Avaliação de famílias de irmãos germanos de cana-de-açúcar da série RBO7 na fase inicial de seleção do melhoramento

Abstract

The objective of this study was to evaluate the performance of productiviti in sugarcane, richness in sugar and early maturation of families of series RB07 in stage T2 in sugarcane selection. With increasing international demand, present and future, the consumption of alcohol appears to Brazil an excellent opportunity to expand its presence in the international market. In plant breeding two sources of variation has been recognized, the variation between and within families. In the case of vegetatively propagated species such as cane sugar, the theory and experimental results have shown that these two sources of variation are of similar magnitude. This work was conducted in the crop year of 2008/2009 with sugarcane in the agricultural area of San Jose. The Plant experimental design adopted was a randomized block design with four replicates, and using ten treatments (families). Were evaluated in sugarcane, at the three-month-old plant for agricultural production the characters LNP, MHP and PNC; already in the twelfth month of age were also evaluated, besides these characters have been added MDC and MNCP; at the twelfth month the following characters NLP, MDC, CB, MWC, MNCP, CTH, CTeH and BTH. The presence of genetic variability among families from the cross of brother-german in sugarcane, found in this population allows you to select the best families based in production characteristics to make possible a strategy to be adopted in the early stages of selection in fase T2. In the study population there is the possibility for families selection from cross of brother-german for early maturing based on the Brix% cane (CB). The families selection in early fase of improvement of sugarcane is a strategy for identifying individuals with high genotypic values, with possibility of selecting clones potentially productive in CTH and BTH.