1. Freshly-harvested potatoes (Benimaru or Danshyaku) will sprout if seaked in buffer solution (pH 3.5) of IAA or NAA of the physiological concentration, whereas oldly-harvested will not take place sprouting.
2. Peeling of the potatoes promotes the sprouting of both freshly-and oldly-harvested tubers, and if the peeled potatoes were treated with auxin, the sprouting is much hastened.
3. In the case of 1 and 2, it weakened the polarity of sprouting and it sprouts more than one bud in each node.
4. Both in the terminal and the lateral bud of the dormant potato-tubers not so much free auxin was observed as in the naturally sprouted tubers, and in the latter case greater amount of auxin was observed in the terminal bud than the lateral bud.
5. Auxin was increased both in the terminal and the lateral buds of the peeled or auxin- treated tubers, and this increasement is as large as the sum of the auxin obtained from the peeled and auxin-treated ones, if it is treated with auxin after the peeling.
6. The auxin of the peeled potato-tubers is neither indoleacetic acid nor traumatic acid, but it has the same effect as indoleacetic acid upon the curvature of
Avena coleoptile and sprouting of potato-tubers.
7. The dormancy of the potato-tubers will be induced the inhibiting effect of the auxin precursor of the potatoes, the sprouting of dormant and on-dormant potatoes will be regulated by the auxin and its precursor, and the sprouting effect of the peeling is only taken place through the production of auxin.
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