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Zbornik - Društvo genetičara Srbije

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16 ZBORNIK ABSTRAKATA III KONGRESA GENETIÈARA SRBIJE I-Usm-5<br />

Subotica, 30. novembar - 4. decembar 2004.<br />

ADAPTIVNOST ILI STABILNOST Amy-GENOTIPOVA Drosophila subobscura<br />

U USLOVIMA KONTINUIRANIH I NAGLIH PROMENA KONCENTRACIJE<br />

SKROBA U HRANLJIVOM MEDIJUMU<br />

Tatjana Saviæ 1 , Marina Stamenkoviæ-Radak 2 i M. Anðelkoviæ 1,2<br />

1<br />

Institut za biološka istraivanja «Siniša Stankoviæ», Beograd<br />

2<br />

Biološki fakultet, Univerziteta u Beogradu, Beograd<br />

Analizom fenotipske varijabilnosti Amy-genotipova Drosophila subobscura na razlièitim<br />

koncentracijama skroba, kao model-sistema, mogu se razmotriti oblici, pravci i efekti<br />

interakcije genotip/sredina. U našim istraivanjima analiziran je uticaj postepenih i<br />

naglih promena koncentracije skroba na specifiènu aktivnost – amilaze, duinu razviæa<br />

i preivljavanje kod jedinki Drosophila subobscura homozigotnih ili heterozigotnih za<br />

«spori» i «brzi» amilazni alel.<br />

Proseène vrednosti za specifiènu aktivnost - amilaze, duinu razviæa i preivljavanje u<br />

uslovima postepenih i naglih promena koncentracije skroba ukazuju na opštu proseènu<br />

genetièku varijabilnost fenotipova koji je pod znaèajnim uticajem sredine (razlièita<br />

koncentracija skroba) i posmatrane karakteristike su fenotipski plastiène. Norme reakcija<br />

za proseène vrednosti analiziranih karakteristika takoðe ukazuju na postojanje znaèajnog<br />

sredinskog uticaja, kao i da je u njihovoj osnovi genetièka varijabilnost jedinki<br />

Drosophila subobscura.<br />

Rezultati dobijeni na osnovu proseènih indeksa fenotipske plastiènosti za specifiènu<br />

aktivnosti -amilaze, duinu razviæa i preivljavanje navode na zakljuèak da jedinke<br />

Drosophila subobscura u svakoj sledeæoj generaciji, odnosno sa poveæanjem skroba u<br />

hranljivom supstratu, adaptabilno odgovaraju u pogledu preivljavanja, za razliku od<br />

specifiène aktivnosti -amilaze i duine razviæa èiji proseèni indeksi fenotipske<br />

plastiènosti ukazuju na stabilniji odgovor.<br />

ADAPTABILITY OR STABILITY OF Amy-GENOTYPES OF Drosophila<br />

subobscura IN DISCRETE AND IMMEDIATE CHANGES OF STARCH<br />

CONCENTRATIONS IN NUTRITIVE SUBSTRATE<br />

Through the analysis of phenotypic variability of Amy-genotypes of Drosophila<br />

subobscura on different starch concentrations, as a model-system, the shapes, directions<br />

and effects of genotype/environment interactions can be determined. Our research includes<br />

the study of the effect of discrete and immediate changes of starch concentrations<br />

on – amylase specific activity, development time and viability of Drosophila<br />

subobscura, homozygous or heterozygous for «slow» and «fast» amylase allele.<br />

The mean values of – amylase specific activity, development time and viability under<br />

discrete and immediate changes of starch concentrations, show that the overall genetic<br />

variability of phenotypes is under significant environmental influence (different starch<br />

concentrations) and that studied characters show phenotypic plasticity. Norms of reactions<br />

for the mean values of analyzed traits also point towards existence of significant environmental<br />

influence and individual genetic variability of Drosophila subobscura.<br />

The results obtained for the mean indices of phenotypic plasticity for - amylase specific<br />

activity, development time and viability, suggest that Drosophila subobscura flies,<br />

through each succeeding generation and increased starch concentrations in substrate,<br />

show adaptive response regarding viability, but their mean indices of phenotypic plasticity<br />

for development time and specific activity of the enzyme indicate the more stable response.

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