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Comparison between different selection indices in energy cane breeding

2017; Research Foundation of Ribeirão Preto; Volume: 16; Issue: 1 Linguagem: Inglês

10.4238/gmr16019535

1676-5680

Amaro Afonso Campos de Azeredo, Leonardo Lopes Bhering, Bruno Portela Brasileiro, Cosme Damião Cruz, Luís Cláudio Inácio da Silveira, Ricardo Augusto de Oliveira, João Carlos Bespalhok Filho, Edelclaiton Daros,

Biofuel production and bioconversion

Sugarcane breeding programs have been adapting to a new market demand: aside from high sucrose yield per hectare, the sector needs new cultivars with higher fiber percentages.The selection of sugarcane clones based on phenotype alone is a complex task.The selected clones should display high performance in a series of yieldand quality-related traits.Selection indices can provide information about which clones can best combine the traits of agronomic interest.In this study, different selection indices were evaluated in a population of 220 clones.The following traits were evaluated: weight of 10 stalks with straw, weight of 10 stalks with no straw, tons of cane per hectare with straw, tons of cane per hectare with no straw, sucrose content, fiber percentage, and tons of fiber per hectare.The selection indices of Smith (1936) andHazel (1943) and Mulamba and Mock (1978), the base index (Williams, 1962), and the index of Pesek and Baker (1969) were used.The selection index of Mulamba and Mock (1978) without economic weight estimates, the index of Mulamba and Mock A.A.C. de Azeredo et al.Genetics and Molecular Research 16 (1): gmr16019535with economic weights based on heritability, and the index of Pesek and Baker (1969) with the desired gains based on genetic standard deviations were efficient for the selection of energy cane clones with good fiber yield, sucrose content, and tons of cane per hectare.