[Indoleacetic acid levels in the potato organs during various stages of ontogenesis and the role their dynamics in the tuber growth regulation].

During ontogenesis of the potato (Solanum tuberosum L.), the content of indoleacetic acid (IAA) in different organs was determined. The dynamics of IAA in the leaves corresponded to changes in photosynthetic activity. The treatment with IAA increased the intensity of photosynthesis. It was shown that the IAA content increased in the leaves and that IAA ascended to the stem basal part in the second half of vegetation. The accumulation of IAA in the stem basal part gave rise to a positive gradient of sugar in the stem, differentiation of stolons and transport of assimilate in the grown tubers. A correlation was found between the content of IAA in tubers and the rate of its growth.