Abstract
Movement of [14C]kinetin and [14C]gibberellic acid was examined in cotton (Gossypium hirsutum L.) cotyledonary petiole sections independent of label uptake or exit from the tissue. Sections 20 millimeters in length were taken from well watered, stressed, and poststressed plants. Transport capacity was determined using a pulse-chase technique. Movement of both kinetin and gibberellic acid was found to be nonpolar with a velocity of 1 millimeter per hour or less, suggesting passive diffusion. Neither water stress nor anaerobic conditions during transport of labeled material affected the transport capacity of the petioles.
Results suggested strong kinetin binding but weak gibberellic acid binding in the tissue sections. Apparent binding of both growth regulators was unaltered by the experimental conditions. Movement of these two growth regulators within cotton cotyledonary petioles plays a minor role in the stress-induced, foliar abscission process.
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Davenport T. L., Jordan W. R., Morgan P. W. Movement and Endogenous Levels of Abscisic Acid during Water-Stress-induced Abscission in Cotton Seedlings. Plant Physiol. 1977 Jun;59(6):1165–1168. doi: 10.1104/pp.59.6.1165. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Davenport T. L., Morgan P. W., Jordan W. R. Auxin Transport as Related to Leaf Abscission during Water Stress in Cotton. Plant Physiol. 1977 Apr;59(4):554–557. doi: 10.1104/pp.59.4.554. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lagerstedt H. B., Langston R. G. Translocation of radioactive kinetin. Plant Physiol. 1967 May;42(5):611–622. doi: 10.1104/pp.42.5.611. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Morgan P. W., Durham J. I. Ethylene-induced Leaf Abscission Is Promoted by Gibberellic Acid. Plant Physiol. 1975 Feb;55(2):308–311. doi: 10.1104/pp.55.2.308. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Scholander P. F., Bradstreet E. D., Hemmingsen E. A., Hammel H. T. Sap Pressure in Vascular Plants: Negative hydrostatic pressure can be measured in plants. Science. 1965 Apr 16;148(3668):339–346. doi: 10.1126/science.148.3668.339. [DOI] [PubMed] [Google Scholar]
- Veen H., Jacobs W. P. Movement and metabolism of kinetin-C and of adenine-C in coleus petiole segments of increasing age. Plant Physiol. 1969 Sep;44(9):1277–1284. doi: 10.1104/pp.44.9.1277. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Zabadal T. J. A water potential threshold for the increase of abscisic Acid in leaves. Plant Physiol. 1974 Jan;53(1):125–127. doi: 10.1104/pp.53.1.125. [DOI] [PMC free article] [PubMed] [Google Scholar]