Multiline aiming at phenotypic stability and rice blast resistance

This study aimed to verify the efficiency of multilines in reducing blast progress and their potential benefits to phenotypic stability in rice. The experiments were conducted in the 2016/17 and 2017/18 agricultural years. A randomized block design was performed with three replications, evaluating 12 lines and a multiline, which consisted of five lines from the Cultivation and Use Value (CUV) test. The multiline presented an estimated grain yield above the average of experiments of around seven bags ha-1 and superior performance in early flowering, justifying the high phenotypic stability for these characters. In this case, the line selection for composing the multiline was favorable and efficient, highlighted by a higher agronomic performance than most lines of the CUV test. The multiline is an adequate strategy to provide higher phenotypic stability and reduce blast progress in the field.

Embalagem a vácuo: efeito no escurecimento e endurecimento do feijão durante o armazenamento / Vacuum package: its effect on the hardening and darkening of the beans during storage

A influência do uso de embalagem a vácuo no controle do escurecimento e endurecimento do tegumento foi avaliada em feijões da cv. 'Pérola'. Os feijões após secos foram submetidos a diferentes embalagens: polietileno seladas a vácuo (espessura de 80µm), polietileno seladas sem vácuo (espessura de 80µm) e embalagem comercial (espessura de 20µm), armazenados por oito meses em condições ambiente. Foram realizadas análises de umidade, tempo de cozimento, cor, atividade enzimática e compostos fenólicos, logo após a secagem e em intervalos de dois meses até o oitavo mês. O tempo de cozimento foi maior para os grãos acondicionados em embalagem comercial do que nas outras embalagens, ao final do armazenamento. Os grãos embalados em sacos de polietileno selados a vácuo apresentaram menor queda nos valores de L*. As amostras da embalagem selada a vácuo apresentaram atividade da Peroxidase e Polifenoloxidase inferior aos grãos da embalagem comercial. O teor de fenólicos totais não apresentou diferença significativa. O uso da embalagem selada a vácuo foi eficiente em retardar o aumento no tempo de cozimento, o escurecimento do tegumento, a atividade das enzimas Polifenoloxidase e Peroxidase da cultivar 'Pérola', durante o armazenamento por oito meses em condição ambiente.

The influence of using vacuum packaging to control browning and hardening of the seed coat was evaluated in beans cv. 'Pérola'. The beans after dried, were subjected to different packaging: vacuum sealed polyethylene (thickness: 80μm), no vacuum sealed polyethylene (thickness: 80μm) and commercial packaging (thickness: 20μm), stored for eight months under ambient conditions. Analyses of moisture, cooking time, color, enzymatic activity and phenolic compounds, shortly after drying and at intervals of two months until the eighth month. Cooking time was longer for the beans packed in commercial packaging, than in the other containers at the end of storage. The grains packed in polyethylene bags sealed under vacuum showed less decline in the values of L *. The samples will vacuum sealed package showed peroxidase activity and polyphenoloxidase below the grain of commercial packaging. The total phenolic content was not significantly different. The use of vacuum sealed package will was effective in slowing the increase in cooking time, the darkening of the integument, the activity of the enzymes polyphenoloxidase and peroxidase of bean cv. 'Perola' during storage for eight months at ambient condition.