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Horticultura Brasileira

versão impressa ISSN 0102-0536versão On-line ISSN 1806-9991

Resumo

PASTORINI, Lindamir H. et al. Production and non-structural carbohydrates content in potato tubers obtained in two planting times. Hortic. Bras. [online]. 2003, vol.21, n.4, pp.660-665. ISSN 0102-0536.  http://dx.doi.org/10.1590/S0102-05362003000400018.

Potato tubers, cv. Atlantic and Pérola, harvested in autumn (53; 68 and 100 days after the planting - DAP) and spring cultivation (70, 78 and 99 DAP) were classified in relation to the diameter (<30 mm, 30-50 mm and >50mm), counted and the fresh mass determined individually. Samples were collected and analyzed for the content of starch, total soluble carbohydrates, reducer sugars and sucrose. During autumn cultivation, the tubers of cv. Atlantic presented higher fresh mass at the end of the cycle and the cv. Pérola presented greater number of tubers in all the collections. In the spring cultivation the cv. Pérola presented higher average fresh mass in tubers, and in both cultivars was observed a reduction in the productivity at the end of the cycle, perhaps as a response to water stress verified in the period. Content of starch was significantly larger in the cv. Pérola at 53 and 100 DAP of the autumn cultivation, while the cv. Atlantic presented significantly larger values of total soluble carbohydrates at 53 DAP. Reduction in reducing sugars and sucrose content was observed in both cultivars at the end of the autumn cultivation. The content of starch and total soluble carbohydrates decreased, in both cultivars along the spring cycle. No differences between cultivars in relation to reducing sugars and sucrose content were observed at the end of the spring cultivation.

Palavras-chave : Solanum tuberosum; starch; reducers sugars; sucrose.

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