An evaluation of F₁ hybrid winter wheat genotypes produced using a chemical hybridizing agent

Abstract

SummaryIn experiments harvested in 1985 and 1986 the grain yields of 61 F1 hybrids among winter wheat varieties and advanced breeding lines were 5·9% greater than the yields of the best parents. In a trial with 430 hybrids in 1986, the hybrids yielded 3·6% more grain than the best parents. Among these 430 hybrids heterosis for yield was greatest for those from the lowest yielding parents. This result is taken to indicate that among these genotypes most genes for high yield have been fixed in the highest yielding parents.The hybrids had slightly fewer ears/m2, but more grains per ear and heavier grains than the highest yielding parents. They yielded more straw as well as more grain.The results are compared with those from other studies and it is concluded that yield advantage of F1 hybrids so far tested is not generally sufficient to justify their introduction into U.K. agriculture.

Étude multilocale de blés hybrides : niveaux d'hétérosis et élaboration du rendement

“…Ces derniers permettent en effet de produire de nombreuses combinaisons à partir des meilleures variétés du moment (Borghi et al, 1989;Morgan et al, 1989), sans les inconvé-nients liés à l'utilisation de la stérilité mâle géno-cytoplasmique (Rousset, 1986;Glenn, 1987 (1987,1988 (Auriau et al, 1979;Bingham, 1983;Lucken, 1986;Rousset, 1986) …”

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 …”

Distância genética e sua associação com heterose e desempenho de híbridos em aveia

“…A heterose para CV foi negativa em todos os cruzamentos, tendo variado de -5,2 a -0,6%; entretanto, quando o CV foi comparado ao melhor genitor (heterobeltiose), mostrou que, para pelo menos um cruzamento, foi mais elevado que o do genitor mais precoce. O CV, seguido pelo CR, exibiu baixa heterose e pequena amplitude de variação de heterose, o que indica que os genes que controlam estes dois caracteres são similares nos diferentes genótipos, e não ocorre distribuição de alelos dominantes entre eles, conforme sugerem Morgan et al (1989).…”