Uptake and phytotoxicity of the herbicide metsulfuron methyl in corn root tissue in the presence of the safener 1,8-naphthalic anhydride. [Zea mays L]

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Plant Physiology; (USA)

DOI:https://doi.org/10.1104/pp.93.2.730· OSTI ID:5957305

Milhomme, H; Bastide, J ^[1]

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1. Universite de Periphignan (France)

Growth of Zea mays L. cv Potro roots was inhibited by the herbicide metsulfuron methyl (MSM) at the lowest concentration tested: 5 nanomoles per liter. Pretreatment of corn seeds with commercial 1,8-naphthalic anhydride (NA) at 1% (w/w) partially reversed MSM-induced root growth inhibition. MSM at a concentration of 52 nanomoles per liter was taken up rapidly by roots and accumulated in the corn tissue to concentrations three times those in the external medium; the safener NA increased MSM uptake up to 48 hours. The protective effect of NA was related to the ability of the safener to increase the metabolism of MSM; ten-fold increases in the metabolic rates of MSM were observed in NA-pretreated corn seedlings grown for 48 hours on 52 nanomolar ({sup 14}C)MSM solution. DNA synthesis determined by measurement of ({sup 3}H)thymidine incorporation into DNA was inhibited by root MSM applications; after a 6-hour application period, 13 nanomolar MSM solution reduced DNA synthesis by 64%, and the same reduction was also observed with NA-treated seedlings. Pretreatment of corn seeds with safener NA did not increase the acetolactate synthase activity in the roots and did not change, up to 13 micromoles per liter, the in vitro sensitivity of roots to MSM.

• OSTI ID: 5957305
• Journal Information: Plant Physiology; (USA), Journal Name: Plant Physiology; (USA) Vol. 93:2; ISSN 0032-0889; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

553002* -- Agriculture & Food Technology-- Horticulture-- (1987-)
60 APPLIED LIFE SCIENCES
ANHYDRIDES
AZINES
BIOLOGICAL EFFECTS
BODY
CARBON 14 COMPOUNDS
CARBOXYLIC ACIDS
CEREALS
DICARBOXYLIC ACIDS
DNA REPLICATION
ENZYME ACTIVITY
GRASS
GROWTH
HERBICIDES
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
INHIBITION
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
LILIOPSIDA
MAGNOLIOPHYTA
MAIZE
METABOLISM
NUCLEIC ACID REPLICATION
NUCLEOSIDES
NUCLEOTIDES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PESTICIDES
PHTHALIC ACID
PLANT GROWTH
PLANT TISSUES
PLANTS
PYRIMIDINES
RIBOSIDES
ROOTS
SEEDLINGS
THYMIDINE
TISSUES
TOXICITY
TRACER TECHNIQUES
TRITIUM COMPOUNDS
UPTAKE