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Copper Accumulation in Citrus Roots and Desorption with Acid
Author(s) -
Brams E. A.,
Fiskell J. G. A.
Publication year - 1971
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1971.03615995003500050039x
Subject(s) - endodermis , chemistry , xylem , copper , elongation , orange (colour) , botany , nuclear chemistry , biology , materials science , food science , organic chemistry , metallurgy , ultimate tensile strength
Root accumulation of 04 Cu from labelled Cu(NO 3 ) 2 in intact ‘Mandarin Orange’ ( Citrus reticulata ) seedlings had a constant rate for the first 15 min and then became curvilinear for periods from 15 to 180 min, when the ambient solution contained 0.6 ppm Cu. Over a 60‐min contact time uptake of Cu was linear for ambient Cu concentration range from 0.3 to 1.2 ppm. Extraction of 64 Cu in roots by 0.1 N HCl was linearly proportional to total root Cu and was 95% complete after 28 min. Colloidal phosphate reduced 64 Cu accumulation in the roots by 12%. In roots of ‘Sour Orange’ ( C. aurantium ) seedlings grown in solution culture and in groves Cu was located in thin sections by ferrocyanide staining. Concentration of Cu occurred in the exodermis, endodermis, and pericycle cells. Electromicrographs of citrus roots suffering from Cu toxicity showed irregular deformation of cell walls in xylem vessels. In such cases roots became club shaped as root elongation ceased. Reactions of Cu with protein are suggested as mechanisms for Cu accumulation in roots.