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heirloom tomato
An heirloom tomato (also called heritage tomato in the UK) is an open-pollinated (non-hybrid) heirloom cultivar of tomato. Heirloom tomatoes have become increasingly popular and more readily available in recent years. According to tomato experts Craig LeHoullier and Carolyn Male, heirloom tomatoes can be classified into four categories: family heirlooms, commercial heirlooms, mystery heirlooms, and created heirlooms. They are grown for a variety of reasons, such as historical interest, access to wider varieties, and by people who wish to save seeds from year to year, as well as for their taste, which is widely perceived to be better than modern tomatoes.〔(【引用サイトリンク】title=Heirloom Tomatoes )〕 They usually have a shorter shelf life, but are generally more disease resistant than most commercial tomatoes, except for specific disease(s), for which a commercial hybrid was bred to be resistant. Furthermore, some scientists have suggested that heirloom tomatoes are no more natural than commercial ones, and that many are simply "inbred" tomatoes.
== Taste ==
Many heirloom tomatoes lack a genetic mutation that gives tomatoes an appealing uniform red color while sacrificing the fruit's sweet taste. Varieties bearing this mutation, which have been favored by industry since the 1940s, feature fruits with lower levels of carotenoids and a decreased ability to make sugar within the fruit.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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