Mechanical damage and storage conditions may alter carbohydrate metabolism and oxidative enzyme activity, causing darkening and impairing the use of tubers in pre-fried potato processing industry. The objective of this study was to evaluate the enzymatic changes and carbohydrate metabolism of ‘Markies’ potato tubers subjected to mechanical damage and exposed to high temperatures before processing. The tubers were stored for 4 months at 8 °C, and further divided into treatment with impact and abrasion damage; and control treatment, in which the tubers were not damaged. Afterwards, they were stored at 28 °C room temperature, evaluated for loss of accumulated fresh mass (FML); total soluble sugar (TSS), reducing sugar (RS) and non-reducing sugar (NRS); color after frying and activity of polyphenoloxidase (PPO) and peroxidase (POD) at 0, 12, 24, 36 and 48 h after placed at room temperature. The mechanical damages incremented FML, RS, PPO and TSS, NRS and POD up to 35.6, 34, and 22 h, respectively. Regardless of the occurrence of mechanical damage and the period of evaluation, the sticks showed a light color after frying and were classified in category 2. The increase in the evaluation time led to the rise in FML and the PPO activity. It is concluded that the mechanical damages increase the FML and cause darkening of the tips of the sticks after frying, however this variety still display qualities that are suitable for industrial processing.
O Mercado de pimentas ornamentais está crescendo nos últimos anos, nacionalmente e internacionalmente, e tem estimulado o desenvolvimento de programas de melhoramento visando novas variedades de pimenta com caracteres desejáveis para o mercado ornamental. O uso da análise fatorial é uma técnica multivariada que permite reduzir um conjunto de variáveis em um número reduzido de fatores latentes, o que facilita o estudo de um conjunto de dados. O objetivo do presente trabalho foi avaliar o potencial ornamental de genótipos de pimenta com base em análise fatorial. Foram avaliados 29 genótipos de Capsicum annnuum, com base em 12 características quantitativas, em delineamento inteiramente casualizado, com 5 repetições. As 12 características avaliadas foram resumidas em 3 fatores: qualidade de fruto (8 variáveis), porte da planta (2 variáveis) e arquitetura de planta (2 variáveis). Dentro de cada fator então as variáveis que são altamente correlacionadas. Os valores dos fatores foram preditos através dos escores. Por meio destes foram confeccionados gráficos para verificar o comportamento dos genótipos de C. annuum em relação aos fatores obtidos. 12 genótipos foram selecionados como os de maior potencial para ornamentação, podendo ser utilizados em futuros cruzamentos.
The present work had as main objective to use factor analysis to describe the structure of variability of characteristics considered commercially important in ornamental pepper, aiming to summarize the information contained in such variables in a smaller number of latent variables or factors. For that, 12 quantitative traits were evaluated in 29 pepper genotypes (Capsicum annuum). Of the factors created, 3 presented practical interpretation, grouping a total of 12 variables into factors related to “fruit quality” (8 variables), “plant size” (2 variables) and “plant architecture” (2 variables).
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