F1 hybrid versus 32 selected F7 lines performance of common winter wheat (Triticum aestivum ssp. vulgare)

Abstract

One F1 common wheat hybrid ('Zlatna Dolina' x 'Primépi') which had exhibited significant heterosis in a previous study was compared with 32 F7 lines selected from the same cross. The yield test was planted in the 1976-1977 season at two locations: Zagreb, Yugoslavia (optimal environment) and Hutchinson, Kansas, USA (stress environment). The purpose of this experiment was to determine if a homozygous segregant superior to the F1 hybrid could be obtained from the same cross combination.Heading date, plant height, disease incidence, grain yield and its components, protein content, and sedimentation value were examined at Zagreb. Germination, winterhardiness and grain yield were determined at Hutchinson.At Zagreb, the F1 hybrid exhibited significant heterosis in grain yield, even though two of the three yield components were intermediate to parent values. Heterotic effects were greater in the stress environment (Hutchinson), mainly due to the poor winterhardiness and lower yield of one parent variety. At Zagreb, grain yield of the f1 hybrid was significantly better than the best F7 line. However at Hutchinson, the two leading F7 Unes outyielded the f1 hybrid, but differences were not significant.It can be concluded that genes involved in heterosis in the hybrid, 'Zlatna Dolina' x 'Primépi', were not fixed in the homozygous lines selected from the same cross.

Agronomic and qualitative characteristics of ten bread wheat hybrids produced using a chemical hybridizing agent

“…Where more comprehensive studies on heterosis in wheat have taken place, it has been concluded that the best hybrids can outyield the leading varieties, but the yield advantage may not be commercially exploitable (Johnson, 1977(Johnson, , 1978 . In Yugoslavia the best hybrid selected in a twelve-parent diallel cross, grown as spaced plant over a period of four years, showed a 32% heterosis in GY per plant (Jost & Hayward, 1980 Edwards et al ., (1980) found yield advantage of 10-14% above the leading standard cultivar . However, this estimate was obtained at a very low mean yield level (28 .81 q/ha) .…”

Heterosis for yield and related characters in pea

“…Similarly, the levels of heterosis for wheat yield under stress conditions such as low fertility and late planting date were higher than those under non-stress condition such as high fertility and optimum planting date (Narula, 1984). It has been widely reported that levels of heterosis were influenced by the environments in which the hybrids were grown (Griffing & Zsiros, 1971;Gritton, 1975;Jolt & Hayward, 1980). The expression of heterosis was affected not only by natural factors but also by crop management such as plant density (Severson & Rasmusson, 1968;Uddin, 1991).…”

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 …”