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Evaluation of Chlorophyll Fluorescence Parameters for an Intact‐Plant Herbicide Bioassay 1
Author(s) -
Shaw D. R.,
Peeper T. F.,
Nofziger D. L.
Publication year - 1986
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1986.0011183x002600040027x
Subject(s) - metribuzin , avena , atrazine , biology , transplanting , chlorophyll fluorescence , bioassay , fluorescence , photosynthesis , phytotoxicity , alachlor , inflection point , chlorophyll , botany , zoology , horticulture , pesticide , agronomy , weed control , seedling , ecology , physics , geometry , mathematics , quantum mechanics
The correlations between various chlorophyll fluorescence induction curve parameters and metribuzin [4‐Amino‐6‐(1,1‐dimethyl‐ethyl)‐3‐(methylthio)‐1,2,4‐triazin‐5(4/ H )‐one], diuron [3‐(3,4‐Dichlorophenyl)‐1,1‐dimethylurea], and atrazine (2‐chloro‐4‐ethylamino‐6‐ isopropylamino‐S‐triazine) concentrations were compared in laboratory studies. The ratio of the initial inflection point (I) to the initial peak (P) was the most precise indicator of photosynthetic inhibition over time intervals of 4 to 48 h after an oat ( Avena sativa L. ‘Chilocco’) plant was transplanted into herbicide‐treated soil. The height of the initial inflection point (I), the peak level (P), and the fluorescence level 30 s after the onset of illumination (T) were also useful at 4 and 8 h after transplanting, but correlated poorly with herbicide concentration at later time intervals. Other variables examined included the slopes from I to P and P to S, the percent decay from P to T, and the complementary area. These parameters did not correlate to herbicide concentration as well, and had a much higher degree of variability associated with them.