Evaluating sugarcane families by the method of Dynamic Technique for Order Preference by Similarity to Ideal Solution (DTOPSIS)

Abstract

Enlarging the quantity of seedlings of elite families and discarding inferior sugarcane (Saccharum spp.) families could improve sugarcane breeding and selection efficiency. The feasibility of using the method Dynamic Technique for Order Preference by Similarity to Ideal Solution (DTOPSIS) method was explored to identify superior sugarcane families. Data on 5 traits: Brix, millable stalks per stool (MS), stalk diameter (SD), plant height (PH), and percent pith were collected from two family trials having 17 families and two check cultivars at two sites including plant-cane and first-ratoon crops. The rest of the seedlings were planted into field for routine selection in the regular program. The DTOPSIS method calculates a comprehensive index (C i ) which expresses the closeness of a solution to the ideal solution and was used in this study to test the distance of each family to the ideal family. The C i of the families was compared to the family selection rate in the regular program by determining the selection rate at Stage 1 to Stage 4 for each family in the regular program. The result indicated that the C i values calculated from family trials were significantly (p<0.01) correlated to the selection rate at Stage 2 (r=0.8059), Stage3 (r=0.7967), and Stage 4 (r=0.8202), and indicating that promising clones were selected from families with higher C i values in the family trial. Thus, it could be feasible to use DTOPSIS to determine elite sugarcane families and to eliminate inferior families and thereby, increasing the variety selection efficiency.Key words: Dynamic Technique for Order Preference by Similarity to Ideal Solution (DTOPSIS), family selection, Saccharum officinarum L. Análise de famílias de cana-de-açúcar pelo método Dynamic Technique for Order Preference by Similarity to Ideal Solution (DTOPSIS)Resumo A elevação da quantidade de mudas de alta qualidade associada ao descarte das de baixa qualidade pode aprimorar os programas de seleção e melhoramento genético da cana-de-açúcar (Saccharum spp.). Este trabalho avaliou a capacidade do método Dynamic Technique for Order Preference by Similarity to Ideal Solution (DTOPSIS) de identificar famílias da cana-de-açúcar com elevada qualidade. As características avaliadas foram: Brix, aptidão para moagem, diâmetro do caule, altura e porcentagem de tecido parenquimatoso. Os dados foram coletados em dois experimentos com 17 famílias e duas cultivares incluindo cana soca e brota. O DTOPSIS estima o índice Ci que expressa a proximidade de uma solução particular à ideal. O Ci foi utilizado para avaliar a distância de cada família à família ideal. As demais mudas foram utilizadas em um programa tradicional de seleção. Os valores de Ci de cada família foram comparados às taxas de seleção de famílias obtidas pelo programa tradicional de seleção por meio da estimação das taxas de seleção nos estágios 1 a 4. Os resultados indicaram que os valores de Ci calculados a partir dos experimentos foram significativamente correlacionados (p<0,01) às taxas de seleção do está...