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

Abstract

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 Aand 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.

Design I of Comstock and Robinson in the Emergence and Vigor of Sour Passion Fruit Seedlings

“…The significant difference between male parents (Table 2) shows that males have an effect on the expression of traits in the formed hybrids, being subject to selection. The selection of male parents favors heterotic effects, since Galicia-Juárez et al (2017) emphasize that the heterotic effects are expected to be maximized in single crosses depending on the genetic diversity of the parental. Evaluating female parents for all male parents (F/M -Table 2), it is concluded that female parents differed for all traits in at least one of the male parents.…”