美国的转基因农产品，是标在包装袋上的PLU code 。

来源: 于 2013-12-30 14:46:10 [旧帖] [给我悄悄话] 本文已被阅读：次

for PLU code Fifth (Leading) Digit,

0   Applies to all non-qualified produce and is generally presented without the leading "zero" digit.
8   Genetically modified
9   Organic

for example: 
an organically grown banana would be 94011.
a genetically engineered vine ripe tomato would be 84805.

http://www.plucodes.com/docs/Users_Guide_July_2012_FINAL.pdf