Resumo

REIS CANTO, Alisson; DA SILVA FONSECA JUNIOR, nelson  e  BELEIA, Adelaide. Chemical and histological changes in stored cassava roots of cultivars Catarina Amarela and Catarina Branca. Acta Agron. [online]. 2013, vol.62, n.2, pp.105-113. ISSN 0120-2812.

The research aimed evaluate and compare chemical and histological changes occurring after harvest of cassava roots (Manihot esculenta Crantz) of cultivars Catarina Amarela and Catarina Branca. The cassava grown at Instituto Agronômico do Paraná - Londrina-BR, had the foliage of the plants cut 30 days before harvest, and roots were collected at 10 months of age. The roots were stored for 5 days at environment conditions and submitted to evaluation of the degree of physiological deterioration, moisture content, activities of the enzymes polyphenoloxidase and peroxidase, content of phenolic compounds, detection and localization of hydrogen peroxide, composition in carotenoids, cellulose, lignin, and microscopy of the parenchyma. After storage the cultivars presented physiological deterioration and changes in moisture content, activities of peroxidase, content of phenolic compounds and lignin. Both cultivars showed no polyphenoloxidase activity. Alterations histological were observed, which is more pronounced in Catarina Amarela. The cultivars Catarina Amarela and Catarina Branca presents chemical and histological changes after storage, and Catarina Branca the most resistant to post-harvest changes.

Palavras-chave : Alteration after harvesting; chemical composition; Manihot esculenta.

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