scholarly journals Changes in endogenous growth inhibitors in onion bulbs (Allium cepa L.) cv. Sochaczewska during storage

2013 ◽  
Vol 41 (2) ◽  
pp. 265-274
Author(s):  
Elżbieta Kielak ◽  
Maria Bielińska-Czarnecka ◽  
Helena Różycka
Keyword(s):  
Endogenous Growth ◽  
Allium Cepa ◽  
Storage Period ◽  
Weather Conditions ◽  
Growth Inhibitors ◽  
Inhibitor Activity ◽  
Onion Bulbs ◽  
Cold Room ◽  
Allium Cepa L ◽  
Two Peaks

Changes in inhibitor activity in the onion bulbs (<i>Allium cepa</i> L.) cv. Sochaczewska during storage were investigated. Onions were dried under an umbrella roof until October 15th or November 15th and thereafter stored in a cold-room at 0-1°C until May 15th. The activity of inhibitors fluctuated markedly during the storage period. At least two peaks and two decreases of inhibitor activity were observed. The weather conditions seemed to strongly influence the level and the date of appearance of inhibitors in onions. Higher inhibitor activity is usually connected with better storage and less sprouting of onions during storage. Prolonged drying under an umbrella roof enhanced onion quality after storage only in these cases when it actually improved the drying of onions.

scholarly journals Changes in endogenous cytokinin-like substances in onion bulbs (Allium cepa L.) cv. Sochaczewska during storage

2013 ◽  
Vol 46 (1) ◽  
pp. 73-81
Author(s):  
Elżbieta Kielak ◽  
Maria Bielińska-Czarnecka
Keyword(s):  
Storage Period ◽  
Weather Conditions ◽  
Clear Correlation ◽  
Cytokinin Activity ◽  
Onion Bulbs ◽  
Cold Room ◽  
Allium Cepa L ◽  
One Year ◽  
The Moment ◽  
Main Factor

Onion bulbs cv. Sochaczewska were dried under an umbrella roof until October 15th or November 15th and thereafter stored in a cold room at 0-1°C until May 15th. During 4 years of the experiment, the activity of cytokinin-like substances was determined each month during storage. The cytokinin activity showed two to three peaks: at the beginning of storage, in January-February (in one year in December) and at the end of the storage period. No clear correlation was found between cytokinin activity and bulb rooting or sprouting. The length of the drying period occasionally influenced the height of cytokinin activity peaks and displaced the moment of their appearance. Weather conditions in particular years seem to be the main factor influencing the changes in cytokinin activity.

scholarly journals Storage diseases of onion under variable conditions

2015 ◽  
Vol 26 (1) ◽  
pp. 45-50
Author(s):  
MS Mahmud ◽  
MS Monjil
Keyword(s):  
Allium Cepa ◽  
Disease Incidence ◽  
Fungal Diseases ◽  
Vegetable Crop ◽  
Local Varieties ◽  
Storage Diseases ◽  
Onion Bulbs ◽  
Cold Room ◽  
Allium Cepa L ◽  
The World

Onion (Allium cepa L.) is an important and familiar spice as well as vegetable crop throughout the world. Storage rot due to various diseases caused by bulb rotting fungi is a major constrain for storing onion year-round in Bangladesh. The fungi associated with onion collected from different markets of Mymensingh, Naogaon and Sathkhira districts of Bangladesh were studied aiming to record the incidence of storage diseases as well as storage variability and conditions on disease incidence of onion. Disease incidence was recorded from storage of the retailers in two local varieties of onion,viz.,Taherpuri, Faridpuri and one Indian variety Pusa Red. Initially, infected onion bulbs were found maximum in Faridpuri and minimum amount was found in Pusa Red. Month-wise disease incidence showed that highest number of infected onion bulbs was found in Pusa Red and lowest number of infected bulbs was found in Taherpuri. Similarly highest disease incidence (%) was recorded in Pusa Red and lowest disease incidence (%) was recorded in Therpuri. Among the different markets average number of fungal infected bulbs was highest in the samples collected from Dhamoirhat bazaar of Naogaon district and lowest in the samples collected from Natun bazaar of Mymensingh district. Highest infected bulbs were found in onions stored in cold room (6°C) followed by Free floor and Bamboo basket. Lowest infected bulbs were found in onions stored in dried sands followed by net-bag and jute bag. Thus, the fungal diseases in storage are higher in large sized onion bulbs than indigenous small sized onions and in cold room (6°C) than net-bag or jute bag.Progressive Agriculture 26:45-50, 2015

scholarly journals Changes in endogenous gibberellin-like substances in onion bulbs (Allium cepa L.) cv. Sochaczewska during storage

2013 ◽  
Vol 44 (1-2) ◽  
pp. 65-71
Author(s):  
Elżbieta Kielak ◽  
Maria Bielińska-Czarnecka
Keyword(s):  
High Activity ◽  
Allium Cepa ◽  
Late Spring ◽  
Endogenous Gibberellin ◽  
Onion Bulbs ◽  
Cold Room ◽  
Allium Cepa L ◽  
Gibberellin Activity ◽  
Almost All

Onions cv. Sochaczewska were dried up under an umbrella roof till October 15th or till November 15th and thereafter stored in a cold room at 0-1°C until May 15th. During 4-year of experiment gibberellin activity was determined each month during storage. Three periods of high activity of gibberellins were found in most cases: in December, in February-March and in late spring. In general, onions dried longer (till November 15th), showed lower gibberellin activity than onions dried shorter. Gibberellin-like substances under investigation are localized in almost all Rf zones of chromatogram. Sprouting and rooting was related to gibberellin activity.

scholarly journals Effect of maleic hydrazide on respiratory parameters of stored onion bulbs (Allium cepa L.)

2004 ◽  
Vol 16 (1) ◽  
pp. 47-52 ◽  
Author(s):  
Noureddine Benkeblia
Keyword(s):  
Activation Energy ◽  
Respiration Rate ◽  
Allium Cepa ◽  
Maleic Hydrazide ◽  
Co2 Production ◽  
Onion Bulbs ◽  
Respiratory Parameters ◽  
Allium Cepa L ◽  
Significant Difference ◽  
And Control

The respiration rate (RR) (CO2 production), activation energy (Ea) and Q10 of maleic hydrazide-treated onion bulbs (Allium cepa, cv. Rouge Amposta) at 20.10-6 mol.L-1 (MH1) and 45.10-6 mol.L-1 (MH2) were measured at 4, 10 and 20ºC. Immediately after treatment, the Q10 of MH-treated and control bulbs were not significantly different. After 8 weeks of storage, Q10 of control and both MH-treated bulbs increased and ranged from 2.34 and 2.89. Respiration rate of onions increased during storage, and after 24 weeks, RR values of control, MH1 and MH2 were 0.43, 0.32 and 0.26 mmol CO2.kg-1.h-1 at 20ºC respectively; and 0.26, 0.20 and 0.17 mmol CO2.kg-1.h-1 at 10ºC respectively. At 4ºC, no significant difference was observed between control and MH-treated bulbs. After 24 weeks, sprouting of the control and MH1 and MH2-treated bulbs was 75%, 38% and 33% at 20ºC respectively, and 50%, 22% and 17% at 10ºC respectively. At 4ºC, the sprouting level of control bulbs did not exceed 7% and was 5% for MH-treated bulbs. No difference was observed in rotting of control and MH-treated bulbs, and the low rotting observed at 4ºC could be attributed to low temperature rather than maleic hydrazide treatment.

scholarly journals Effects of plant density and cultivar on yield responses in onions (Allium cepa L.) grown from seeds

2013 ◽  
Vol 50 (1-2) ◽  
pp. 221-229
Author(s):  
Jan Rumpel ◽  
Kazimierz Felczyński
Keyword(s):  
Allium Cepa ◽  
Field Experiments ◽  
Plant Density ◽  
Leaf Fall ◽  
Marketable Yield ◽  
Onion Bulbs ◽  
Allium Cepa L ◽  
Yield Responses ◽  
Bulb Yield ◽  
Size Grading

Two field experiments were conducted to study the effect of plant density on yield, size grading and maturity of onion bulbs grown from seeds. In the first experiment carried out during 1991-1993, three onion cultivars (Hysam F<sub>1</sub> , Mercato F<sub>1</sub> and Sochaczewska) were sown for intended densities of 20, 40, 60, 80,100 and 140 plants m<sup>-2</sup>, whereas in the second one, in 1996, six onion cultivars (Spirit F<sub>1</sub>, Summit F<sub>1</sub>, Hyduro F<sub>1</sub>, Armstrong F<sub>1</sub>, Renate F<sub>1</sub> and Robusta) were sown for intended densities of 40, 60 and 80 plants m<sup>-2</sup>. The onions were grown on beds, 1,35 m wide, in 4 rows per bed (27+27+27+54 cm). Marketable yield increased with plant density, and depending on year was highest at 80 or 100 plants m<sup>-2</sup>. The average marketable yield of the 1991-1993 experiment increased from 20.5 t·ha<sup>-1</sup> at 20 plants m<sup>-2</sup> to 32.8 t·ha<sup>-1</sup> at 80 plants m<sup>-2</sup>, whereas that of the 1996 experiment increased from 48,9 t-ha<sup>-1</sup> at 40 plants m-2 to 59.0 t·ha<sup>-1</sup> at 80 plants m<sup>-2</sup>, respectively. Yield of large bulbs decreased with density and was highest at 20-40 plants m<sup>-2</sup>, oposite to the yield of small bulbs, which was highest at the highest density of 140 plants·m<sup>-2</sup>. The medium bulb yield increased with density, at the some way as compared the total marketable yield. No greater effect of cultivar on bulb size grades was found and the existing differences were proportional to the total marketable yield . Plant density hastened maturity of onions, and at density of 140 plants m<sup>-2</sup> the leaf fall-over occurred 9-10 days earlier as compared at density of 20 plants m<sup>-2</sup>. The cultiwars used. can be placed in the following order of decreasing productivity: 1 . Mercato F<sub>1</sub>, 2. Hysam F<sub>1</sub> and 3. Sochaczewska, - in the first expeiiment (1991-93) and 1. Annstrong F<sub>1</sub>, 2. Spirit F<sub>1</sub>, 3. Robusta, 4. Renate F<sub>1</sub>, 5. Hyduro F<sub>1</sub> and 6. Summit F<sub>1</sub> - in the second experiment (1996), respectively.

Modified atmosphere packaging of onion bulbs (Allium cepa L.)

2001 ◽  
Vol 21 (3) ◽  
pp. 297-302
Author(s):  
Noureddine Ake ◽  
Brice Benkeblia ◽  
Patrick Varoquaux
Keyword(s):  
Allium Cepa ◽  
Modified Atmosphere Packaging ◽  
Modified Atmosphere ◽  
Onion Bulbs ◽  
Allium Cepa L
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