Genetic improvement of sunflower in Argentina between 1930 and 1995. I. Yield and its components

Pereira, Mónica López; Sadras, Víctor O.; Trápani, N.

doi:10.1016/s0378-4290(99)00015-5

Cited by 61 publications

(44 citation statements)

References 6 publications

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“…Thus, the present results are what were expected by sunflower breeders, but contrast with results of Lopez-Pereira et al [13] in Argentina, who observed an improvement of 23% for seed yield between open pollinated varieties and hybrids but no difference between sunflower hybrids released between 1983 and 1998. The eight hybrids these authors studied may have been a rather small sample to judge changes in many characters, as they did observe improved disease resistance.…”

Section: Discussioncontrasting

confidence: 99%

30 years of sunflower breeding in France

Vear¹,

Bony²,

Joubert³

et al. 2003

OCL

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Résumé :Les rendements et les résistances aux maladies de 4 groupes de 5 variétés de tournesol correspondant aux génotypes les plus cultivés en France depuis 1965 ont été comparés sur deux années d'expérimentation : 25 essais "rendements" et 7 essais "maladies". Les observations ont montré un gain moyen de rendement en grain de 40 % pour les 5 variétés cultivées après 1995 par rapport aux 5 variétés cultivées avant 1975, soit une progression moyenne de 33 kg/ha (ou 1,3 %) par an, avec une accélération marquée pour les dernières années. L'augmentation du rendement huilier (50 %) est essentiellement due, à partir de 1980, au gain de rendement en grain; en effet, la teneur en huile reste stable depuis cette date. Les niveaux de précocité et les tailles sont, en moyenne, les mêmes depuis 30 ans. Par contre les variétés actuelles sont nettement moins sensibles à la verse et aux maladies : réduction de la sensibilité à la verse de 80 %, aux attaques de Sclerotinia sur capitule de 60 % et de 30 % pour les attaques de Phomopsis sur tige. Pendant la première décennie, l'augmentation du rendement est liée à une forte augmentation du nombre de grains à l'hectare. Au contraire, nous observons une augmentation significative du poids de 1 000 grains durant la dernière décennie. Sept essais "rendement" ont été touchés par des attaques parasitaires non négligeables, ce qui a permis de montrer que 25 % de l'augmentation du rendement pouvait être expliqué par une augmentation de la résistance à Sclerotinia ou au phomopsis. Ce sont dans les conditions pédoclimatiques du Centre de la France qui donnent de forts potentiels de rendement mais des risques d'attaques parasitaires importants, que les variétés récentes expriment pleinement leur haut niveau de productivité. Les auteurs concluent que, dans un contexte d'une politique agricole soutenant cette espèce, les variétés modernes devraient être adaptées aux régions à fort rendement. Mots-clés :Helianthus annuus, hybride, rendement, résistance aux maladies, progrès génétique.

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Section: Discussioncontrasting

confidence: 99%

30 years of sunflower breeding in France

Vear¹,

Bony²,

Joubert³

et al. 2003

OCL

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“…To this effect, it seems to strategically be advisable that hybridization efforts in the future should give attention to building on the short coming of low yielding modern varieties like Monino with high yielding varieties like Arerti for simultaneous improvement of grain yield and hundred seed weight. Similarly, Pereira [29] reported that there was lack of increase in yield potential during the period 1930-1970 in sunflower. According to these authors, the importance of selection for disease tolerance and grain quality plus a reduced genetic base may have restrained selection for yield potential in sunflower.…”

Section: Grain Yield Potentialmentioning

confidence: 90%

Assessment of Genetic Improvement in Grain Yield Potential and Related Traits of Kabuli Type Chickpea (Cicer arietinum L.) Varieties in Ethiopia (1974-2009)

Baştaş¹,

Mekbib²,

Eshete³

2017

Adv Crop Sci Tech

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“…In particular:

The best genotypes are those that give a high priority to the harvested organs in the biomass partitioning. A large part of the genetic progress of several species has consisted of increasing HI (Lopez Pereira et al, 1999; Duvick, 2005).

In contrast, the efficiency of conversion of intercepted light into biomass is less variable between genotypes of a given species.

…”

Section: Variability Of Yield Depending On Light and Water Availabilitymentioning

confidence: 99%

“…A large part of the genetic progress of several species has consisted of increasing HI (Lopez Pereira et al, 1999; Duvick, 2005). …”

Section: Variability Of Yield Depending On Light and Water Availabilitymentioning

confidence: 99%

Plant response to environmental conditions: assessing potential production, water demand, and negative effects of water deficit

Tardieu¹

2013

Front. Physio.

159

100

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This paper reviews methods for analyzing plant performance and its genetic variability under a range of environmental conditions. Biomass accumulation is linked every day to available light in the photosynthetically active radiation (PAR) domain, multiplied by the proportion of light intercepted by plants and by the radiation use efficiency. Total biomass is cumulated over the duration of the considered phase (e.g., plant cycle or vegetative phase). These durations are essentially constant for a given genotype provided that time is corrected for temperature (thermal time). Several ways of expressing thermal time are reviewed. Two alternative equations are presented, based either on the effect of transpiration, or on yield components. Their comparative interests and drawbacks are discussed. The genetic variability of each term of considered equations affects yield under water deficit, via mechanisms at different scales of plant organization and time. The effect of any physiological mechanism on yield of stressed plants acts via one of these terms, although the link is not always straightforward. Finally, I propose practical ways to compare the productivity of genotypes in field environments, and a “minimum dataset” of environmental data and traits that should be recorded for that.

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Genetic improvement of sunflower in Argentina between 1930 and 1995. I. Yield and its components

Cited by 61 publications

References 6 publications

30 years of sunflower breeding in France

30 years of sunflower breeding in France

Assessment of Genetic Improvement in Grain Yield Potential and Related Traits of Kabuli Type Chickpea (Cicer arietinum L.) Varieties in Ethiopia (1974-2009)

Plant response to environmental conditions: assessing potential production, water demand, and negative effects of water deficit

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