Ontogenetska fenotipska plastičnost i materinski efekti tokom ranih stupnjeva razvića Iris pumila L. (Iridaceae)
Ontogenetic phenotypic plasticity and maternal effects during early stages of development in Iris pumila L.(Iridaceae)
Doctoral thesis (Published version)
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Study was about the size and patterns of phenotypicplasticity during the early stages of plant development inresponse to different light intensities, and the contribution ofmaternal factors expression of juvenile phenotype. For thisstudy two natural populations of I.pumila were chosen. Theywere exposed to different light conditions in Deliblato sands.The experimental design consisted of three light intensities.The three phases of the juvenile period I.pumila whereinvestigated. On each seedling a number of measurementswere taken. Based on the evaluation and comparison ofdifferent aspects of the variation of plant traits the followingconclusions were obtained: 1. The size and direction ofphenotypic responses were specific for the trait, as well asto the part of the light gradient. The results show that theplasticity of specific leaf area (SLA) is most pronounced inresponse to low light intensity; 2. Heritability and geneticcorrelation in I. pumila vary significantly between differentlight environments; 3. Phenotypic plasticity, measured bythe index of plasticity, was higher in plants from “Šuma”population; 4. Genotypes, as well as populations, ofI.pumila, have significantly different ontogenetic reactionnorms. The differences between the populationsdevelopmental pathways were lower in comparison with thedifferences between the light treatment; 5. Trait correlationssignificantly changed during development; 6. The coefficientof maternal effects (m2) and the coefficient of maternalvariation (CV) were trait-specific and treatment-specific. Theselective value of maternal genotype depends on theenvironment in which offspring development occurs; 7. Inthe early stages of development of I. pumila there was nosignificant ontogenetic variation of maternal effects. Thedegree of maternal effects decreased with seedlings age.Maternal correlations significantly change during ontogeny.These changes were environmentally dependent, too.
Keywords:Ontogenetic phenotypic plasticity; Maternal effects; Development Iris pumila
Source:University of Belgrade, Faculty of Biology, 2008, 1-129