Bulb development in the onion (<i>Allium cepa</i>L.) and the effect of storage temperature on bulb rest

Abdalla, Abdalla; Mann, Louis K.

doi:10.3733/hilg.v35n05p085

Cited by 58 publications

(21 citation statements)

References 23 publications

(15 reference statements)

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“…However, environmental factors particularly temperature, affect dormancy and may prolong or shorten the dormancy period. The commercial storage period for onion bulbs is characterized by the initiation of root growth and sprout elongation (Abdallah and Mann, 1963).…”

Section: Introductionmentioning

confidence: 99%

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

Benkeblia

2004

Braz. J. Plant Physiol.

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The respiration rate (RR) (CO 2 production), activation energy (E a ) and Q 10 of maleic hydrazide-treated onion bulbs (Allium cepa, cv. Rouge Amposta) at 20.10 -6 mol.L -1 (MH 1 ) and 45.10 -6 mol.L -1 (MH 2 ) were measured at 4, 10 and 20ºC. Immediately after treatment, the Q 10 of MH-treated and control bulbs were not significantly different. After 8 weeks of storage, Q 10 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, MH 1 and MH 2 were 0.43, 0.32 and 0.26 mmol CO 2 .kg -1 .h -1 at 20ºC respectively; and 0.26, 0.20 and 0.17 mmol CO 2 .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 MH 1 and MH 2 -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.Key words: activation energy, MH, onion, Q 10 , respiration rate, sprouting, storage.Efeito da hidrazida maléica sobre parâmetros respiratórios de bulbos armazenados de cebola (Allium cepa L.): A taxa respiratória (produção de CO 2 ), energia de ativação (Ea) e Q10 de bulbos de cebola (Allium cepa, cv. Rouge Amposta) tratados com hidrazida maléica nas concentrações de 20.10 -6 mol.L -1 (MH 1 ) e 45.10 -6 mol.L -1 (MH 2 ) foram medidas a 4, 10 e 20ºC. Imediatamente após os tratamentos, os valores de Q10 de bulbos do tratados e controles não foram diferentes. Após 8 semanas de armazenamento, os valores de Q10 dos controles e dos bulbos tratados aumentou, ficando entre 2,34 e 2,89. A taxa respiratória dos bulbos aumentou durante a armazenagem e após 24 semanas, os valores do controle de MH1 e MH2 foram 0,43, 0,32 and 0,26 mmol CO 2 .kg -1 .h -1 a 20ºC respectivamente, e 0,26, 0,20 e 0,17 mmol CO 2 .kg -1 .h -1 a 10ºC respectivamente. A 4ºC, não se observou diferença entre controle e bulbos tratados com hidrazida maléica. Após 24 semanas, as brotações do controle, MH 1 e MH 2 foram 75%, 38% e 33% a 20ºC respectivamente, e 50%, 22% e 17% a 10ºC respectivamente. A 4ºC, o nível de brotação nos bulbos-controle não excedeu 7%, sendo de 5% para os tratados. Nenhuma diferença foi observada quanto ao apodrecimento de ambos os bulbos, e o pouco apodrecimento verificado a 4ºC poderia ser atribuído à baixa temperatura do que a um efeito do tratamento com hidrazida maléica.

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Section: Introductionmentioning

confidence: 99%

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

Benkeblia

2004

Braz. J. Plant Physiol.

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“…One of the most popular approaches in the study of dormancy has been to study its physiological basis in sprouts during subsequent exposure to rest-breaking treatments at low temperature (Benkeblia & Selselet-Attou, 1999;Dennis, 1987). The resting period disappears progressively with time at all storage temperatures, but does so more quickly at some low temperatures than others (Abdallah & Mann, 1963;Benkeblia & Selselet-Attou, 1999). Gradual changes in the biochemistry of the bulbs throughout the dormancy period were observed, and low temperatures caused compositional and physiological changes in tissues (Benkeblia et al, 2002;Benkeblia et al, 2000;Benkeblia & Selselet-Attou, 1999).…”

Section: Introductionmentioning

confidence: 99%

Chilling effect on soluble sugars, respiration rate, total phenolics, peroxidase activity and dormancy of onion bulbs

Benkeblia

Shiomi

2004

Sci. agric. (Piracicaba, Braz.)

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Besides onions being one of the most cultivated and consumed vegetables, during storage onion bulbs are still affected by many physiological, biochemical and technological factors which can influence their quality. Respiration rate (RR O2 ), soluble sugars (SS), total phenolics (TP), and peroxidase (POD) activity were measured in inner bud tissues during a dormancy break of onion bulbs treated four weeks at 0ºC and stored in the dark at 20ºC. Control bulbs were stored simultaneously in the same condition. Breakage of dormancy was checked by the appearance of first green internal leaves by cutting longitudinally 30 bulbs. After eight weeks, RR O2 of sprouted onions was 52% higher than that of freshly harvested and dormant bulbs. One week after cooling SS decreased from 15 to 9 mg g -1 fresh weight, and then peaked from 9 to 19 mg g -1 after three weeks. For control bulbs, a similar peak was observed after six weeks. For inner buds of cold-treated onions, a slight increase of TP (from 0.17 to 0.2 mg g -1 ; fresh weight) was observed during the first two weeks of cooling, and then a decrease to 0.11 mg g -1 was observed after eight weeks. For inner buds of control bulbs, TP also increased slightly from 0.17 to 0.2 mg g -1 after five weeks, and decreased to 0.15 mg g -1 after seven weeks when bulbs began to sprout. POD activity showed a similar pattern in relation to TP. For cold-treated bulbs, POD activity increased to 1.7 U g -1 fresh weight after two weeks, and decreased to 1.1 U g -1 during the last four weeks. For control samples, POD activity was stable during 4 weeks and decreased progressively by 29% during the last four weeks. This decrease in POD activity coincided with the decrease in TP, and coincided with onset of sprouting. With cold treatment, first sprouts were observed during the third week, while total sprouting was observed after eight weeks. In comparison, only 20% of the control bulbs sprouted after the period of 8 weeks. Key words: O 2 consumption, saccharides, phenolics, peroxidase, sprouting EFEITO DO RESFRIAMENTO SOBRE AÇÚCARES SOLÚVEIS, TAXA DE RESPIRAÇÃO, FENÓIS TOTAIS, ATIVIDADE DE PEROXIDASE E DORMÊNCIA DE BULBOS DE CEBOLARESUMO: Além de ser uma das hortaliças mais cultivada e consumida, bulbos de cebola são afetados, durante a armazenagem, por fatores fisiológicos, bioquímicos e tecnológicos, que podem afetar seus atributos de qualidade. Taxa de respiração (RR O2 ), açucares solúveis (SS), fenóis totais (TP) e atividade de peroxidase (POD) foram medidos em tecidos internos de brotos, durante uma quebra de dormência de bulbos de cebola, tratados por quatro semanas a 0ºC e armazenados no escuro a 20ºC. Bulbos controle foram armazenados simultaneamente na mesma condição. A quebra da dormência foi verificada através do aparecimento das primeiras folhas internas verdes, cortando 30 bulbos longitudinalmente. Depois de oito semanas a RR O2 de bulbos brotados foi 52% maior em relação a bulbos recentemente colhidos e bulbos dormentes. Os SS diminuíram uma semana após resfriamento, de 1...

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“…It was observed that the longer bulbs remained in the store before planting, the more rapid the sprouting response, indicating a gradual depletion in dormancy during storage. For bulbs remaining in dry storage, leaf initiation can sometimes be observed within c. 2 wk (Abdalla & Mann, 1963 ;Pak et al, 1995). The elongation of sprout leaves and initiation of additional new leaves occurred from c. 40-50 d of storage (Aoba, 1955a,b), whereas visible sprouting occurred after a further 1-2 months.…”

Section: Bulb Development and Dormancymentioning

confidence: 99%

“…In experiments by Abdalla & Mann (1963) bulbs were periodically removed from storage and planted in moist sphagnum. Sprouting was inducible after 2 wk storage indicating the start of post-dormancy.…”

Section: Bulb Development and Dormancymentioning

confidence: 99%

The expression of histone 2A in onion (Allium cepa) during the onset of dormancy, storage and emergence from dormancy

1999

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The tissue-specific and developmental expression of histone 2A was studied in onion (Allium cepa ' Robusta '), using northern blots. Histone 2A expression was enriched in basal tissues, particularly in the inner, meristematically active parts of bulbs. The expression was assessed during a time course of bulb development, dormancy onset and post-harvest sprouting in field-grown material. During bulb development histone 2A expression in the inner bulb declined rapidly during bulb ripening, reaching a minimum with the onset of dormancy. During post-harvest storage, expression increased slowly, reaching a peak in the spring, coinciding with the first observed sprout emergence. It was concluded that in onion, as in other plant systems, histone 2A expression is linked to cell division and dormancy level, the peak in expression during post-harvest storage indicating the time of dormancy breakage. In cultivars where post-harvest sprouting occurred much earlier or much later than in ' Robusta ', this expression peak occurred at about the same time of year, regardless of sprouting time. It was concluded that differences in storage longevity between cultivars were not due to differing times of dormancy breakage. Factors controlling the rate of sprout emergence post-dormancy are likely to be major determinants of storage capacity.

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Bulb development in the onion (Allium cepaL.) and the effect of storage temperature on bulb rest

Cited by 58 publications

References 23 publications

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

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

Chilling effect on soluble sugars, respiration rate, total phenolics, peroxidase activity and dormancy of onion bulbs

The expression of histone 2A in onion (Allium cepa) during the onset of dormancy, storage and emergence from dormancy

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