Effect of Some Isomeric Purine Analogues on Germination of Lettuce Seed.

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Abstract
Stimulation of lettuce seed germination by some 6-(substituted) aminopurines were compared with analogous 4-(substituted)aminopyrazolo(3,4-d)pyrimi-dines. None of the latter derivatives stimulated germination, even though the identical side chain was present, and in the same relative position in the pyrimidine portion of the molecule. The substituted group may vary within wide limits; however, the purine moiety itself appears to be more specific for seed germination activity. The appropriate side chain may be attached to the 6 position of the purine nucleus by either N, S or O, and still retain biological activity.

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