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SUMMARY

Gibberellin Ai breaks the dormancy of hazel seed. Both GA1 and GA3 are transported more readily from embryonic axis to cotyledon than in the reverse direction. Since both gibberellins stimulate axis growth more rapidly when applied directly to it than when applied to the cotyledon, it seems likely that gibberellins directly affect the axis. This is confirmed by a rapid response of excised axes to gibberellic acid in liquid culture.