scholarly journals Sensing Plant Physiology and Environmental Stress by Automatically Tracking F j and F i Features in PSII Chlorophyll Fluorescence Induction

2019 ◽  
Vol 95 (6) ◽  
pp. 1495-1503 ◽  
Author(s):  
Qian Xia ◽  
Jinglu Tan ◽  
Shengyang Cheng ◽  
Yongnian Jiang ◽  
Ya Guo
Keyword(s):  
Plant Physiology ◽  
Chlorophyll Fluorescence ◽  
Environmental Stress ◽  
Fluorescence Induction ◽  
Chlorophyll Fluorescence Induction ◽  
Automatically Tracking

scholarly journals Sensing Plant Physiology and Environmental Stress by Automatically Tracking Fj and Fi Features in PSII Chlorophyll Fluorescence Induction

2018 ◽  
Author(s):  
Qian Xia ◽  
Jinglu Tan ◽  
Shengyang Cheng ◽  
Yongnian Jiang ◽  
Ya Guo
Keyword(s):  
Chlorophyll Fluorescence ◽  
Fixed Time ◽  
Fluorescence Induction ◽  
Chlorophyll Fluorescence Induction ◽  
Experimental Conditions ◽  
Redox States ◽  
Transition Points ◽  
Two Phases ◽  
Automatically Tracking ◽  
New Framework

AbstractFollowing a step excitation, chlorophyll fluorescence (ChlF) from photosystem II of a dark-adapted plant leaf exhibits the well-known OJIP pattern. The OJIP induction has been widely applied in plant science, agriculture engineering, and environmental engineering. While the J and I phases are related to transitions of photochemical reaction redox states, characteristic fluorescence intensities for the two phases (Fj and Fi) are often treated as fixed time points in routine measurement and thus do not account for variations in plant and experimental conditions, which (1) neglects the time differences, potentially useful information for characterizing plant status and environmental factors, and (2) leads to errors in measured Fj and Fi values. In this work, a method for consistent measurement of Fj and Fi was developed through polynomial fitting and curvature analysis. The method measures the curvatures in the OJIP curve and automatically tracks the characteristic transition points under variable sample and experimental conditions. Experiments were carried out to demonstrate the concept and classification capabilities of the developed method. This research established a new framework to analyze ChlF and enhanced the applications of ChlF.

Automatic identification of crop and weed species with chlorophyll fluorescence induction curves

2010 ◽  
Vol 12 (4) ◽  
pp. 546-563 ◽  
Author(s):  
Esa Tyystjärvi ◽  
Michael Nørremark ◽  
Heta Mattila ◽  
Mika Keränen ◽  
Marja Hakala-Yatkin ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Fluorescence Induction ◽  
Chlorophyll Fluorescence Induction ◽  
Automatic Identification ◽  
Weed Species

Drought resistance of hard wheat cultivars measured by a rapid chlorophyll fluorescence test

1985 ◽  
Vol 104 (3) ◽  
pp. 501-504 ◽  
Author(s):  
M. Havaux ◽  
R. Lannoye
Keyword(s):  
Chlorophyll Fluorescence ◽  
Fluorescence Induction ◽  
Chlorophyll Fluorescence Induction ◽  
Quenching Rate ◽  
Simple Method ◽  
Hard Wheat ◽  
Drought Tolerant ◽  
Resistant Varieties ◽  
Slow Fluorescence Induction

SummaryDisks of hard wheat (Triticum durum Desf.) leaves subjected to rapid desiccation over 4 h showed noticeable changes in the shape of the in vivo chlorophyll fluorescence induction curves. In drought-sensitive varieties (such as Claridoc), water stress resulted in a strong inhibition of the slow fluorescence induction transients. In particular, the fluorescence quenching rate was markedly decreased in water-stressed leaf disks. In contrast, leaves of drought-resistant varieties (such as Aouedj) showed only minor changes in chlorophyll fluorescence. The results of this investigation suggest that the slow transient of the in vivo chlorophyll fluorescence induction phenomenon may provide a simple method for selecting drought-tolerant wheats.

Differential Response of Two Soybean Cultivars to Paraquat

1993 ◽  
Vol 48 (3-4) ◽  
pp. 379-384 ◽  
Author(s):  
Sangho Kim ◽  
Kriton K. Hatzios
Keyword(s):  
Chlorophyll Fluorescence ◽  
Early Time ◽  
Fluorescence Induction ◽  
Chlorophyll Fluorescence Induction ◽  
Mesophyll Cells ◽  
Visible Injury ◽  
Soybean Cultivars ◽  
Wide Range ◽  
Time Periods ◽  
Reduced Mobility

The soybean cultivars “ Kwangkyo” and “ Hood ” are differentially sensitive to the bipyridylium herbicide paraquat (1,1′-dimethyl-4 ,4′-bipyridiniumion). This was confirmed by visible injury observations, measurements of desiccation levels and chlorophyll content, and tracings of chlorophyll fluorescence induction of fully expanded first trifoliate leaves of these two cultivars after exposure to a wide range of paraquat concentrations. The margin of this intraspecific differential tolerance to paraquat was narrow an d the ratio of the paraquat concentrations causing 50% injury to the tolerant Kwangkyo and to the susceptible Hood soybean (approximate tolerance factor) was found to be 10. Paraquat at 1 μᴍ or higher inhibited rapidly the CO2 fixation capacity of leaf mesophyll cells, isolated enzymatically from both cultivars. Thus, the tolerance of Kwangkyo soybean to paraquat does not appear to result from any differences at the site of paraquat action in chloroplast membranes. At early time periods (30 min to 2 h) after treatment with 100 μᴍ of paraquat, chlorophyll fluorescence induction was completely suppressed in first trifoliate leaves of Hood, but not in those of Kwangkyo soybean. At longer time periods (≧ 3 h), paraquat suppressed chlorophyll fluorescence induction similarly in leaves of both soybean cultivars. These results suggest that reduced mobility or a delayed release of paraquat in the mesophyll cells of Kwangkyo may be involved in the observed tolerance of this soybean cultivar to this herbicide.

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