Wiki一下，居然有天然的不含咖啡因的品系
The prospect for Decaffito-type coffees was shown by the discovery of the naturally caffeine-free Coffea charrieriana, reported in 2004. It has a deficient caffeine synthase gene, leading it to accumulate theobromine instead of converting it to caffeine. Either this trait could be bred into other coffee plants by crossing them with C. charrieriana, or an equivalent effect could be achieved by knocking out the gene for caffeine synthase in normal coffee plants.
【 在 defeatyou (lance~天地一沙鷗) 的大作中提到: 】
:  百度说有转基因的
:  能去除大部分kafyin
:  【 在 mammothcy 的大作中提到: 】
:  : 低咖啡因的原理应该是用有机溶剂把咖啡因萃取出来，所以很难想象有豆子    
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