C. berlandieri ssp. berlandieri (C. berlandieri) is one of the most common members of the group of plants known as quelites, which are dark leafy greens widely consumed in Mexico. This study aimed to evaluate the impact of two drying procedures (oven drying and freeze-drying/lyophilization) on the polyphenolic composition, antioxidant capacity, and proximal chemical analysis of C. berlandieri leaves and inflorescences (raw or boiled). The results indicated that the raw freeze-dried samples had higher amounts (p < 0.05) of total phenolic compounds, total flavonoids, and antioxidant capacity, mainly in the inflorescence. The oven-dried samples showed an increased concentration of polyphenols after boiling, while the lyophilized samples showed a slightly decreased concentration. The drying process was observed to have little impact on the proximal chemical composition. Quantification by UPLC-DAD-ESI-QToF/MS identified up to 23 individual phenolic compounds, with freeze-dried samples showing higher amounts of individual compounds compared with oven-dried. Procyanidin B2 was found exclusively in the inflorescences. The inflorescences have a higher content of phenolic compounds and greater antioxidant capacity than the leaves. Regardless of the drying process, the leaves and inflorescences of C. berlandieri contain an interesting variety of phenolic compounds that may have beneficial effects on health.

Porophyllum ruderale (P. ruderale) is a well-known Mexican plant from the group of “Quelites”, widely consumed plant species used for several food and medicinal purposes. As the production is very heterogeneous and the diverse agroclimatic conditions significantly impact the plant’s phytochemical composition, this research aimed to compare the phenolic compound composition and the antioxidant capacity of the P. ruderale plant from three different collection sites (Queretaro, Landa de Matamoros, and Arroyo Seco) in the State of Queretaro (Mexico). Plants collected from Queretaro displayed the lowest total phenolic compounds, flavonoids, and condensed tannins, reflected in a lower antioxidant capacity (DPPH, FRAP, ABTS), compared to the other collection places. Flavones (epicatechin and epigallocatechin gallate) were the most abundant (36.1–195.2 μg equivalents/g) phenolics quantified by HPLC-DAD, while 31 compounds were identified by UHPLC-DAD-QToF/MS-ESI. Most compounds were linked to biological mechanisms related to the antioxidant properties of the leaves. A PCA analysis clustered Landa de Matamoros and Arroyo Seco into two groups based on flavones, hydroxybenzoic acids, the antioxidant capacity (ABTS and DPPH), and total phenolic compounds, the main contributors to its variation. The results indicated contrasting differences in the polyphenolic composition of collected P. ruderale in Queretaro, suggesting the need to standardize and select plants with favorable agroclimatic conditions to obtain desirable polyphenolic compositions while displaying potential health benefits.

Revista de investigación de Agronomía-Horticultura

The lifecycle of Bactericera cockerelli was evaluated on the tomato varieties ‘Charanda F1’ and ‘Rafaello’, under greenhouse conditions at the Colegio de Postgraduados, Campus Montecillo, Texcoco, Mexico, during October–December, 2009 and January–March, 2010. A line of B. cockerelli dating from 10 years ago free from agrochemical applications was used. The adults were kept in individual growth chambers. The parameters measured were average life expectancy (ex), net reproductive ratio (Ro), time of generation (T), intrinsic natural increase ratio (rm), finite increase ratio (λ), births (b), and mortality (d) in each of the varieties. For the October–December cycle, reproduction began at 34 days in the ‘Charanda F1’ variety, and at 41 days in January–March. The incubation period for the eggs was 7–13 days, with a nymphal period of 32–37 days in ‘Charanda F1’; in ‘Rafaello’, incubation took 8–10 days, with a nymphal period of 31–35 days. The lifecycle in Charanda F1 was 63–69 days, and was 68–70 da... Resumen. Se evaluó el ciclo de vida de Bactericera cockerelli (Sulc), en las variedades de jitomate ‘Charanda F1’ y ‘Rafaello’, en condiciones de invernadero en el Colegio de Postgraduados, Campus Montecillo, Texcoco, México, durante Octubre–Diciembre de 2009 y Enero–Marzo de 2010. Se utilizó una cría de B. cockerelli que data de hace 10 años libre de aplicación de agroquímicos. Los adultes fueron mantenidos en cámaras de cría individuales. Los parámetros medidos fueron esperanza media de vida (ex), tasa neta de reproduction (Ro), tiempo de generation (T), tasa intrínseca de incremento natural (rm), tasa finita de incremento (λ), natalidad (b) y mortalidad (d), en cada una de las variedades. Para el ciclo Octubre-Diciembre, la reproducción initió a los 34 días en la variedad ‘Charanda F1’ y a los 41 días en Enero–Marzo. Los períodos de incubatión para el estado de huevo fueron de 7–13 días y un período ninfal de 32–37 días en ‘Charanda F1’; en ‘Rafaello’ de 8–10 días y un período ninfal de 31–35 días. El ...