Abstract:

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(-5)m 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.

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Auxin: Its Role in Genetic Tumor Induction <sup><a href="#fn1" rid="fn1" class=" fn">1</a></sup>

I Ames

P Mistretta

Abstract

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 × 10^m 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.

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Ames IH. Endogenous levels of auxin and tumorigenesis in a Nicotiana amphiploid. Plant Physiol. 1974 Dec;54(6):953–955.[PMC free article] [PubMed] [Google Scholar]
Ames IH, Rice TB, Smith HH. Inhibition of tumor induction by auxin in totally debudded Nicotiana glauca x N. langsdorffii. Plant Physiol. 1969 Feb;44(2):305–307.[PMC free article] [PubMed] [Google Scholar]
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^{Department of Anatomy, State University of New York, Upstate Medical Center, Syracuse, New York 13210}

^{This work was supported by Grant BO-32864 from the National Science Foundation.}

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Abstract

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 × 10^m 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.

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