Oryza sativa L. rice has large amounts of proteins and minerals, besides presenting several pigmented varieties. Red rice is distinguishable due to its great nutritional value compared to the regular white variety. Its red pericarp pigmentation is due to the bioactive compounds that are responsible for its health benefits. The objective of this study was to evaluate the physical-chemical characterization, antioxidant, antihyperglycemic and antihypertensive capacity of flours of three different red rice cultures (Rubi, Virgínia and Pequeno). All samples presented specific levels of carbohydrates for cereals with low fat content and excellent levels of protein and resistant starch. In addition, the samples had a high antioxidant, antihyperglycemic and antihypertensive capacity. Antihyperglycemic capacities were measured as percent inhibition for amylase (56.7-76.5%) and glycosidase (81.0-76.6%), respectively, and antihypertensive capacity as the percentage inhibition of the angiotensin converting enzyme (38.4-34.7%). In addition, Pequeno flour presented the best results for antioxidant and antihyperglycemic capacity in comparison to the two flours tested. Thus, all red rice flours can be a source of functional compounds when added to food.

RESUMO:A produtividade do arroz é definida por variáveis de ordem ambiental e genética, e o estudo da fenologia e do desenvolvimento da planta é de grande importância para poder explicar essas interações. Neste trabalho buscou-se estudar o comportamento em genótipos de tipos especiais de arroz pelos métodos de comparação de características morfológica, dos componentes de produção e adicionalmente pela análise de trilha nas variedades de arroz vermelho, branco e preto. O experimento foi conduzido no campus da UFRRJ, Seropédica-RJ, no ano agrícola de 2016/2017. Os genótipos avaliados foram dois de arroz vermelho ("ENA-AR 1601" e "Vermelho Virgínia") um de arroz branco ("BRS Esmeralda") e outro de arroz preto ("IAC 600"). Foram avaliadas nove características morfoagronômicas. O delineamento foi o em blocos ao acaso em parcelas subdivididas, com quatro repetições. Os tratamentos nas parcelas foram os quatro genótipos de arroz e nas subparcelas as duas colheitas (principal e soca). Após a análise de variância foram realizados o teste de médias, as correlações fenotípicas e a análise de trilha. Foi possível observar redução da produtividade de arroz da colheita principal para a soca. A maior estatura observada foi no genótipo "Vermelho Virgínia", sendo uma característica a ser melhorada nesse genótipo. Constatou-se que as características número de espiguetas viáveis por panícula e o número de perfilhos viáveis apresentaram a maior correlação positiva como efeito direto a variável produtividade dos genótipos de arroz na colheita principal. Palavras-chave:Oryza sativa L. Correlação fenotípica. Produtividade. MORFOAGRONOMIC TRAITS IN MAIN HARVEST AND RATOON AND TRACK ANALYSIS IN SPECIAL RICE TYPESABSTRACT: Rice's productive capacity is defined by environmental and genetic letters, and the study of plant phenology and development is of great importance in order to explain these

No abstract

Red rice is consumed in whole grain form due to its beneficial nutritional attributes and has become an option for crop diversification. Several factors during plant development can affect the crop’syield. This study evaluated the adaptability and stability of the post-harvest processing of red rice cultivars and compare them with those of white rice cultivars grown in the municipalities of Campos dos Goytacazes, Seropédica, and Pinheiral, RJ, between 2016 and 2018. Two white rice (BRS Esmeralda and IAC 201) and two red rice cultivars (ENA-AR1601 and Virginia) were distributed in the field under randomized block design with five repetitions. Yield, grain class, ingenuity, and whole grain yield were evaluated. The means of these parameters for cultivars in different locations and years were compared by Tukey’s test (P < 0.05). The Eberhart and Russell regression model was used to estimate the adaptability and stability parameters. The grain classification of the cultivars ENA-AR1601 and Virginia was medium and long, respectively. The red rice cultivars ENA-AR 1601 and Virginia showed higher productive performance than the national average. The red rice cultivars and BRS Esmeralda showed highly predictable behavior based on the environmental stimulus. With average values of 62% in the two years evaluated, the red rice cultivars showed excellent processing yield.

No abstract