Individual kernel weight (KW) is largely genetically determined, and its variability is achieved through different combinations of rate and duration of kernel growth. Genetic variability for grain‐filling patterns has been observed among inbred lines and commercial hybrids, and there is current interest on dissecting its genetic basis. However, suitable grain filling phenotyping protocols are still to be determined, such as the value to study traits at the inbred or hybrid levels. The objective of our study was to evaluate the correlation between parental inbred line and derived hybrid performance for several grain‐filling traits in maize (Zea mays L.). We hypothesized that there would be high correlations due to the relative high heritability of grain‐filling traits. Three trials were conducted (two in Argentina and one in the United States) with commercial relevant germplasm (totaling 25 parental inbreds and 31 single‐cross hybrids). Traits were KW, kernel growth rate (KGR), grain‐filling duration (GFD), maximum water content (MWC), moisture concentration at physiological maturity (MCPM), and kernel desiccation rate (KDR) during the effective grain filling. Both heterosis and correlations between midparental value and hybrid performance were significant (p < 0.05) for all traits (r values of 0.63, 0.71, 0.81, 0.83, 0.61, and 0.71 for KW, KGR, GFD, MWC, KDR, and MCPM, respectively). Our results confirm that studying inbred lines for grain‐filling traits generates valuable information for derived hybrid performance.
Maize (Zea mays L.) grain yield has a parabolic response to stand density changes, creating an optimum stand density that maximizes yield. Argentinean commercial hybrids differ in their optimum stand density when grown at similar environments, generating the need to test precommercial hybrids for adequate product management recommendations. For breeding purposes, any information from parental inbred lines that is indicative of derived hybrid performance is highly desirable. However, correlations between parental inbred line and derived hybrid performance for maize yield response to stand density are unknown. We characterized a set of maize inbred lines and derived single cross hybrids (9 female and 5 male inbreds, 42 hybrids) during two growing seasons for their yield response to stand density to evaluate the correlation between parental inbred line and derived hybrid performance. Significant (p < 0.01) hybrid differences were found for yield at different stand densities, optimum stand density, and yield at optimum stand density. However, correlations between parental inbred line and derived hybrid performance were not significant for optimum stand density. Despite the lack of correlation, specific parental inbreds producing hybrids with higher optimum stand density or higher yield at optimum stand density were evident. Our results indicate that pedigree information, more than the specific inbred response to stand density, is relevant for estimating derived hybrid stand density yield response.
Y el barco con ocho velas y cincuenta cañones bombardeará la ciudad. Y en el tercer día la ciudad será arrasada. Sólo un hotel miserable quedará a salvo y sin un rasguño.Y el barco con ocho velas y cincuenta cañones desaparecerá conmigo a bordo."La pirata Jenny", The Three Penny Opera, BERTOLT BRECHT A treinta años del golpe militar en Chile, es útil repensar la violencia de los gobiernos totalitarios que arrasaron el Cono Sur en las décadas del setenta y el ochenta del siglo veinte. La represión desatada por las fuerzas militares fue ejercida no sólo contra el cuerpo social (y la metáfora aquí no es ni caprichosa ni casual), sino contra los cuerpos individuales que se opusieron al autoritarismo y a la simplificación de la patria en un sistema simbólico que preservaba exclusiones y privilegios. La naturalización de esta supuesta patria "nacional, occidental y cristiana" está todavía presente en las narrativas nacionales de los países que sufrieron la represión. En este sentido es importante buscar formas teóricas que nos proporcionen posibilidades de imaginar lo nacional desde un lugar diferente: no sólo desnaturalizar la identidad, sino también naturalizar esta desnaturalización, tal cual ha hecho la teoría queer en su análisis de los géneros sexuales.La posibilidad de leer el arte y la literatura que reflexionan sobre este periodo desde una perspectiva queer nos ofrece una oportunidad de imaginarnos cómo podemos concebir los espacios de identificación desde puntos de vista diferentes. Si la herencia de las dictaduras
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