CHANGES IN REDUCING SUGARS AND SUCROSE DURING STORAGE OF POTATO TUBERS FROM NEW CLONES

ABSTRACT

Tubers from three unnamed clones and the cultivar Red Pontiac were stored at 1º or 8ºC or maintained at 20 "C. The tubers in cold storage were held for 30, 60 or 90 days, then reconditioned at 20ºC for 10 days. Some were maintained at 1º or 8ºC for 180 days. No major differences were detected among all clones under the temperature regimes and storage periods studied. Storage at 1ºC stimulated reducing sugar and sucrose accumulation, particularly in the first weeks. No accumulation was detected for tubers stored at 8ºC or 20ºC. Reconditioning lowered somewhat the reducing sugar and sucrose concentrations.

RESUMO

Tubérculos de três novos clones de batata e da cv. "Red Pontiac" foram armazenados sob temperaturas de 1ºC, 8ºC e 20ºC. Os tubérculos armazenados sob condições de baixas temperaturas foram mantidos por 30, 60, 90 ou 180 dias e posteriormente recondicionados por 10 dias a 20ºC. Nenhuma diferença significativa foi detectada entre os clones sob as condições estudadas. O armazenamento a 1ºC estimulou o acúmulo de açúcares redutores e sacarose, principalmente nas primeiras semanas. O recondicionamento a 20ºC reduziu estas concentrações.