Abstract
A system is described for the examination of phototropism in the epicotyl of a dicot seedling, mung bean (Phaseolus aureus Roxb.), under conditions approximating nature, including the use of intact, nonetiolated plants exposed to elevated, continuous, white, unilateral light. It is found that in this system perception of the phototropic stimulus by the leaves alone cannot account for the curvature, and that exposure of the stem is also necessary. The phototropic response was found to be strongly altered in nonintact plants. Hypobaric treatment indicates that ethylene may participate in phototropism, possibly by acting as an inhibitor of auxin transport.
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Abeles F. B., Rubinstein B. Regulation of Ethylene Evolution and Leaf Abscission by Auxin. Plant Physiol. 1964 Nov;39(6):963–969. doi: 10.1104/pp.39.6.963. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Burg S. P. Ethylene in plant growth. Proc Natl Acad Sci U S A. 1973 Feb;70(2):591–597. doi: 10.1073/pnas.70.2.591. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Craker L. E., Abeles F. B., Shropshire W. Light-induced Ethylene Production in Sorghum. Plant Physiol. 1973 Jun;51(6):1082–1083. doi: 10.1104/pp.51.6.1082. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Everett M. Dose-response curves for radish seedling phototropism. Plant Physiol. 1974 Sep;54(3):222–225. doi: 10.1104/pp.54.3.222. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kang B. G., Burg S. P. Red light enhancement of the phototropic response of etiolated pea stems. Plant Physiol. 1974 Mar;53(3):445–448. doi: 10.1104/pp.53.3.445. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lam S. L., Leopold A. C. Role of leaves in phototropism. Plant Physiol. 1966 May;41(5):847–851. doi: 10.1104/pp.41.5.847. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Morgan P. W., Gausman H. W. Effects of ethylene on auxin transport. Plant Physiol. 1966 Jan;41(1):45–52. doi: 10.1104/pp.41.1.45. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Naqvi S. M., Gordon S. A. Auxin Transport in Zea mays Coleoptiles II. Influence of Light on the Transport of Indoleacetic Acid-2-C. Plant Physiol. 1967 Jan;42(1):138–143. doi: 10.1104/pp.42.1.138. [DOI] [PMC free article] [PubMed] [Google Scholar]