Gaucha Research Articles

Rootstock-scion interaction: 2.effect on the composition of cabernet sauvignon grape must.

ABSTRACT - The interaction between rootstock, scion and the environment may induce different responses to the grapevine physiology and, consequently, to the grape composition. The vineyards of Serra Gaucha, Brazil, are established in different soil types, each with different morphological and physicochemical attributes. Moreover, the grapevines are grafted onto a diversity of rootstocks. Therefore, this study aimed to determine the effect of 15 rootstocks in the composition of the Cabernet Sauvignon (CS) grape must. The following rootstocks were used: Rupestris du Lot, 101-14 Mgt., 3309 C, 420A Mgt., 5BB K, 161-49 C, SO4, Solferino, 1103 P, 99 R, 110 R, Gravesac, Fercal, Dogridge and Isabel, featuring some genetic diversity altogether. The experimental design was in randomized blocks with 15 treatments, three replicates, 10 vines per plot. The grapes were harvested at maturity for four years, and then crushed for winemaking. Next, the grape musts were centrifuged to separate the solid phase from the liquid phase, which was used for analyses related to sugar, acidity and minerals. The data were submitted to correlation analysis and Principal Component Analysis. The main results from the average of four years show that, in general, the grape musts of the CS/101-14 Mgt., CS/161-49 C, CS/3309 C, CS/Rupestris du Lot and CS/Gravesac combinations had high values of density, total soluble solids, pH and °Brix/titratable acidity ratio, and low titratable acidity, which was high with CS/99 R, CS/110 R, CS/Dogridge and CS/1103 P. Potassium had higher concentrations in the grape musts of CS/SO4 and CS/5BB K. Titratable acidity did not correlate with density and total soluble solids, but positively correlated with yield. Density, total soluble solids, and the concentration of potassium were positively correlated with pH. Index terms: Vitis vinifera, grapevine, grafting, composition, minerals.

Inserção internacional do Rio Grande do Sul: vantagens comparativas reveladas e comércio intraindústria

The objective of this work is to analyze the specialization and the standard of the ‘gaucha’ industry foreign trade flow. To identify the products of comparative advantage holders the index of revealed comparative advantage of Balassa and the symmetrical index of revealed comparative advantage were used. The ‘gaucha’ industry presented revealed comparative advantage until year 2000, decreasing from then. The approach of intra-industry trade was adopted to determine the pattern of industrial flow of Rio Grande do Sul foreign trade. It reached a standard intra-industry from 1996 to 2006, showing considerable degree of product differentiation and economies of scale. Key words: ‘gaucha’ industry, comparative advantage, intra-industry trade.

Gaúcho and gaucho: comparative sócio-economic and demographic change in Rio Grande do Sul and Buenos Aires Province, 1869-1920

Cambios socioeconómícos y demográfícos muy complejos transformaron las sociedades rurales de Rio Grande de Sul y Ia provincia de Buenos Aires durante los anos 1869 a 1920. 10s estancíeros argentinos gozaban de mas poder político en el nivel nacional que los riograndenses - una diferencia central gu~ influía basicamente el desarrollo económico rural de Ias dos regiones. Pero Ias dos sociedades pastorales mostraban semejanzas de cultura, tenencia de Ia tierra, migración, y cambios demográficos durante esa época de modernización econômica. La teoria de Ia trangícíón demográfica ofrece un instrumento útil de interpretar esos cambios. :EI ensayo aplica Ia teoria con una metodologia comparativa utilizando una base de datos censales de 1869 a 1920;

Response ofDrosophila pavani, Drosophila gaucha and their hybrids to larval biotic residues

Los productos de desecho larval de las especies neotropicalesDrosophila pavani, D. gaucha y sus hibridos esteriles, inhiben el desarrollo de las larvas deD. pavani y los hibridos. El desarrollo deD. gaucha es afectado solo por sus propios residuos metabolicos. La viabilidad mas baja se obtuvo cuando los preadultos se crian en medios alimenticios contaminados por sus propios desechos metabolicos.