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
Economy of Assam tea. Assam produces some of the finest and most expensive teas in the world. Other than the Chinese tea variety "Camellia sinensis", Assam is the only region in the world that has its own variety of tea, called "Camellia assamica". Assam tea is grown at elevations near sea level, giving it a malty sweetness and an earthy flavor, as opposed to the more floral aroma of highland (e.g. Darjeeling, Taiwanese) teas. Assam also accounts for fair share of India’s production of rice, rapeseed, mustard, jute, potato, sweet potato, banana, papaya, areca nut and turmeric. Assam is also a home of