Two alternative hypotheses can be used to explain how the embryo or embryonic axis controls food mobilization in seeds of many dicotyledonous plants. The first involves the production of a hormonal stimulus by the axis which initiates the development of optimal rates of hydrolytic enzyme activity in the storage organs. The second involves the continual operation of a source‐sink relationship between the storage organs (source) and axis (sink) during germination and early seedling development. The evidence for the operation of these modes of control is discussed.
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Davies et al. (1981) studied this question.
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