fruit (‘Valencia late’ in this case) were
infected with P. citrophthora the hesperidin and naringenin contents dropped by 13% and 67%, respectively, while the hesperetin and naringenin (the corresponding aglycones)increased.
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