Avaliação econômica da cafeicultura adubada em Buritis, Rondônia, 2007.

O objetivo deste estudo foi avaliar o desempenho econômico de um sistema de produção de café convencional adubado no Município de Buritis, RO.bitstream/CPAF-RO-2010/14499/1/338-cafeiculturaemburitis.pd

Combining ability of elite clones of Eucalyptus grandisand Eucalyptus urophylla with Eucalyptus globulus.

In Brazil, eucalyptus breeding programs for cellulose production has used two species, Eucalyptus grandis and Eucalyptus urophylla. Nevertheless, it would be useful to introgress alleles from other species to improve wood quality and volume. The objective of this research was to evaluate the hybrid potential of elite clones of E. grandis and E. urophylla from the Aracruz Celulose Company S. A. with Eucalyptus globulus clones. To do so, six elite clones were crossed with ten E. globulus clones in a half-diallel mating design. The resulting hybrid combinations as well as the four check clones were evaluated in randomized complete block experiments with single plant plots and 40 replicates from September to October 2001 at three Brazilian sites, Aracruz and São Mateus in the Espírito Santo state and Caravelas in Bahia State. Two years later the circumference at breast height (CBH) and the wood density (WD) were measured. The means were submitted to diallel analysis according to the Griffing method (1956), adapted by Geraldi and Miranda Filho (1988). Although the number of clones involved was small, the crossings of elite clones of E. grandis and E. urophylla with clones of E. globulus were promising, especially for wood quality gains

Comparison between open pollinated progenies and hybrids performance in Eucalyptus grandis and Eucalyptus urophylla.

The cellulose industry in Brazil uses, mainly, hybrids between Eucalyptus grandis x E. urophylla. Not only the volume but also the wood density has great influence in the cellulose productivity, therefore a selection for both characteristics should be done as an alternative to increase the improvement program efficiency. The present work has been carried out with the objective of comparison between Open Pollinated progenies (OP) and hybrids performance in E. grandis and E. urophylla. To do so, 15 OP progenies of E. grandis, 15 OP progenies of E. urophylla, and 15 hybrids between E. grandis x E. urophylla, plus four controls were evaluated. The experiment was carried out from October to November 2001, in three sites, Aracruz and São Mateus, in the Espírito Santo State, and Caravelas, Bahia State, Brazil, in a 14 x 14 lattice design, involving the 49 treatments mentioned plus other progenies not considered in this article, with single tree plots and 40 replicates. Two years later the circumference at breast height (CBH) and the basic wood density (BWD) were evaluated. The hybrids performance for CBH was higher, an average, 38,7% than the OP progenies for both species. Part of the heterosis in relation to parental means could be attributed to the inbreeding depression due to selfing that occurred in the OP progenies and the dominance controlling this character. For the BWD the hybrids performance was the same of the OP progenies. Since there was divergence between the parents, it can be inferred that dominance has no importance for this trait. The negative correlation between the CBH and the BWD could impair the simultaneous selection for both traits, depending on the wood basic density range used by the industry

Variability of the 3' terminal of the polymerase gene of Grapevine leafroll-associated virus 3 isolates from Vale do São Francisco, Brazil.

Many viral diseases, including leafroll, which is of great economic importance, affect grapevines (Vitis spp.). Acomplex of eight viruses [Grapevine leafroll-associated virus (GLRaV)-1 to 8] is associated with this disease. The objectiveof this study was to compare the variability of the 3? terminal region of the polymerase gene of three isolates of GLRaV-3 (Grapevine leafroll-associated virus-3), from Submédio do Vale do Rio São Francisco (Petrolina-PE) with that of other isolates available at the GenBank, including an isolate from North America and another from Southern Brazil. The viral RNA was extracted from three infected ELISA reactive plants and a fragment of 340 bp was amplified, by RT-PCR, using primers that recognize that portion of the polymerase gene found between nucleotides 8267 and 8606. The three isolates from Vale do Rio São Francisco named Pet-1, Pet-2 and Pet-3, showed similarities ranging from 98% and 94%, respectively to the isolates from North America (AF037268) and Southern Brazilian (AF438411). Considering the whole genome, the main variation found was one amino acid change at position 2766 (F2766Y). These preliminary data indicate the existence of a natural variation among GLRaV-3 isolates from grapevines. This could be due to the vegetative propagation and long cycle of the plant, associated with the error-prone nature of RNA-dependent RNA polymerase

Diversidade genética de cultivares de mandioca com base em marcadores ISSR.

A mandioca (Manihot esculenta Crantz) é uma das culturas de grande importância por ser nativa do Brasil, ser cultivada em praticamente todo território nacional e fazer parte do consumo alimentar do brasileiro. O objetivo do trabalho foi estimar a variabilidade genética entre parentais elite de mandioca para serem usados no programa de melhoramento genético da Embrapa Mandioca que visa, além de variedades resistentes aos principais fatores bióticos e abióticos, a obtenção de variedades de mandioca com altos teores de β-caroteno; precursor da vitamina A. Vinte variedades elite de mandioca foram analisadas com nove primers ISSR que geraram 21 bandas polimórficas. Os marcadores ISSR foram capazes de separar as variedades em seis grupos que irão direcionar as estratégias a serem adotadas no programa de melhoramento da espécie

Taxa de reação acrossomica como indicador de fertilidade de touros.

O presente estudo tem por objetivo desenvolver e avaliar a eficiência da técnica de reação acrossomica em zebuínos como indicador do potencial de fertilidade de touros.Resumo expandido

Uso de marcadores SSR no estudo da diversidade genética entre cultivares de mandioca.

A mandioca (Manihot esculenta Crantz) é uma espécie nativa da América do Sul, que é altamente heterozigota e bastante adaptada às condições edafo-climáticas brasileiras. Os marcadores microssatélite, SSRs (Simple Sequence Repeats) "inter simple sequence repeats" (ISSR) são utilizados para estudar polimorfismos baseados em microssatélites. O objetivo do trabalho foi estudar a variabilidade genética entre parentais elite do programa de melhoramento genético da Embrapa Mandioca e Fruticultura, para validação da correlação entre a distância genética e heterose por meio de cruzamentos de variedades de mandioca com alta concentração de betacaroteno, precursor da vitamina A

Uso de marcadores ISSR na caracterização molecular de abacaxizeiro, para uso na produção de polímeros biodegradáveis.

As fibras naturais têm emergido como uma alternativa de baixo custo, pouco peso e com um apelo ambiental superior a outros materiais usados na indústria, substituindo, principalmente as fibras de vidro e gerando um impacto ambiental significativamente menor. A Embrapa Mandioca e Fruticultura possui um total de 670 acessos do gênero Ananas e outras bromeliáceas, sendo considerada a maior coleção de abacaxizeiro e espécies afins do mundo.Em paralelo aconteceram também os seguintes eventos: V Seminário de Pesquisa do Recôncavo da Bahia; V Seminário Estudantil de Pesquisa da UFRB; V Seminário da Pós-Graduação da UFRB; II Seminário Regional de Pesquisa da EBDA; 5ª Jornada Científica da Embrapa Mandioca e Fruticultura; VIII Seminário Estudantil de Pesquisa e Extensão da FAMAM; Semana de Ciência, Tecnologia e Inovação no Agronegócio; Fórum de Gestores de Iniciação Científica e Tecnológica da Bahia; II Simpósio Baiano de Defesa Agropecuária; I Semana de Educação Tutorial da UFRB