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    • Journal of Range Management, Volume 49 (1996)
    • Journal of Range Management, Volume 49, Number 3 (May 1996)
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    Environmental effects on picloram uptake and ethylene production by broom snakeweed

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    Author
    Sterling, T. M.
    Lownds, N. K.
    Murray, L. W.
    Issue Date
    1996-05-01
    Keywords
    uptake
    ethylene production
    efficacy
    night temperature
    ambient temperature
    Gutierrezia sarothrae
    equations
    rain
    picloram
    seasonal variation
    maturity stage
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    Citation
    Sterling, T. M., Lownds, N. K., & Murray, L. W. (1996). Environmental effects on picloram uptake and ethylene production by broom snakeweed. Journal of Range Management, 49(3), 245-250.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644248
    DOI
    10.2307/4002886
    Additional Links
    https://rangelands.org/
    Abstract
    Broom snakeweed [Gutierrezia sarothrae (Pursh) Britt. &Rusby] is a rangeland weed widely distributed in the western United States. Picloram (4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid) uptake and picloram-induced ethylene production by broom snakeweed grown in the field were determined every 2 to 4 weeks over 36 months. For each collection date, picloram uptake and concentration in the tissue ranged from 1.5 to 46.2% of applied and 0.2 to 4.7 nmol g-1 fresh wt, respectively. Of the measured environmental variables, average precipitation and average minimum temperature 7 days prior to treatment best predicted picloram uptake and concentration in the tissue, suggesting that warmer temperatures and precipitation previous to application contribute to picloram uptake. Average minimum temperature alone also provided a good predictor for picloram concentration in the tissue. For each collection date, picloram-induced ethylene production by total tissue ranged from 50 to 791% of control. Picloram-induced ethylene production by total tissue was best predicted by the precipitation and minimum temperature 7 days prior to treatment and picloram concentration in the tissue. Therefore, the amount of picloram absorbed and the environment prior to application both contribute to the physiological sensitivity of broom snakeweed to picloram. Picloram uptake and picloram-induced ethylene production were greatest in July and August, when plants were in the phenological stages of shoot regreening or flower bud emergence and when temperatures and precipitation were high. Previous field studies have shown broom snakeweed is most responsive to field picloram application in the post-bloom stage from October to December or in April and May with high moisture and soil temperature conditions; therefore, it appears that changes in uptake and physiological sensitivity as measured by picloram-induced ethylene production are not the only factors controlling differential sensitivity to picloram.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002886
    Scopus Count
    Collections
    Journal of Range Management, Volume 49, Number 3 (May 1996)

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