The Relationship between Chlorophyll Fluorescence Parameter (Fv/Fm) and Frequency Component of Plant Bioelectric Potential in Spraying Chemical Herbicides

2012 ◽  
Vol 132 (6) ◽  
pp. 154-158
Author(s):  
Shin-ichi Shibata ◽  
Fumitake Satou ◽  
Haruhiko Kimura ◽  
Takashi Oyabu
Keyword(s):  
Chlorophyll Fluorescence ◽  
Frequency Component ◽  
Bioelectric Potential ◽  
Chlorophyll Fluorescence Parameter ◽  
Fluorescence Parameter ◽  
The Relationship

scholarly journals Chlorophyll Fluorescence Parameters and Antioxidant Defense System Can Display Salt Tolerance of Salt Acclimated Sweet Pepper Plants Treated with Chitosan and Plant Growth Promoting Rhizobacteria

Agronomy ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1180 ◽  
Author(s):  
Muneera D. F. ALKahtani ◽  
Kotb A. Attia ◽  
Yaser M. Hafez ◽  
Naeem Khan ◽  
Ahmed M. Eid ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Plant Growth ◽  
Plant Growth Promoting Rhizobacteria ◽  
Sweet Pepper ◽  
Fruit Yield ◽  
Chlorophyll Fluorescence Parameter ◽  
Fluorescence Parameter ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Pepper Plants

Salinity stress deleteriously affects the growth and yield of many plants. Plant growth promoting rhizobacteria (PGPR) and chitosan both play an important role in combating salinity stress and improving plant growth under adverse environmental conditions. The present study aimed to evaluate the impacts of PGPR and chitosan on the growth of sweet pepper plant grown under different salinity regimes. For this purpose, two pot experiments were conducted in 2019 and 2020 to evaluate the role of PGPR (Bacillus thuringiensis MH161336 106–8 CFU/cm3) applied as seed treatment and foliar application of chitosan (30 mg dm−3) on sweet pepper plants (cv. Yolo Wonder) under two salinity concentrations (34 and 68 mM). Our findings revealed that, the chlorophyll fluorescence parameter (Fv/Fm ratio), chlorophyll a and b concentrations, relative water content (RWC), and fruit yield characters were negatively affected and significantly reduced under salinity conditions. The higher concentration was more harmful. Nevertheless, electrolyte leakage, lipid peroxidation, hydrogen peroxide (H2O2), and superoxide (O2−) significantly increased in stressed plants. However, the application of B. thuringiensis and chitosan led to improved plant growth and resulted in a significant increase in RWC, chlorophyll content, chlorophyll fluorescence parameter (Fv/Fm ratio), and fruit yield. Conversely, lipid peroxidation, electrolyte leakage, O2−, and H2O2 were significantly reduced in stressed plants. Also, B. thuringiensis and chitosan application regulated the proline accumulation and enzyme activity, as well as increased the number of fruit plant−1, fruit fresh weight plant−1, and total fruit yield of sweet pepper grown under saline conditions.

Chlorophyll fluorescence screening of Arabidopsis thaliana for CO2 sensitive photorespiration and photoinhibition mutants

2009 ◽  
Vol 36 (11) ◽  
pp. 867 ◽  
Author(s):  
Murray R. Badger ◽  
Hossein Fallahi ◽  
Sarah Kaines ◽  
Shunichi Takahashi
Keyword(s):  
Arabidopsis Thaliana ◽  
Chlorophyll Fluorescence ◽  
Fluorescence Imaging ◽  
High Throughput ◽  
Rapid Decline ◽  
Arabidopsis Mutants ◽  
High Co2 ◽  
Chlorophyll Fluorescence Parameter ◽  
Low Co2 ◽  
Fluorescence Parameter

Exposure of Arabidopsis thaliana (L.) photorespiration mutants to air leads to a rapid decline in the Fv/Fm chlorophyll fluorescence parameter, reflecting a decline in PSII function and an onset of photoinhibition. This paper demonstrates that chlorophyll fluorescence imaging of Fv/Fm can be used as an easy and efficient means of detecting Arabidopsis mutants that are impaired in various aspects of photorespiration. This screen was developed to be sensitive and high throughput by the use of exposure to zero CO2 conditions and the use of array grids of 1-week-old Arabidopsis seedlings as the starting material for imaging. Using this procedure, we screened ~25 000 chemically mutagenised M2 Arabidopsis seeds and recovered photorespiration phenotypes (reduction in Fv/Fm at low CO2) at a frequency of ~4 per 1000 seeds. In addition, we also recovered mutants that showed reduced Fv/Fm at high CO2. Of this group, we detected a novel ‘reverse photorespiration’ phenotype that showed a high CO2 dependent reduction in Fv/Fm. This chlorophyll fluorescence screening technique promises to reveal novel mutants associated with photorespiration and photoinhibition.

scholarly journals Behavior of Sethoxydim Alone or in Combination with Turnip Oils on Chlorophyll Fluorescence Parameter

2014 ◽  
Vol 6 (1) ◽  
pp. 112-118
Author(s):  
Hossein HAMMAMI ◽  
Mohammad Hassan RASHED MOHASSEL ◽  
Mehdi PARSA ◽  
Mohammad BANNAYAN-AVAL ◽  
Eskandar ZAND
Keyword(s):  
Chlorophyll Fluorescence ◽  
Dose Response ◽  
Dry Weight ◽  
Fluorescence Method ◽  
Screening Methods ◽  
College Of Agriculture ◽  
Chlorophyll Fluorescence Parameter ◽  
Fluorescence Parameter ◽  
Good Relation ◽  
Kautsky Curve

Sethoxydim is an acetyl-coenzyme A carboxylase (ACCase) inhibitor that changed the shape of the chlorophyll fluorescence curve (kautsky curve) in wild oat (Avena ludoviciana Durieu.) in greenhouse experiment. This experiment was conducted as completely randomized factorial design with three replications at the College of Agriculture, Ferdowsi University of Mashhad, Iran, during 2012. Results of this study revealed that sethoxydim only and plus emulsifiable turnip oil changed the shape of the chlorophyll fluorescence curve (kautsky curve) 7 days after spraying. Sethoxydim plus emulsifiable turnip oil changed the shape of the kautsky curve more than for sethoxydim only. We found that in our study the fv/fm (maximum quantum efficiency) was closely linked to the fresh and dry weight dose-response. Sethoxydim plus emulsifiable turnip oil proved more rapidly effect on fv/fm in comparison with sethoxydim only. The fresh and dry weight dose-response relationship with fv/fm showed a similar behavior. This study revealed a good relation between fresh and dry weight according with values of 28 DAS and fv/fm 7 DAS. In general, the findings of this study revealed that Fv/Fm is a good parameter for evaluating effect of sethoxydim little time after spraying. Also, this research showed that 4 folds more time for classical screening methods comparing to chlorophyll fluorescence method. Thereupon, classical screening methods may be replaced by chlorophyll fluorescence method in future.

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