Heterosis and combining ability of seed physiological quality traits of single cross vs. three-way sorghum hybrids

• Autor(a) principal: Galicia-Juárez, Marisol
• Data de Publicação: 2017
• Outros Autores: Mendoza-Onofre, Leopoldo Ernesto, González-Hernández, Víctor Arturo, Cisneros-López, María Eugenia, Benítez-Riquelme, Ignacio, Córdova-Téllez, Leobigildo
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Acta Scientiarum. Agronomy (Online)
• Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/31198
• topic: Sorghum bicolor L. Moench; maternal effects; seedling emergence; sorghum lines; top-cross tests.

The aim of this research was to compare genetic parameters for traits related with seed germination and seedling vigour of single cross (SCH) vs. three-way (TWH) sorghum hybrids. The study was conducted in a sand bed under a greenhouse; 67 genotypes (four pairs of A- and B- lines, four R- lines, 13 SCH and 42 TWH) were allocated in a randomized complete blocks experimental design with three replications. Statistical analysis included ANOVA’s and Student “t” tests, while Tukey test (p £ 0.05) was applied for mean comparisons. The R-lines showed better physiological seed quality attributes than the A- and B- lines. The seed quality and heterosis values of SCH vs. that of TWH did not show significant differences (p > 0.05) for any variable; however, heterobeltiosis of SCH was higher than that of TWY for normal seedlings, dry weight of plumule and seedling emergence rate. The A2- line and R14 restorer line showed the highest GCA values in both types of hybrids. No differences (p ≤ 0.05) were found between maternal and paternal effects of the A- and B- lines involved in the male sterile cross (female parent) of the TWH, except for plumule length in Line 5.