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

Oury, François-Xavier; Koenig, Jean; Bérard, Pierre; Rousset, M.

doi:10.1051/agro:19900404

Cited by 8 publications

(9 citation statements)

References 6 publications

(6 reference statements)

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“…The data did not support enhanced performance at N0 of the hybrids over the parents. Values reported here for mid‐parent heterosis are in accordance to previous data obtained in replicated plot trials at high N level sown at normal seeding rates (Borghi et al, 1988; Morgan et al, 1989; Oury et al, 1990a,b). Oury et al (1994) found best‐parent heterosis ranging from −1.9 to 7.9% for grain yield and from −8.0 to 5.5% for grain N yield in an experiment carried out at seven locations.…”

Section: Resultssupporting

confidence: 90%

“…In plot trials conducted at normal seeding density, several authors have reported limited best‐parent heterosis for grain yield under high yielding conditions, e.g., +4.3% for 10 hybrids (Borghi et al, 1988), +7.3% for 17 hybrids (Brears et al, 1988), +3.6% for 430 hybrids (Morgan et al, 1989), +3.1% for 34 hybrids (Oury et al, 1990a), from −5.0% to +7.9% depending on the location for 33 hybrids (Oury et al, 1994). Concerning N deficiency, it was shown with a set of 10 hybrids grown at one location (Le Gouis and Pluchard, 1996) that best‐parent heterosis was higher at the low N level than at the high N level (9.9%* and 1.1% ns respectively).…”

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confidence: 99%

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Diallel Analysis of Winter Wheat at Two Nitrogen Levels

Gouis¹,

Béghin²,

Heumez³

et al. 2002

Crop Sci.

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Price reduction and environmental concerns advocate a lower use of nitrogen (N) fertilizer on the wheat (Triticum aestivum L.) crop. It is a common hypothesis that hybrids would be more valuable in stressed environments such as limited fertilizer conditions. The objective of this study was to assess heterosis and combining ability at two N levels. Seven winter wheat cultivars were used to produce a 7 × 7 diallel cross without the reciprocals. The 21 F1 hybrids and parental lines were tested in replicated plots over 2 yr without N fertilizer (N0) or with 150 kg N ha−1 (N+). The diallel analysis was conducted according to Griffing with year, genotype, and treatment as fixed effects. Mid‐parent heterosis for grain yield was +12.2%** at N0 and +8.9%** at N+ in 1997 and +1.7%ns at N0 and −0.4%ns at N+ in 1998. This was directly related to high mid‐parent heterosis for above‐ground dry weight in 1997 (+11.2%** at N0 and +10.9%** at N+) and low heterosis in 1998 (+1.2%ns at N0 and +0.0%ns at N+). General (GCA) and specific (SCA) combining ability effects were always significant. The GCA/SCA ratio ranged from 3.6 to 14.8. The GCA × N level interaction was generally significant indicating different parental contributions at low or high N levels. The SCA × N level interaction was never significant. There was a tendency toward higher GCA/SCA ratio at N0 than at N+. The choice of parents will be dependent upon the N level under which the new hybrids will be grown.

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Section: Resultssupporting

confidence: 90%

mentioning

confidence: 99%

Diallel Analysis of Winter Wheat at Two Nitrogen Levels

Gouis¹,

Béghin²,

Heumez³

et al. 2002

Crop Sci.

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“…Heterosis under suitable growing conditions was between 10.0 and 25.0% in barley (Scholz & Kunzel, 1987), 17-40% in wheat (Oury et al, 1990), and 12-18% in rapeseed (Lefort-Buson & Dattee, 1985). Among the variables linked to yield, be it the number of fruits per node or the weight of 100 beans, there did not appear to be any difference between the population of hybrids and the population of lines.…”

Section: Discussionmentioning

confidence: 99%

Coffea arabica hybrid performance for yield, fertility and bean weight

et al. 2005

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The performance of F1 hybrid plants derived from crosses between traditional varieties of Coffea arabica of Latin America with a "wild" collection of Sudan - Ethiopian origin were studied for yield, fertility and bean weight. Sudan Ethiopian material possesses resistance to certain diseases, and possibly, better beverage quality. The objective of this breeding programme is to widen the very narrow genetic base of Central American coffee, even while increasing quality and productivity. The hybrid plants were obtained from two factorial crosses made and evaluated in two locations. They were compared in the two field trials using the six maternal lines as controls. Observations were taken on vegetative characters, annual and cumulated yield, dry weight of 100 beans, extent of early abortion as measured by the fraction of 'peaberries' and post-zygotic ovule fertility as measured by the fraction of mature no-floating berries in water (FF). The F1 hybrid population were compared to the populations of maternal lines for the aforementioned variables. An index-based selection was done in the hybrid populations employing three traits, yield, 100-bean weight and the post-zygotic fertility ( FF). The performance of the selected hybrids was then compared to those of the best parental 'control' lines in each trial. The hybrid populations yielded 22 - 47% more than the maternal lines, but hybrids showed significantly more sterility than the parental control lines. Selection in the hybrid populations using the three selected traits led to significant genetic gain for yield and dry weight of 100 beans, and insignificant gain for fertility ( FF). When selected on the basis of fertility alone, increase in yield and 100-bean weight were not obtained within the hybrid populations. By applying selection on yield and 100-bean weight, the selected hybrids produced 11 - 47% higher yields than the best line along with significantly higher or identical 100-bean weight and performed identically for fertility. The yield performance of hybrids between the Latin American material and the "wild" Sudan - Ethiopian material calls for further selection effort for improving beverage quality

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“…(1990b) showed in an experiment carried out in 3 locations with 35 hybrid lines and their parents that on average best-parent heterosis was about 4% . Equivalent results were obtained on one location over 5 years and with 34 hybrid lines (Oury et al ., 1990a) . In official trials conducted in 1994 for registration, the better hybrid line outyielded the better pure line of only 250 kg/ha (Bernicot, 1995) .…”

Section: Hybrid Linesmentioning

confidence: 91%

Genetic variation for nitrogen use efficiency in winter wheat (Triticum aestivum L.)

Gouis

Pluchard

1996

Euphytica

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The new European Common Agricultural Policy and environmental considerations are certainly to change agricultural practices toward low input cultivation systems . Nitrogen is one of the main inputs of winter wheat in northern France and it contributes highly to phreatic water pollution . A research programme has then been set up in order to study whether it is possible to breed for winter wheat cultivars using more efficiently N fertilisers . Less nitrogen would be applied, decreasing pollution risks and operational costs. It has been shown that a large variation exists for N related traits and for the resistance against N deficiency . On the one hand the cv Arche is very resistant to N deficiency, its yield on low N conditions (with no N fertiliser) is on average 89% of its yield on high N conditions (with a high N application) . On the other hand, cv Recital is very susceptible to N deficiency as this same percentage is only 61 % . A study on 10 hybrids showed that heterosis for grain yield was higher at low N level than at high N level . This was due to a higher number of grains per m 2 .

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

Cited by 8 publications

References 6 publications

Diallel Analysis of Winter Wheat at Two Nitrogen Levels

Diallel Analysis of Winter Wheat at Two Nitrogen Levels

Coffea arabica hybrid performance for yield, fertility and bean weight

Genetic variation for nitrogen use efficiency in winter wheat (Triticum aestivum L.)

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