Uticaj abiotičkih stresora na stabilnost razvića i morfološku varijabilnost Iris pumila u prirodnim i eksperimentalnim populacijama
The influence of abiotic stressors on the development stability and morphological variability of Iris pumila in natural and experimental populations
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The main goal of thesis was to examine the influence of an abioticenvironmental factor, such as light intensity, on the developmentalstability level and morphological variability of I. pumila floral traits. Theindividuals, from natural habitat populations which located differentlight condition habitats (exposed and shaded one), as well as theindividuals of populations derived from natural habitat but raised inexperimental light conditions of low and high intensity, were used. Thebasic hypothesis was whether suboptimal light intensity decreaseddevelopmental stability of floral traits. Since the level of fluctuating andradial asymmetry is in negative correlation with developmental stability,but is positively correlated with developmental noise, the larger valuesof asymmetry index are to be expected in more stressful conditions. Thedevelopmental stability size and pattern of I. pumila floral traits differeddepending on analyzed trait, as well as on the evolutionary history ofanalyzed populations. The radial asymmetry index showed higheraverage values in shaded habitat comparing to the exposed one, meaningthat the exposed location is more stressful environment for developmentof the identical replicas of different floral organs. Populations derivedfrom open and shaded habitat differed in an average value of radialasymmetry index of floral traits inside each light intensity treatments,but didn’t differ in fluctuating asymmetry level.Statistically significantinteraction between treatment and population, that we got for the radialasymmetry of the standard length and all the indices of fluctuatingasymmetry, indicate that the effect of the light intensity on the sensitivityof developmental stability of Iris pumila floral traits depends on thepopulation origin: whether they originated from an open or a shadedhabitat. The actual light regimes in different habitats create statisticallysignificant differences in phenotypic and genetic correlation matrices’structures of morphological Iris pumila floral traits. The correlationmatrices of morphological Iris pumila floral traits coincided within andbetween populations derived from alternative light intensity treatments.
Keywords:Iris pumila; Radial asymmetry; Fluctuating asymmetry; Developmentalstability; Environmental stress; Correlation relationship between floral traits
Source:University of Belgrade, Faculty of Biology, 18-09-2009, 1-202
- Ova doktorska disertacija urađena je u Odeljenju za Evolucionu biologiju Instituta za biološka istraživanja ”Siniša Stanković” u Beogradu, u okviru projekta (broj 143033) „Fiziološki i evolucioni aspekti stresnog odgovora u prirodnim i laboratorijskim populacijama” Ministarstva za nauku i tehnološki razvoj Republike Srbije, a pod rukovodstvom mentora dr Branke Tucić i dr Zlatka Gibe.