Seleção de progênies de cruzamentos entre Saccharum spontaneum e cana-de-açúcar para produção de bioenergia

For a few years now, it has been discussed and exposed the need of energy generation through renewable, low-polluting sources that might be able to attend to the high demand for fuel, which is constantly growing. With the purpose of aiding in this matter, it was intended to identify genotypes with superior biomass production for energy production, descending from three crossbreeds between sugarcane commercial cultivars and genotypes from Saccharum spontaneum. Three crossbreeds were used, being one biparental crossbreed named Family 5002 (RB855465 x GLAGAH) and two polycrosses named Family 5006 (NG26011 x ?) and Family 5008 (SE5069 x ?). The seedlings provided to the IAC (Instituto Agronômico de Campinas - Agronomic Institute of Campinas) were transplanted in April 5th 2011 from the Sugar Cane Center in Ribeirao Preto/SP. It was used the augmented block design, with 9 blocks of 3 portions each, each portion having 5 lines of 10 plants each, totalizing 1350 plants. The spacing used was 1.5 x 1.5 m (between plants and lines). As standard cultivars, were used 5 commercial cultivars (IACSP95-5000, IACSP95-5094, IAC91-1099, IACSP93-3046 and IACSP94-2101). The harvest of each plant was performed 10 months after plantation and the ratoon cane 7 months after the first cut. Were evaluated characteristics regarding biometry, production and technological analyzes, and also mass phenotypic selection of subjects with better bioenergetics profile and correlation between the attributes. In the comparison between the medium of families and standard crossbreeds, a significant difference was noted, except the Family 5008 which wasn't different from the cultivars. From the 326 progenies chosen during the mass selection, 245 were from Family 5002, 19 from Family 5008 and 62 from the Family 5006. The selection by statistic analysis, via mixed models, the predicted genotypic productivity of the 30 superior progenies varied from 176.70 to 221.31 . ; Há alguns anos se tem falado e mostrado a necessidade de geração de energia através de ...