This work was developed at Basic Scientific and Technological Unit of “Los Palacios” with the objective of evaluating the behavior of growth and yield of two sorghum varieties (Sorghum bicolor L. Moench) in Los Palacios town. The varieties Gilded ISIAP and CIAP 132 R were used, which were sowed in the sowing dates of December, 2009 and February, 2010. The technology of direct sowing was used and the cultural activities were developed according to that recommended by the Crop Technical Instructive. A Randomized complete experimental design with four replicas was used. The dry mass distribution of the air part and the leaf area index, in 10 plants for each parcel, every 15 days until the physiologic maturity, were evaluated. With these variables the dynamics of growth were established and the agricultural yield was determined, data that were processed by T Student, to 5 % of error probability. Considering the results it can be concluded that yields were influenced by sowing date and its biggest values were in correspondence with a bigger development of the leaf surface. Both varieties can be used in the town since their productive results exceed the values set in Cuba for sorghum crop

El trabajo se desarrolló en la Unidad Científica Tecnológica de Base “Los Palacios”, con el objetivo de evaluar el comportamiento del crecimiento y el rendimiento de dos cultivares de sorgo (Sorghum bicolor L. Moench) en la localidad de Los Palacios. Se emplearon los cultivares ISIAP Dorado y CIAP 132 R, los cuales se sembraron en las fechas de siembra diciembre, 2009, y febrero, 2010. Se empleó la tecnología de siembra directa y las actividades fitotécnicas se desarrollaron según lo recomendado por el Instructivo Técnico del Cultivo. El diseño experimental fue de bloques completamente aleatorizado con cuatro réplicas. Se evaluó la distribución de la masa seca de la parte aérea y el índice del área foliar en diez plantas por parcela, cada 15 días hasta la madurez fisiológica. Se estableció las dinámicas de crecimiento con dichas variables, se determinó el rendimiento agrícola, datos que fueron procesados mediante la prueba T Student al 5 % de probabilidad de error. Teniendo en cuenta los resultados se puede concluir que los rendimientos estuvieron influenciados por la fecha de siembra y los mayores valores del mismo estuvieron en correspondencia con un mayor desarrollo de la superficie foliar. Ambos cultivares pueden ser utilizados en la localidad ya que sus resultados productivos superan los valores que se establecen en Cuba para el cultivo del sorgo

A distribuição geográfica da abelha sem ferrão Melipona quadrifasciata quadrifasciata Lepeletier compreende desde o Rio Grande do Sul até Minas Gerais. O objetivo do presente estudo foi verificar a variabilidade genética em amostras de M. q. quadrifasciata coletadas na Região Sul do Brasil. Para tanto, 29 colônias de três localidades (Blumenau e Mafra/SC e Prudentópolis/PR) foram amostradas e a técnica de PCR-RFLP para o DNA mitocondrial foi utilizada. Sete regiões do genoma mitocondrial foram amplificadas e digeridas com 15 enzimas de restrição. Cinco haplótipos foram identificados: dois exclusivos das amostras de Prudentópolis e os outros três registrados nas amostras de Mafra e/ou de Blumenau.

The geographical distribution of the Brazilian endemic stingless bee Melipona quadrifasciata quadrifasciata Lepeletier ranges from Rio Grande do Sul to Minas Gerais states. The objective of the present study was to verify mtDNA polymorphisms among samples of M. q. quadrifasciata collected in southern Brazil. Twenty nine colonies from three localities (Blumenau and Mafra/SC and Prudentópolis/ PR) were sampled. Seven mtDNA regions were amplified and further digested with 15 restriction enzymes (PCR-RFLP). Five composite haplotypes were identified, with two unique to samples from Prudentópolis and the remaining three to samples from Mafra and/or Blumenau.