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THE ACCUMULATION OF 65 ZN BY ROOT HOMOGENATES OF ZINC‐TOLERANT AND NON‐TOLERANT CLONES OF AGROSTIS TENUIS SIBTH.
Author(s) -
TURNER R. G.,
MARSHALL C.
Publication year - 1971
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.1469-8137.1971.tb02555.x
Subject(s) - agrostis , zinc , biology , botany , clone (java method) , chemistry , poaceae , biochemistry , gene , organic chemistry
S ummary The localization of 65 Zn was examined in cell‐free systems extracted from the roots of clones of Agrostis tenuis in further investigations on the mechanism of heavy metal tolerance in this grass species. The cell wall fraction was a major site for zinc accumulation especially in a zinc‐tolerant clone where more zinc accumulated at this site than in non‐zinc‐tolerant clones. In the absence of the cell wall fraction or when its zinc‐binding potential had been reduced, other particulate cellular components accumulated large amounts of zinc. Zinc uptake by the cell wall occurred by the same process in all the clones studied. Uptake was very rapid and independent of temperature and pH, suggesting an exchange adsorption process. A basis for zinc tolerance in A. tenuis is briefly discussed.