Expression of Heterosis in Two Wheat Crosses¹

Plant density effect on expression of heterosis for yield and its components in wheat and F1 versus F3 yields

“…SCHMIDT et al (1962) used also two different plant densities, but these densities were confounded with environment (field versus greenhouse). BRIGGLE et al (1964) applied three densities per plot (=hill with hill spacing 30 x 30 cm). Per hill they grew 1 x 4 plants (one plant of each parent and two F, plants), 2 x 4 plants and 4 x 4 plants.…”

Une comparaison entre des blés hybrides produits par voie chimique et leurs parents : niveaux d'hétérosis et élaboration du rendement

“…This material has been evaluated in randomised complete block designs, the elementary plot surface being 4 m 2 . Globally, heterosis appears for yield (on average the 34 hybrids yield 3.1% more grain than their best-parent yield; and the best hybrid yields 7.3% more than the best line), biomass production, and 1 000 seed weight (fig 1, (Briggle et al, 1964;Akemine et Kumagai, 1966;Bitzer et (Briggle et al, 1964;Briggle et al, 1967;Planchon et Diehl, 1967;Jost et Hayward, 1980) (Rousset, 1986;Glenn, 1987 1978, 1980, 1981, 1982 et 1985, à (Nettevich, 1968;Jost et Hayward, 1980 (Bingham, 1983;Lucken, 1986;LefortBuson, 1986;Rousset, 1986) (1987,1988 (Triboi et al, 1985;Triboi, 1986 (Borghi et al, 1988), 7,3% pour 17 hybrides (Brears et al, 1988), 5,9% et 3,6% pour respectivement 61 et 430 hybrides (Morgan et al, 1989 …”

Effect of plant density and nitrogen on wheat F1 hybrids and their parents

“…found no effect of seed rate on heterosis. Briggle, Daum & Stevens (1964), and Barabas, Sagi & KertCsz (1973) found that heterosis increased at higher seed rates, at least in specific crosses. Despite the importance of nitrogen in determining crop yields, its effects on the expression of heterosis have only been reported by Allen (1973).…”