Action de la température et de la photopériode sur la production de formes sexuées par différents clones du puceron des céréales <i>Sitobion avenae</i>

Wegorek, P.; Dedryver, C. A.

doi:10.1111/j.1570-7458.1987.tb02259.x

Cited by 16 publications

(13 citation statements)

References 9 publications

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“…This small interclonal variability raises the question: 'Was it already at this level when the clones were collected, or did the long culture period have the effect of reducing it? ' Blackman (1979) demonstrated the stability of a certain number of characteristics in cultured clones over a long period of time, and we have also shown elsewhere (Wegorek & Dedryver, 1987) that this stability concerned sexual form production of these same clones of S. avenae.…”

Section: Discussion a N D C O N C L U S I O Nsupporting

confidence: 66%

The influence of clone and morph on the parameters of intrinsic rate of increase in the cereal aphids Sitobion avenae and Rhopalosiphum padi

Simon¹,

Dedryver²,

Pierre³

et al. 1991

Entomologia Exp Applicata

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This study aimed at evaluating the influence of intrinsic factors (clone, morph) on the parameters of the intrinsic rate of increase of Sitobion avenae (F.) and Rhopalosiphum padi (L.). For each species, apterous and alate exules of three clones originating from French oceanic regions were compared at 20 °C. The clonal factor had a significant effect on both time from birth until onset of reproduction (TBR) and intrinsic rate of increase (r). This effect was lower than that of the morph. Moreover, in the case of R. padi, a strong clone‐morph interaction was observed. Both apterous and alate morphs were shown to have a higher rate of increase in R. padi than in S. avenae. Various models were fitted to aphid daily rate of reproduction. Both types of model and quality of fit depended mainly on the morph. Résumé Les effets du clone et du morphe sur les paramètres du taux d'accroissement de deux espèces de pucerons des céréales, Sitobion avenae et Rhopalosiphum padi Cette étude a cu pour but d'évaluer l'importance de facteurs intrinsèques (clone et morphe) sur les paramètres du taux d'accroissement de Sitobion avenae (F.) et Rhopalosiphum padi (L.). Pour chaque espèce, trois clones originaires de regions océaniques françaises ont été comparés à 20 °C pour les morphes exules ailés et exules aptères. L'effet du clone est significatif sur l'âge reproducteur (durée comprise entre la naissance du puceron et le début de sa phase de reproduction) et sur le taux intrinsèque d'accroissement naturel. Il est plus faible que celui du morphe avec lequel il intéragit dans le cas de R. padi. Les différences interspécifiques relevées mettent en evidence les capacités d'accroissement supérieures de R. padi par rapport à celles de S. avenae, dans le cas des ailés comme dans celui des aptères. Enfin, différents modèles ont été appliqués aux données de reproduction journalière des pucerons. Le type et la qualité des ajustements varient essentiellement en fonction du morphe.

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Section: Discussion a N D C O N C L U S I O Nsupporting

confidence: 66%

The influence of clone and morph on the parameters of intrinsic rate of increase in the cereal aphids Sitobion avenae and Rhopalosiphum padi

Simon¹,

Dedryver²,

Pierre³

et al. 1991

Entomologia Exp Applicata

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“…The variety in the responses of different holocyclic S. avenae clones to short day/low temperature conditions have been attributed to the biological plasticity of the species (WEGOREK and DEDRYVER 1987). The results of the present study support this opinion.…”

supporting

confidence: 82%

Overwintering and hymenopterous parasitism in autumn of the cereal aphid Sitobion avenae (F.) in northern FR Germany

Höller

1990

J Applied Entomology

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Of 146 Sitobion awenae (F.) clones,' collected in the surroundings of Kiel (Schleswig-Holstein, northern FRG) and exposed to artificial short day/low temperature conditions, 73 YO proved to be holocyclic, 3 YO paracyclic, 4 Yo androcyclic and 20 YO anholocyclic. The relative amount of anholocycly differed between years (1985-87) and seasons: clones sampled in autumn showed a hi her anholocyclic response than summer clones. Survival of anholocyclic S. awenae under outfoor conditions succeeded only during the mild winter 1987188.High degrees of primary parasitism were recorded from S. awenae collected in volunteer cereals and early-sown winter barley fields between late summer and late autumn, whereas secondary parasitism remained unimportant. Aphidius picipes (Nees) was the dominant primary parasitoid, but other species of the same genus were also common. Aphidius spp. successfully parasitized both oviparae and males. Primary parasitoids are considered to affect greatly the initial reproductive unit of S. avenue.

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“…As outlined above, this regional subdivision probably results from selection for mode of reproduction by differential winter survival rather than from limited dispersal and consequent restricted gene flow. Indeed, lineages of S. avenae producing sexuals are able to overwinter as cold‐resistant eggs, while anholocyclics are eliminated in cold climates (Wegorek & Dedryver 1987). In our study, all aphids were collected in early spring when life cycle differences among regions should not have been eroded by migration.…”

Section: Discussionmentioning

confidence: 99%

Reproductive mode and population genetic structure of the cereal aphid Sitobion avenae studied using phenotypic and microsatellite markers

Simon¹,

Baumann²,

et al. 1999

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As French populations of the aphid Sitobion avenae exhibit a range of reproductive modes, this species provides a good opportunity for studying the evolution of breeding system variation. The present analysis combined ecological and genetic investigations into the spatial distribution of variation in reproductive mode. Reproductive mode was characterized in 277 lineages of S. avenae from France, and these aphids were scored for five microsatellite loci. The analyses revealed strong geographical partitioning of breeding systems, with obligate asexuals mostly restricted to the south of France, while lineages producing sexual forms were more common in the north. Contrary to what might be anticipated for organisms with frequent parthenogenesis, there was substantial genic and genotypic diversity, even in the obligately asexual lineages. More than 120 different genotypes were detected among the 277 aphid lineages, with an average of 5.9 alleles per locus (range four to 16) and heterozygosity of 56.7%. As with previous studies of allozyme variation in aphids, most loci showed heterozygote deficits, and disequilibrium was common among allelic variants at different loci, even after removal of replicate copies of genotypes that might have been derived through clonal reproduction. Our results suggest that selection is important in structuring reproductive systems and genetic variation in French S. avenae. Canonical correspondence analysis was employed to examine the associations between genotypic and phenotypic variables, enabling the identification of alleles correlated with life-history traits.

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Action de la température et de la photopériode sur la production de formes sexuées par différents clones du puceron des céréales Sitobion avenae

Cited by 16 publications

References 9 publications

The influence of clone and morph on the parameters of intrinsic rate of increase in the cereal aphids Sitobion avenae and Rhopalosiphum padi

The influence of clone and morph on the parameters of intrinsic rate of increase in the cereal aphids Sitobion avenae and Rhopalosiphum padi

Overwintering and hymenopterous parasitism in autumn of the cereal aphid Sitobion avenae (F.) in northern FR Germany

Reproductive mode and population genetic structure of the cereal aphid Sitobion avenae studied using phenotypic and microsatellite markers

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