Avaliação agroindustrial e parâmetros genético de progênies de cana-de-açúcar em fase inicial na zona canavieira do Litoral Norte de Pernambuco

Abstract

RESUMONeste trabalho, objetivou-se avaliar o desempenho agronômico, industrial e a magnitude dos parâmetros genético de progênies de cana-de-açúcar na zona canavieira do Litoral Norte de Pernambuco. Os experimentos foram desenvolvidos durante o ano agrícola 2006/2007 no Litoral Norte de Pernambuco, no município de Igarassu, dentro de área da Usina São José. O delineamento experimental foi de blocos casualizados, com cinco repetições, utilizando-se como tratamentos 24 genótipos (20 provenientes dos cruzamentos e quatro variedades padrões). A parcela constou de três sulcos de 6 m, espaçados de 1,30 m, com 10 plântulas por sulco, (espaçados de 0,6 m dentro do sulco, totalizando 30 plântulas por parcela), perfazendo uma área total de 23,4 m 2 . O corte foi realizado no décimo mês após o transplantio, onde foram avaliadas as seguintes variáveis: tonelada de cana por hectare (TCH), tonelada de pol por hectare (TPH), Fibra (FB), pol % corrigida (PCC), pureza (PZA), Brix (BX) e açúcar total recuperável (ATR). As progênies dos cruzamentos: RB855035 X RB 72454; RB 865230 X RB855035; Tuc71-7 X RB72454 e RB72454 X Tuc71-7, destacaram-se para as variáveis TPH, FB, PZA e BX. Há variabilidade genética entre as progênies dos cruzamentos para todas as variáveis avaliadas. As estimativas de h 2 m foram expressivas para as variáveis TPH, TCH, PCC, FB, BX e ATR, indicando a possibilidade de êxito na seleção dessas variáveis dentro da região canavieira do Litoral Norte de Pernambuco.Termos para indexação: Saccharum spp, seleção, variabilidade genética, herdabilidade. ABSTRACTThe objective of our research was to evaluate the agronomical, industrial performance and the magnitude of the genetic parameters of initial phase sugarcane progenies in the north coast of Pernambuco. Experimental works were developed during the agricultural year of 2006/2007 in the sugarcane plantation zone in the north coast of Pernambuco, in the district of Igarassu, in the area of the São José industrial plant. The experimental delineation was randomized blocks with five repetitions, using 24 genotypes as treatment (20 from the crossings and 4 standard varieties). The parcel was planted in three furrows of 6 m, spaced by 1.30 m with 10 seedlings per furrow (spaced by 0.6 m within the furrow), totalizing a total area of 23.4 m 2 . Harvest was done in the 10 th month after the transplantation, where were evaluated the following variables: pol tons per hectare (PTH), sugarcane tons per hectare (STH), fiber (FB), corrected pol % (CPP), purity (PTY), brix (BX) and total retrievable sugar (TRS). The progenies of the crossings: RB855035 X RB72454; RB865230 X RB855035; Tuc71-7 X RB 72454 and RB 72454X Tuc71-7, overtopped for most of the studied variables. There is genetical variability among the progenies of the crossings for all the evaluated variables. The h 2 m estimations were expressive for the variables STH, PTH, CPP, FB, BX and TRS, indicating the possibility of success in the selection of these variables within the sugarcane plantation region of North Coast ...

Research Article RESEARCH-ARTILE Agricultural performance and genetic parameters for yield-related traits of sugar- and energy cane families derived from planned crosses.

“…However, the coefficients of variation of TCH, TSH, and TFH were higher (32.59, 36.78, and 30.60%, respectively) ( Table 2). In studies with sugarcane families, Jackson et al (1995) and Moraes et al (2010) found similar values for these traits. In studies of energy cane families, Silveira et al (2016) found very similar values of CVe for the traits PC, FIB, TCH, TSH, and TFH to those obtained in this study.…”

“…For the yield-related traits TSH, TCH, and TFH, the values were high (20.15, 21.02, and 21.97%, respectively). In the studies of sugarcane families of Moraes et al (2010), the results of CVg for TCH and TSH were very similar (19.51 and 19.56%), and lower for FIB, BRIX, and PC (1.46 to 5.08%). Balsalobre et al (2016) reported very close values for BRIX, PC, and FIB, and lower values for the traits TCH and TSH.…”

Comparison of different selection methods in the seedling stage of sugarcane breeding

“…For TBH, CV g values on the order of 45.87 and 36.44% were obtained in studies conducted by Moraes et al. (2010), Oliveira et al. (2011), and Oliveira et al.…”

“…In agreement, Brasileiro (2013), Castro (2012), Moraes, Bastos, Filho, Melo, and Reis (2010), Oliveira, Daros, and Filho (2008), and Lucius, Oliveira, Daros, Filho, and Verissimo (2014) studied efficiency and performance of family selection in sugarcane; in all cases, the family selection method was superior to mass selection, in cases where the CV g values were on the order of 18 and 36% for TCH, respectively. For TBH, CV g values on the order of 45.87 and 36.44% were obtained in studies conducted by Moraes et al (2010), Oliveira et al (2011), and Oliveira et al (2013). Additionally, in a simulation study with a model of interaction between family and environment and in an analysis of total and family variance performed by Jackson, Bull, and McRae (1995), selection gains and superiority of family selection were reported in most cases.…”

Seleção de famílias e progênies de irmãos completos de cana-de-açúcar para atributos tecnológicos e de produção pelo método de REML/BLUP

“…No entanto, percebe-se que selecionando-se famílias sem considerar a variância genética dentro de cada cruzamento corre-se o risco de descartar indivíduos superiores em populações com médias inferiores, mas com ampla variabilidade e assimetria favorável na distribuição das progênies (Moraes et al, 2010). Oliveira et al (2008) afirmam que a seleção de famílias por meio de modelos mistos REMLP/BLUP pode ser uma estratégia importante para identificar famílias com elevados valores genotípicos, em que haveria maior probabilidade de seleção de clones potenciais.…”