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DIFFERENCES IN XYLEM EXUDATION BY SEMINAL ROOTS OF LOLIUM VARIETIES
Author(s) -
DUNLOP JAMES
Publication year - 1975
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1975.tb01334.x
Subject(s) - xylem , exudate , potassium , lolium , botany , biology , water transport , chromosomal translocation , transpiration , chemistry , agronomy , poaceae , water flow , photosynthesis , soil science , biochemistry , organic chemistry , gene , environmental science
Summary Exudation by excised roots of eleven Lolium varieties has been studied. Data on the rate of potassium translocation, the rate of water movement through the roots, the concentration of potassium in the xylem exudate, the electrical potential gradient across the roots, and the electrochemical potential difference for potassium across the roots is reported. Each parameter showed significant variation among the varieties with only water flux grouped according to species. It is suggested that the variation in rate of potassium translocation can be attributed partly to differences in the rate of water movement through roots and partly to differences in the intensity of transport to the xylem.