Electrochemical quantification of chlorpyrifos in white (Allium cepa L.) and green (Allium fistulosum L.) onions Cuantificación voltamétrica de clorpirifos en cebolla de bulbo (Allium cepa L.) y cebolla de rama (Allium fistulosum L.)

The Linear sweep voltammetry method (LSP) of a common pesticide such as chlorpyrifos (CP) an organophosphate pesticide (OPP) in white (Allium cepa L.) and green onions (Allium fistulosum L.) was investigated. A hanging mercury drop electrode (HMDE) Ag/AgCl was used as reference electrode and platinum as a counter electrode. The OPP was extracted from the onion through liquid-liquid partition using acetone/dichloromethane as the solvent. Validated method was compared with GC/ECD as a reference method. CP concentration was not different between the two analytical techniques; the analysis was performed with a confidence level of 90%, corresponding to the polarographic method. CP concentration was 0.8400 ± 0.062 ppm in Allium cepa and 0.062 ± 0.300 ppm in Allium fistulosum L. These values exceed the ADI and ARD values for chlorpyrifos established by current regulations.

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The cathodic reduction of PbO in the passive layer on lead in aqueous sulphuric acid

Canadian Journal of Chemistry ◽

10.1139/v84-100 ◽

1984 ◽

Vol 62 (3) ◽

pp. 596-600 ◽

Cited By ~ 17

Author(s):

R. G. Barradas ◽

D. S. Nadezhdin

Keyword(s):

Experimental Data ◽

Three Dimensional ◽

Reference Electrode ◽

Linear Sweep Voltammetry ◽

Passive Layer ◽

Cathodic Reduction ◽

Linear Sweep ◽

Current Time ◽

Lead Monoxide ◽

Two Peaks

The cathodic reduction of the lead monoxide layer formed on lead in 30% aqueous H2SO4 under anodic oxidation at 0.6 V (vs. Hg/HgSO4 reference electrode) was investigated by linear sweep voltammetry, potential step and admittance measurements. The experimental data were analyzed respectively in terms of thin-layer electrochemistry, electrocrystallisation, and changes of resistance of the PbO layer under reduction. The results seem to be best interpreted from the theory of three-dimensional electrocrystallisation as PbO is reduced to Pb. At sub-zero temperatures the PbO peak observed on our voltammograms and potentiostatic current time transients reveals the splitting of the curves into two peaks, which may be a result of reduction of the same material but of different phases, namely, orthorhombic and tetragonal PbO.

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Allium cepa L. Allium fistulosum L. Allium ramosum L. Allium sativum L. Amaryllidaceae

Ethnobotany of Mountain Regions ◽

10.1007/978-3-030-28933-1_15 ◽

2020 ◽

pp. 159-169

Author(s):

Narel Y. Paniagua-Zambrana ◽

Rainer W. Bussmann ◽

Carolina Romero

Keyword(s):

Allium Cepa ◽

Allium Sativum ◽

Allium Fistulosum ◽

Allium Cepa L

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Screening and incorporation of rust resistance from Allium cepa into bunching onion (Allium fistulosum) via alien chromosome addition

Genome ◽

10.1139/gen-2015-0026 ◽

2015 ◽

Vol 58 (4) ◽

pp. 135-142 ◽

Cited By ~ 2

Author(s):

Tadayuki Wako ◽

Ken-ichiro Yamashita ◽

Hikaru Tsukazaki ◽

Takayoshi Ohara ◽

Akio Kojima ◽

...

Keyword(s):

Allium Cepa ◽

Rust Resistance ◽

Rust Fungus ◽

Allium Fistulosum ◽

Addition Line ◽

Chromosome Addition ◽

Allium Cepa L ◽

Alien Chromosome Addition ◽

High Level ◽

Bunching Onion

Bunching onion (Allium fistulosum L.; 2n = 16), bulb onion (Allium cepa L. Common onion group), and shallot (Allium cepa L. Aggregatum group) cultivars were inoculated with rust fungus, Puccinia allii, isolated from bunching onion. Bulb onions and shallots are highly resistant to rust, suggesting they would serve as useful resources for breeding rust resistant bunching onions. To identify the A. cepa chromosome(s) related to rust resistance, a complete set of eight A. fistulosum – shallot monosomic alien addition lines (MAALs) were inoculated with P. allii. At the seedling stage, FF+1A showed a high level of resistance in controlled-environment experiments, suggesting that the genes related to rust resistance could be located on shallot chromosome 1A. While MAAL, multi-chromosome addition line, and hypoallotriploid adult plants did not exhibit strong resistance to rust. In contrast to the high resistance of shallot, the addition line FF+1A+5A showed reproducibly high levels of rust resistance.

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Allium cepa L. Allium fistulosum L. Allium ramosum L. Allium sativum L. Amaryllidaceae

Ethnobotany of Mountain Regions - Ethnobotany of the Andes ◽

10.1007/978-3-319-77093-2_15-1 ◽

2020 ◽

pp. 1-11 ◽

Cited By ~ 1

Author(s):

Narel Y. Paniagua-Zambrana ◽

Rainer W. Bussmann ◽

Carolina Romero

Keyword(s):

Allium Cepa ◽

Allium Sativum ◽

Allium Fistulosum ◽

Allium Cepa L

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Cytological Evaluations of Advanced Generations of Interspecific Hybrids Between Allium cepa and Allium fistulosum Showing Resistance to Stemphylium vesicarium

Genes ◽

10.3390/genes10030195 ◽

2019 ◽

Vol 10 (3) ◽

pp. 195 ◽

Cited By ~ 2

Author(s):

Natalia Kudryavtseva ◽

Michael J. Havey ◽

Lowell Black ◽

Peter Hanson ◽

Pavel Sokolov ◽

...

Keyword(s):

Allium Cepa ◽

Interspecific Hybrids ◽

Molecular Classification ◽

Allium Fistulosum ◽

Bulb Onion ◽

Allium Cepa L ◽

Disease Resistances ◽

Interspecific Crossing

Interspecific crossing is a promising approach for introgression of valuable traits to develop cultivars with improved characteristics. Allium fistulosum L. possesses numerous pest resistances that are lacking in the bulb onion (Allium cepa L.), including resistance to Stemphylium leaf blight (SLB). Advanced generations were produced by selfing and backcrossing to bulb onions of interspecific hybrids between A. cepa and A. fistulosum that showed resistance to SLB. Molecular classification of the cytoplasm established that all generations possessed normal (N) male−fertile cytoplasm of bulb onions. Genomic in situ hybridization (GISH) was used to study the chromosomal composition of the advanced generations and showed that most plants were allotetraploids possessing the complete diploid sets of both parental species. Because artificial doubling of chromosomes of the interspecific hybrids was not used, spontaneous polyploidization likely resulted from restitution gametes or somatic doubling. Recombinant chromosomes between A. cepa and A. fistulosum were identified, revealing that introgression of disease resistances to bulb onion should be possible.

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Introgression of Allium fistulosum L. into Allium cepa L.: cytogenetic evidence

Theoretical and Applied Genetics ◽

10.1007/bf00223796 ◽

1990 ◽

Vol 79 (1) ◽

pp. 113-118 ◽

Cited By ~ 19

Author(s):

E. B. Peffley ◽

P. D. Mangum

Keyword(s):

Allium Cepa ◽

Allium Fistulosum ◽

Allium Cepa L ◽

Cytogenetic Evidence

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Thrips (Thysanoptera) associated with onion (Allium cepa L.) and Welsh onion (Allium fistulosum L.)

Folia Horticulturae ◽

10.2478/fhort-2020-0028 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Marta Olczyk ◽

Maria Pobożniak

Keyword(s):

Allium Cepa ◽

Growing Season ◽

Thrips Tabaci ◽

Allium Fistulosum ◽

Onion Thrips ◽

Welsh Onion ◽

Allium Cepa L ◽

Onion Cultivar ◽

The Relationship ◽

Thrips Population

AbstractWe determined the abundance, species composition, sex ratio and seasonal dynamics of thrips on one cultivar of Welsh onion (Allium fistulosum) and eight cultivars of onion (Allium cepa) in South Poland within three vegetation seasons (2014–2016). Nine species of Thysanoptera were identified on A. cepa and A. fistulosum. Irrespective of the onion cultivar, Thrips tabaci was the dominant species (64.4% of all collected thrips specimens), while Frankliniella intonsa also occurred in high numbers (28.3%). Conversely, Welsh onion was most often inhabited by F. intonsa (62.7%), although T. tabaci was also numerous (28.3%). The predatory Aeolothrips intermedius accounted for 4.5% on A. cepa and 2.9% on A. fistulosum. In the most numerous species, T. tabaci, F. intonsa and A. intermedius populations were formed mainly by females. The cultivar most colonised by thrips was Kroll of A. fistulosum. The tested cultivars of A. cepa demonstrated varying degrees of attractiveness to thrips in the subsequent years. The relationship between populations of T. tabaci, F. intonsa and A. intermedius changed in the subsequent months of the growing season. In June, mainly T. tabaci and F. intonsa occurred on onion plants, while from July, the percentage shares of F. intonsa and the predatory A. intermedius in the thrips population on many onion cultivars increased. The level of attractiveness of A. cepa related to onion thrips, which is reported as a main pest of onion, varies depending on the year and cultivar.

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The voltammetric determination of Mo in seawater after adsorptive accumulation of the Eriochrome Blue Black R complex

Canadian Journal of Chemistry ◽

10.1139/v87-162 ◽

1987 ◽

Vol 65 (5) ◽

pp. 957-960 ◽

Cited By ~ 16

Author(s):

S. N. Willie ◽

S. S. Berman ◽

J. A. Page ◽

G. W. VanLoon

Keyword(s):

Limit Of Detection ◽

Reference Electrode ◽

Direct Determination ◽

Linear Sweep Voltammetry ◽

Linear Sweep ◽

Negative Direction ◽

Seawater Samples ◽

Certified Values ◽

A Current

A method for direct determination of molybdenum in seawater has been developed, and uses linear sweep voltammetry after adsorptive accumulation of the Erichrome Blue Black R (EBBR) complex on a static mercury drop electrode. To an acidified (pH 1.6) seawater (SW) sample, 6.0 × 10−6 M EBBR is added and preconcentration by adsorption is carried out for 30 s at a potential of −0.05 V vs. the Ag/AgCl/SW reference electrode. The potential is then scanned in the negative direction, giving a current peak for the reduction of the Mo—EBBR complex at −0.17 V. Under these conditions the limit of detection is 0.50 ng/mL. Experimental results for Mo in seawater using this technique agree well with certified values for two reference seawater samples (NASS-1, CASS-1).

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