以下为句子列表：
英文: Florigen (flowering hormone) A hypothetical plant hormone that has been postulated to account for the transfer of the photoperiod stimulus from the leaves to the apex where flowering is induced.
中文: 成花激素：一种假定的植物激素，该假设用来解释来自于叶中，在茎端诱导成花的光周期刺激物质的转运。
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英文: The stimulus can be transferred from one plant to another by grafting, but attempts to isolate florigen have so far been unsuccessful.
中文: 该刺激物可通过嫁接从一个植株转移到另一植株，但目前还没有成功分离出成花激素。
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