NDLI: Reaction norms of juvenile traits to light intensity inIris pumila (Iridaceae): A comparison of populations from exposed and shaded habitats

Content Provider	Springer Nature Link
Author	Pemac, Danijela Tucić, Branka
Copyright Year	1998
Abstract	Reaction norms were determined in two natural populations of the perennial plantIris pumila from contrasting light conditions at two levels of photosynthetically active radiation (105 and 35 µmol m−2s−1). Seedlings developed from free-pollinated seed families sampled individually from 19 and 12 randomly selected clonal genotypes in an exposed and a shaded population respectively, were grown in a growth room using a mixed model nested factorial experimental design and scored for a number of phenological and morphological traits. Ambient light conditions significantly affected all of the juvenile traits measured. In both populations, relatively convergent norms of reactions were revealed for leaf appearance dates, as well as for leaf number, suggesting the importance of these traits for functional adjustment to prevailing light conditions. Reaction norms for morphological traits, however, were largely nonparallel, but although often crossing each other, a significant family-by-treatment interaction in the ANCOVAs performed was not detected for any of the traits measured, indicating a small amount of genetic variation for plasticity in these populations. The extent of plastic response to light availability was determined and expressed as an index that estimates the percentage change in a trait value from a high to a low light level. Evolutionary and ecological implications of the observed plastic variations are also discussed.
Starting Page	159
Ending Page	176
Page Count	18
File Format	PDF
ISSN	03782697
Journal	Plant Systematics and Evolution
Volume Number	209
Issue Number	3-4
e-ISSN	16156110
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-01-01
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Iridaceae Iris pumila Reaction norms phenotypic plasticity genetic variation population differentiation light intensity Plant Ecology Plant Sciences Plant Anatomy/Development Plant Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Plant Science Ecology, Evolution, Behavior and Systematics

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