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The Action of Duramycin on Plant Roots
Author(s) -
Norman A. G.
Publication year - 1960
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/sssaj1960.03615995002400020013x
Subject(s) - hypocotyl , elongation , biology , auxin , plant defense against herbivory , microbiology and biotechnology , chemistry , botany , antibiotics , calcium , biochemistry , materials science , organic chemistry , gene , metallurgy , ultimate tensile strength
The polypeptide antibiotic, duramycin, has been reported to be antagonistic to certain plant pathogens. Growth of plant roots, however, is repressed by this compound. The duramycin concentration causing 50% reduction in elongation of the primary root of cucumber is 42 µg. per ml. The deleterious effect is mitigated or prevented by simultaneous presentation of calcium or magnesium ions. Depending on concentration, duramycin resembles polymyxin in being bound to plant roots. Roots exposed to excess duramycin lose solutes, both inorganic and organic, and are irreversibly injured. Auxin‐induced water uptake by hypocotyl segments is unaffected by low concentrations of duramycin which does not have antiauxin properties.