This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via CrossRef Citing Articles via Web of Science (16) Citing Articles via Google Scholar Google Scholar Articles by Ames, I. H. Articles by Mistretta, P. W. Search for Related Content PubMed PubMed Citation Articles by Ames, I. H. Articles by Mistretta, P. W. Agricola Articles by Ames, I. H. Articles by Mistretta, P. W.

Articles

Auxin: Its Role in Genetic Tumor Induction ¹

^a Department of Anatomy, State University of New York, Upstate Medical Center, Syracuse, New York 13210

Seedlings of the tumor-prone amphiploid Nicotiana suaveolens X N. langsdorffii were grown on nutrient medium supplemented with indoleacetic acid (IAA) and scored at regular intervals for the incidence of tumor formation. IAA at 2 x 10^–5M caused a significant reduction in the rate of tumor formation. Plants were also grown on nutrient medium under two different intensities of illumination, and the endogenous level of IAA was determined in 23-day-old seedlings. Those grown under 2000 ft-c of illumination had a higher incidence of tumors and a significantly lower level of endogenous IAA than those grown under 500 ft-c of illumination. A correlation in time between decline in the endogenous level of IAA and onset of tumor formation was demonstrated in greenhouse-grown plants.