Invivo chlorophyll fluorescence as a possible indicator of the dormancy stage in Douglas-fir seedlings

1985 ◽  
Vol 15 (4) ◽  
pp. 607-612 ◽  
Author(s):  
C. D. B. Hawkins ◽  
G. R. Lister
Keyword(s):  
Chlorophyll Fluorescence ◽  
Photosynthetic Pigment ◽  
Maximum Growth ◽  
Relative Increase ◽  
Douglas Fir ◽  
Fluorescence Induction ◽  
Chlorophyll B ◽  
Total Chlorophyll ◽  
Fluorescence Parameters ◽  
Pigment Contents

Invivo chlorophyll fluorescence and photosynthetic pigment contents of current-year needles from five populations of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco, var. menziesii Franco and var. glauca (Beissn.) Franco) were monitored at 3- to 4-week intervals over 2 years. The results were compared with the reported stage of seedling dormancy to ascertain whether this technique would be suitable for indicating dormancy status. Minimum values of fluorescence-induction parameters, indicating winter photosynthetic inactivation, were observed during the coldest period. The lower the temperature and the greater the irradiance, the greater the apparent inactivation. An increase in chlorophyll a to chlorophyll b ratios and a decrease in total chlorophyll to carotenoid ratios, indicating a relative increase in protective carotene pigments, was associated with this period. Maximum values for the fluorescence parameters were observed during periods of maximum growth. It appears that a rapid and inexpensive means of screening for Douglas-fir's dormancy status could be developed using invivo chlorophyll fluorescence analyses.

scholarly journals The effect of UV-B radiation on the chlorophyll fluorescence parameters of the husked and the naked oat

2013 ◽  
Vol 52 (1-2) ◽  
pp. 149-152 ◽  
Author(s):  
Elżbieta Skórska
Keyword(s):  
Chlorophyll Fluorescence ◽  
Fluorescence Induction ◽  
Chlorophyll Fluorescence Induction ◽  
Short Term ◽  
Chlorophyll Fluorescence Parameters ◽  
Naked Oat ◽  
Fluorescence Parameters ◽  
Traditional Variety

Naked oat variety of STH296 showed higher tolerance than traditional variety Bajka on short-term UV-B radiation (UV-B<sub>BE</sub>=1 1 kJ·m<sup>-2</sup>) on the stage of primary photosynthesis reaction recorded using chlorophyll fluorescence induction of the leaves.

scholarly journals Laser-induced chlorophyll fluorescence and reflectance spectroscopy of cadmium treatedTriticum aestivumL. plants

2011 ◽  
Vol 26 (2) ◽  
pp. 129-139 ◽  
Author(s):  
Jitendra Kumar Pandey ◽  
R. Gopal
Keyword(s):  
Chlorophyll Fluorescence ◽  
Plant Growth ◽  
Diode Laser ◽  
Vegetation Index ◽  
Growth Parameters ◽  
Photosynthetic Pigment ◽  
Fluorescence Induction ◽  
Reflectance Spectra ◽  
Integrating Sphere ◽  
Induction Kinetics

The present study deals with laser-induced chlorophyll fluorescence (LICF) spectra, reflectance spectra and fluorescence induction kinetics (FIK) curves ofTriticum aestivumL. plants treated with different concentrations of cadmium (0.01, 0.1 and 1.0 mM). LICF spectra were recorded in the region of 650–780 nm using violet diode laser (405 nm) and FIK curves were recorded at 685 and 730 nm using red diode laser (635 nm) for excitation. Reflectance spectra were recorded in the region of 400–800 nm using spectrophotometer with an integrating sphere. The fluorescence intensity ratios (FIR) were determined from LICF spectra, vitality index (Rfd) from FIK curves and narrow band vegetation index (NBVI) from reflectance spectra. These parameters along with plant growth parameters and photosynthetic pigment contents were used to analyze the effect of cadmium on wheat plants. The results clearly show that lower concentration of Cd (0.01 mM) shows stimulatory response; whereas higher concentrations (0.1 and 1.0 Mm) are hazardous for plant growth, photosynthetic pigments and photosynthetic activity of wheat plants.

scholarly journals Chlorophyll Fluorescence - a Tool for Quick Identification of Accase and ALS Inhibitor Herbicides Performance

2019 ◽  
Vol 37 ◽  
Author(s):  
M. KARGAR ◽  
R. GHORBANI ◽  
M.H. RASHED MOHASSEL ◽  
M. RASTGOO
Keyword(s):  
Chlorophyll Fluorescence ◽  
Quantum Efficiency ◽  
Fluorescence Induction ◽  
Wild Oat ◽  
Weed Species ◽  
Fluorescence Parameters ◽  
Induction Curve ◽  
Als Inhibitor ◽  
Kautsky Curve ◽  
Maximum Quantum Efficiency

ABSTRACT: Chlorophyll fluorescence measurement is a precise research technique that can be used for studying the effect of herbicides with different modes of action on photosynthetic apparatus. The aim of the present project was to study the variation of the fluorescence induction curve (Kautsky curve) and its variables affected by pinoxaden (ACCase inhibitor) and mesosulfuron-methyl + iodosulfuron herbicide (ALS inhibitor) in littleseed canarygrass (Phalaris minor Retz.) and wild oat (Avena ludoviciana Durieu). This study was carried out at the Greenhouse of Collage of Agriculture at Ferdowsi University of Mashhad, during 2013. Experiments were performed based on a completely randomized design in form of a dose-response test with six doses of each herbicide plus an untreated control. The maximum quantum efficiency of photosystem II (PSII) was measured 1, 2, 3, 5 and 7 days after spraying (DAS). The results obtained in the study indicated that the estimated EDs parameters differed based on herbicide types or weed species. For example, ED90 varied from 11.67 to 28.61 g active ingredient (a.i.) ha-1. Moreover, the results showed that application of mesosulfuron-methyl + iodosulfuron at doses higher than 9 g a.i. ha-1 changed the shape of the chlorophyll fluorescence induction curve (Kautsky curve) in littleseed canarygrass at 7 DAS while herbicide doses of mesosulfuron-methyl + iodosulfuron did not change the shape of the Kautsky curve in wild oat. In addition, the Kautsky curve was observed to have an approximate permanent drop for littleseed canarygrass species at 2 DAS by pinoxaden. Comparing the fluorescence parameters in wild oat and littleseed canarygrass treated with two herbicides showed that Fv/Fm, the maximum quantum efficiency of PSII and Fvj, variable fluorescence at the J step of littleseed canarygrass decreased more than the mentioned parameters in wild oat. Furthermore, there was a strong relationship ranging from 0.53 to 0.79 between dry weights after 4 weeks and fluorescence parameters at 7 DAS depending on the herbicide type and weed species. Applying fluorescence parameters a few days after treatment to predict biomass production can be a defining criterion in research and development stages of herbicides to eliminate the need for whole plant bioassay. This method can also be applied to shorten the bioassay screening period and function as a suitable and cost effective indicator for monitoring of ACCase and ALS inhibitors. This approach also demonstrates serious damages to plant photosynthesis apparatus on crop during herbicide misapplication.

Sites of Herbicidal Action on Photosynthesis: A Fluorescence Assay Study

Weed Science ◽  
1981 ◽  
Vol 29 (4) ◽  
pp. 371-375 ◽  
Author(s):  
H. Böhme ◽  
K. J. Kunert ◽  
P. Böger
Keyword(s):  
Chlorophyll Fluorescence ◽  
Membrane Lipids ◽  
Diphenyl Ether ◽  
Algal Growth ◽  
Fluorescence Induction ◽  
Rapid Screening ◽  
Diphenyl Ethers ◽  
Total Fluorescence ◽  
Transport Inhibitors ◽  
Weak Electron

The effect of the bleaching and non-bleaching phenylpyridazinones, norflurazon [4-chloro-5-(methylamino)-2-(α,α,α-trifluoro-m-tolyl)-3(2H)-pyridazinone] and BAS 29095 [4,5-dimethoxy-2-phenyl-3(2H)-pyridazinone], on chlorophyll fluorescence of the green alga,Scenedesmus acutus, was investigated and compared to other bleaching herbicides, difunon3[EMD-IT 5914, 5(dimethylamino-methylene)-2-oxo-4-phenyl-2,5-dihydrofuranecarbonitrile-(3)] and the diphenyl ether, oxyfluorfen [2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl)benzene]. Following chlorophyll fluorescence during short-term cultivation in the presence of herbicides and comparing it to physiological parameters such as chlorophyll content and packed cell volume allowed for rapid screening to detect different primary herbicidal modes of action. Two primary bleaching effects caused by either inhibition of carotene biosynthesis (certain substituted pyridazinones and difunon) or peroxidative degradation of membrane lipids (certain diphenyl ethers) led to completely different fluorescence signals. Growth of algae in the presence of a carotene biosynthesis inhibitor resulted in a rapid rise to maximum fluorescence, followed by a single decay phase, whereas bleaching diphenyl ethers led to a rapid loss of total fluorescence. Non-bleaching phenylpyridazinones, which act as weak electron transport inhibitors, inhibited variable fluorescence. Detoxication during algal growth became evident by recovery of the fluorescence induction.

Photoinduced toxicity of fluoranthene on primary processes of photosynthesis in lichens

2006 ◽  
Vol 39 (1) ◽  
pp. 91-100 ◽  
Author(s):  
Marie KUMMEROVÁ ◽  
štěpán ZEZULKA ◽  
Jana KRULOVÁ ◽  
Jan TŘÍSKA
Keyword(s):  
Chlorophyll Fluorescence ◽  
Bioconcentration Factor ◽  
Lichen Species ◽  
Chlorophyll Fluorescence Parameters ◽  
Fluorescence Parameters ◽  
Photochemical Processes ◽  
Symbiotic Algae ◽  
Lasallia Pustulata ◽  
Photoinduced Toxicity ◽  
Umbilicaria Hirsuta

The effect of increasing concentrations (0·01, 0·1, 1 and 5 mg l−1) of intact (FLT) and photo-modified (phFLT) fluoranthene and the duration of exposure (1, 2, 3, 5 and 7 days) on the chlorophyll fluorescence parameters (F0, FV/FM, and ΦII) of symbiotic algae in the thalli of two foliose lichens Lasallia pustulata and Umbilicaria hirsuta was investigated. In addition the FLT concentration in thalli of both lichen species was determined and a bioconcentration factor (BCF) was calculated. The results obtained demonstrated that the concentrations of FLT and especially phFLT (1 and 5 mg l−1) applied affected primary photochemical processes of photosynthesis in the algae of both lichen species. The F0 value increased and the FV/FM and ΦII values decreased. The fluoranthene content in the thallus of both lichen species increased with increasing FLT concentration in the environment.

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.

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