In-vitro meat may be OK for vegetarians. Could in-vitro vegetables be OK to fruitarians, for similar reasons?!

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Technically, this is already done to a certain extent. It's called GMO or genetically modified organisms in plants. A worrisome issue in GMO foods is the ability of a food to trigger an allergy in humans. Alternately, a new allergen could be produced when genes are mixed across different species.Another potential downside to GMO technology is that other organisms in the ecosystem could be harmed, which would lead to a lower level of biodiversity. For example, by removing one pest that harms the crop, you could be removing a food source for an animal. Also, GM crops could prove toxic to an organism in the environment, leading to reduced numbers or extinction of that organism.