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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. A taxa respiratória (produção de CO2), 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 (MH1) e 45.10-6 mol.L-1 (MH2) 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 CO2.kg-1.h-1 a 20ºC respectivamente, e 0,26, 0,20 e 0,17 mmol CO2.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, MH1 e MH2 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

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