Decaffeination 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. Tea may also be decaffeinated, usually by using processes analogous to the direct method or the CO process, as described above. The process of oxidizing tea leaves to create black tea ("red" in Chinese tea culture) or oolong tea leaves from green leaves does not affect the amount of caffeine in the tea, though tea-plant subspecies (i.e., "Camellia sinensis sinensis" vs. "Camellia sinensis assamica") may differ
History of tea now the largest exporter of tea to the United Kingdom. There is also a great consumption of tea in Chile. In South Africa, the non-Camellia sinensis beverage rooibos is popular. In South America yerba mate is a popular infused beverage. The only European plantation is Chá Gorreana, located in Ribeira Grande, São Miguel island, Azores (Portugal). In South America, the tea production in Brazil has strong roots due to the country's origins in Portugal, the strong presence of Japanese immigrants and also because of the influences of their neighbor's yerba mate culture. Brazil had a big tea production until the