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Morphophysiological traits and atrazine sensitivity in Chenopodium album L.
Author(s) -
Pavlovic Danijela,
Vrbnicanin Sava,
Bozic Dragana,
Fischer Albert J
Publication year - 2008
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.1473
Subject(s) - atrazine , chenopodium , shoot , weed , chlorophyll fluorescence , horticulture , biology , chlorophyll , agronomy , botany , pesticide , zoology
BACKGROUND: A Chenopodium album L. biotype surviving in atrazine‐treated Serbian corn fields (VC) was compared against atrazine‐susceptible (S) and atrazine‐resistant (R) standards. RESULTS: Atrazine (2 kg ha −1 ) killed S and VC shoot biomass 15 days after treatment (DAT), but R was only suppressed by 42% and survived 8 kg ha −1 . Atrazine at 2 kg ha −1 only inhibited VC height by 60% as against 100 and 0% for S and R respectively. Chlorophyll fluorescence ( Fv/Fm ) and transpiration were insensitive to atrazine in R, but were inhibited by 90 and 100% in S and by 50 and 60% in VC respectively. Decline of Fv/Fm after 2 kg ha −1 atrazine was stabilized at 3 DAT for the VC biotype. CONCLUSION: A toxicity mitigation mechanism could have facilitated VC survival in an atrazine‐treated field. Further knowledge on this mechanism is needed to establish if surviving VC plants are indicators of atrazine resistance evolution in these Serbian corn fields. Variables related to foliar function provided better detection of weed mechanisms to survive herbicide action than the usual shoot biomass measurements. Copyright © 2007 Society of Chemical Industry