A simple theory regarding ambimobility of xenobiotics with special reference to the nematicide, oxamyl.
Reads0
Chats0
TLDR
It is argued that the nematicide, oxamyl, is near the optimum permeability under some experimental conditions and depending on the permeability of the xenobiotic, there can be passive accumulation of xenobiotics in the sieve tubes in the carbohydrate sink regions.Abstract:
A theory is presented to explain the phloem mobility of certain systemic xenobiotics that are not weak acids. It is shown that there is a theoretically optimum permeability that permits optimum circulation through the symplasm and apoplast (including the phloem and xylem) of Solanum tuberosum plants. The optimum permeability is large enough to permit substantial passive permeation into sieve cells in the source leaf and yet is small enough to permit phloem transport with some retention. The optimum permeability is a function of the velocity of sap flow in sieve tubes, the radius of the sieve tube, the over-all length of the plant, and the length of the carbohydrate and xenobiotic sources. It is argued that the nematicide, oxamyl, is near the optimum permeability under some experimental conditions. It is shown that depending on the strength of the carbohydrate sink in roots or growth points and depending on the permeability of the xenobiotic, there can be passive accumulation of xenobiotics in the sieve tubes in the carbohydrate sink regions.read more
Citations
More filters
Journal ArticleDOI
The transport and function of silicon in plants.
TL;DR: A number of lines of evidence suggest the intrinsic PSi(OH)4 of about 10‐10 m s‐1 in the plant cell plasmalemma, while relatively low, could maintain the intracellular concentration of Si( OH)4 equal to that in the medium for a phytoplankton cell of 5 μm radius growing with a generation time of 24 h.
Journal ArticleDOI
Beneficial effects of plants in the remediation of soil and groundwater contaminated with organic materials
J. F. Shimp,John C. Tracy,Lawrence C. Davis,E. Lee,W. Huang,Larry E. Erickson,Jerald L. Schnoor +6 more
TL;DR: The use of plants in remediation of soil and unconfined groundwater contaminated with organic materials is appealing for a variety of reasons: plants provide a remediation strategy that utilizes solar energy; vegetation is aesthetically pleasing; plant samples can be harvested and tested as indicators of the level of remediation; plants help contain the region of contamination by removing water from soil; rhizosphere microbial communities are able to biodegrade a wide variety of organic contaminants; and many plants have mechanisms for transporting oxygen to the root zone as mentioned in this paper.
Journal ArticleDOI
Short- and long-distance transport of boric acid in plants.
TL;DR: The molecular weight and ether-water partition coefficient of boric acid are consistent with a PB(OH)3 in plant cell membranes of at least 10-6 cm s-1 as discussed by the authors.
Journal ArticleDOI
Uptake of organic chemicals by plants: A review of processes, correlations and models
TL;DR: A review of the mechanisms of uptake of organic chemical contaminants by plants from soil and the atmosphere is presented in this paper, from which it is concluded that the key chemical parameters are likely to be octanol water and octanol-air partition coefficients.
Journal ArticleDOI
Study of root uptake and xylem translocation of cinmethylin and related compounds in detopped soybean roots using a pressure chamber technique.
TL;DR: The relationship of root-to-shoot and phloem translocation was discussed to promote a better understanding at the whole plant level of the uptake and translocation of a soil-applied xenobiotic.