RESUMO -Foram avaliadas a adaptabilidade e a estabilidade de genótipos de soja (Glycine max L.) segundo a metodologia clássica de Eberhart e Russell e a estabilidade dos mesmos genótipos pela metodologia não-paramétrica de Huhn. Os experimentos foram conduzidos no delineamento em blocos casualizados, com três repetições e com 30 tratamentos (genótipos de soja), durante três anos consecutivos. As parcelas experimentais foram constituídas por quatro linhas de cultivo, espaçadas de 0,50 m e com densidade de 25 plantas por metro linear. Como área útil, foram tomadas as linhas centrais, eliminando-se 0,5 m de cada extremidade. A comparação entre as metodologias foi efetuada considerando-se o caráter produção de grãos. Verificou-se correlação de posição significativa dos postos dos genótipos, entre o desvio da regressão e as duas medidas não-paramétricas de estabilidade, porém o mesmo não foi observado entre o coeficiente de regressão e as medidas não-paramétricas (S i (1) e S i (2) ). As medidas S i (1) e S i (2) mostraram-se quase que perfeitamente correlacionadas.Termos para indexação: Glycine max, estabilidade de genótipo. CORRELATION BETWEEN PARAMETRIC AND NON PARAMETRIC STABILITY MEASURES IN SOYBEANABSTRACT -The adaptability and the stability of soybean (Glycine max L.)genotypes were evaluated through the classical methodology of Eberhart and Russell and the stability was also evaluated through the non-parametric methodology of Huhn. The experiments were conducted in the completely randomized blocks with three replications and with 30 treatments (soybean genotypes) during three consecutive years. The experimental plots were constituted by four rows 0.50 m apart and with 25 plants per meter. Data were collected in the two central rows being eliminated 0.50 m in each edge. To compare the two methodologies the character grain yield was considered. Positive and significative rank correlation was observed between the regression deviations and the two non-parametric stability parameters (S i (1) and S i (2) ) for the three studied characteristcs. The parameters S i (1) e S i (2) were nearly perfectly correlated to each other.
Twenty-five Brazilian soybean cultivars were studied for susceptibility to four strains of Agrobacterium tumefaciens (C58, Ach5, Bo542 and A281) and for their ability to produce somatic embryos. Twelve plants of each cultivar were inoculated in a greenhouse at 4-6 weeks of age, using 12 inoculation sites per plant. The number of galls formed on plants were counted 8-10 weeks after inoculation. To study ability to produce somatic embryos, immature cotyledons, 4-6 mm in length, were plated onto N10 medium for induction of somatic embryogenesis, using four Petri dishes with 20 cotyledons for each cultivar. The embryogenic tissues were transferred onto new N10 medium six times at 15-day intervals and the number of somatic embryos per cultivar determined. Significant interaction between soybean cultivars and A. tumefaciens strains was observed; the most virulent strain was A281. The opine type apparently had no effect on strain virulence, and the most embryogenic cultivars were IAS-5, Cristalina, FT-Cometa, IAC-7 and OC-3.
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