Adh system and genetic background: Interaction with wing length in Drosophila melanogaster

Pieragostini, E.; Sangiorgi, Simonetta; Cavicchi, Sandro

doi:10.1007/bf00122045

Cited by 14 publications

(10 citation statements)

References 17 publications

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“…In two previous papers we suggested that the apparent selective responses at the Adh locus in Drosophila melanogaster are not independent either of the genetic background or of variation at the gene pool level brought about by changes of selection pressure (Pieragostini et al, 1979(Pieragostini et al, , 1981. Moreover notwithstanding different environmental temperatures and at variance with the findings of other authors (Pipkin et al, 1973;Johnson & Powell, 1974;Vigue & Johnson, 1973), we found that the Adh locus was not the target of selection.…”

Section: Introductioncontrasting

confidence: 56%

“…After the oviposition period, the 120 mothers were assayed for five quantitative characters (wing length and width, thorax length and width and head width) and for Adh genotype following the procedure detailed in Pieragostini et al, 1979. These 120 groups of data (5 metric traits and Adh genotype × each female) represent the last sample of the original population, to which we will refer as 30M.…”

Section: Methodsmentioning

confidence: 99%

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Mimicry of isozyme adaptive advantage by gene association II. Adh genotype frequency variations in Drosophila cage populations reared at different temperatures

et al. 1981

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The adaptive response of the Adh locus to different temperatures was determined in an experimental population with a stabilized gene pool in order to confirm the conclusions reached in a previous paper (Pieragostini et al., Genetica 56: 27-37, 1981) using as experimental material a laboratory population in which heterosis and strong interaction between loci were present.By sampling a stable lab population, three cage populations were constructed, heterozygous at the Adh locus and genetically identical but reared at different temperatures (P 18 ° C, P 25 ° C and P 28 o C). On these populations we studied the dynamics of Adh allele frequencies and of five metric traits up to the fifth generation of caging. The most interesting result is represented by the differences between P 28 °C and the other two populations (P 25 °C and P 18 °C). In particular P 25 °C and P 18 °C show a strong similarity with the original population both in Adh allele frequency and relationship between Adh genotype and the respective metric phenotype; this is not the case for P 28 o C which differed from the original population and the other two newly founded ones not only in Adh allele frequencies but even in gene arrangements.Comparing these results with those obtained in the previous work it can be concluded that Adh frequency variations can be a side effect of the evolutionary pattern of the populations which in turn depends on the initial genetic composition.

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Section: Introductioncontrasting

confidence: 56%

Section: Methodsmentioning

confidence: 99%

Mimicry of isozyme adaptive advantage by gene association II. Adh genotype frequency variations in Drosophila cage populations reared at different temperatures

et al. 1981

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“…(1) The present data refer to a cage population of Drosophila melanogaster obtained by crossing Canton strain 99 and Oregon strain ~(~ (see Pieragostini et al,, 1979 for details) and kept at 25 °C. Seventy QQ and 70 6'~ of the F l generation from the above cross were placed in a 15 × 20 × 30 em polymethylmetalcrylate box, having six holes in two rows on the two largest sides, where vials containing the culture media may be placed.…”

Section: Methodsmentioning

confidence: 99%

“…From the emerging progeny of the sample pairs, 100 virgin 9Q were taken and wing length and width, thorax length and width and head width, were measured (F_, wing length measures have already been reported in Pieragostini et al, 1979).…”

Section: Methodsmentioning

confidence: 99%

“…The classified Q9 were mated in single pairs with ~c~ randomly chosen from the same population. After oviposition in vials for two days, the mothers were analyzed electrophoretically to determine their A dh genotype (see Pieragostini et al, 1979 for detailed procedure). The frequency of each maternal Adh genotype was determined both in the whole original sample and in each wing length class, to test if A dh genotypes were randomly distributed with respect to this metric character.…”

Section: Methodsmentioning

confidence: 99%

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Mimicry of isozyme adaptive advantage by gene association I. Relationship between Adh genotypes and body dimension in Drosophila cage populations: A multivariate analysis

et al. 1981

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Experiments are described that are to prove that the apparent selective responses at the Adh locus in Drosophila melanogaster are not independent from its genetic background and from the variation at the gene pool level brought about by the changes of selection pressure. The dynamics of allozyme frequencies were observed at the Adh locus, of five metric traits and of reproductive fitness in two synthetic populations of Drosophila melanogaster originated from the same cross between Canton and Oregon strains, homozygotes for different Adh alleles and reared at different temperatures (25 °C and 28 ° C), until all above mentioned characters showed no more variations. The results obtained by univariate and multivariate statistical analyses can be summarized as follows:Adh s allele frequency keeps high and reaches very similar values in spite of the different environmental temperatures, whose selective effects at the Adh locus are therefore unlikely; both populations evolve toward the stabilization of Adh frequencies and other characters with a process strictly dependent on the permanence of coadapted blocks of genes which were contributed to the F 2 generation by the parental Canton and which are identified phenotypically by the association of AdhS/s with short wing; -at the stabilization point the flies classified on the basis of their Adh genotype exhibit different shapes, namely their metric phenotypes can be discriminated considering all the respective traits together by means of multivariate analyses.Owing to the presence in the initial populations of heterosis and epistatic interactions between loci, the observed differences between Adh genotype groups should represent the outcome of selection upon coadapted blocks of genes rather than on individual loci. Therefore, these results are argued as further evidence that each Adh genotype can be associated to different gene arrangements and its adaptive value cannot be isolated from that of its genetic background.

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Mating patterns of different Adh genotypes of Drosophila melanogaster I. Differences in mating ability

Prado

Lizana

1988

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The mating ability of the different Adh genotypes of D. melanogaster, from three natural populations, was estimated as the number of females inseminated by a single male in a 24-hour period. The data indicate that populations of D. melanogaster vary in mating properties, but a common tendency was found in all of them: the heterozygous individuals, especially the males, show a relative advantage with respect to homozygotes. On the other hand, our results suggest that the differences in mating patterns observed between populations may be correlated with the different degree of Adh polymorphism found in them.

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Adh system and genetic background: Interaction with wing length in Drosophila melanogaster

Cited by 14 publications

References 17 publications

Mimicry of isozyme adaptive advantage by gene association II. Adh genotype frequency variations in Drosophila cage populations reared at different temperatures

Mimicry of isozyme adaptive advantage by gene association II. Adh genotype frequency variations in Drosophila cage populations reared at different temperatures

Mimicry of isozyme adaptive advantage by gene association I. Relationship between Adh genotypes and body dimension in Drosophila cage populations: A multivariate analysis

Mating patterns of different Adh genotypes of Drosophila melanogaster I. Differences in mating ability

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