ROLE OF THE ROOT IN THE TRANSLOCATION OF PRODUCTS OF PHOTOSYNTHESIS IN SUGAR BEET, SOYBEAN, AND PUMPKIN
- 1 October 1967
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Botany
- Vol. 45 (10), 1811-1822
- https://doi.org/10.1139/b67-194
Abstract
The influence of root function on the export of 14C-labelled products from leaves of sugar beet, soybean, and pumpkin plants was examined with reference to the concept of a circulatory mechanism for translocation. When roots were placed on demineralized water for periods up to 10 days, oxygen uptake rates were reduced. In sugar beet, this was accompanied by an apparent stimulation of about 21% in the quantity of labelled sugar exported from the leaf. In soybean and pumpkin the quantity of export was not altered, but the distribution of exported 14C in the plant was modified to favor a decrease in the proportion recovered from the young parts and an increase in that from the stem and root. The absence of nutrient in the root medium did not result in any significant changes in the pattern of slow metabolism of the sugar translocated to the roots of sugar beet or soybean. In the pumpkin, the proportion of radioactivity recovered in the amino acids was lower, and glyceric acid accumulated in the fed leaf. When portions of the sugar beet root were excised 30 min before assimilation of 14CO2 by a leaf, the quantity of labelled sucrose exported during a 30-min interval was reduced to about 25% of normal, but the apparent velocity of translocation was not altered and the reduction in quantity could be eliminated by extending the time allowed for export. These results led to the conclusion that the root does not exert a controlling influence on translocation, but that it can contribute to the efficiency of the process.This publication has 5 references indexed in Scilit:
- TRANSLOCATION OF THE PRODUCTS OF PHOTOSYNTHESIS IN SUGAR BEET PETIOLESCanadian Journal of Botany, 1965
- Selective translocation of products of photosynthesis in soybeanPlant Physiology, 1961
- EVIDENCE FOR DIFFERENT KINDS OF CONCURRENT TRANSLOCATION OF PHOTOSYNTHETICALLY ASSIMILATED C14 IN THE SOYBEANCanadian Journal of Botany, 1959
- Mechanisms of Absorption, Transport, Accumulation, and Secretion of IonsAnnual Review of Plant Physiology, 1955
- Translocation from Soybean Leaves, II.Plant Physiology, 1955