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Nature vs nurture in the leaf morphology of Southern beech, Nothofagus cunninghamii (Nothofagaceae)
journal contribution
posted on 2023-05-16, 15:58 authored by Mark HovendenMark Hovenden, Vanderschoor, JKLeaf morphology varies predictably with altitude, and leaf morphological features have been used to estimate average temperatures from fossil leaves. The altitude-leaf morphology relationship is confounded by the two processes of acclimation and adaptation, which reflect environmental and genetic influences, respectively. Here we describe the relationship between altitude and leaf morphology for Southern beech, Nothofagus cunninghamii (Hook.) Oerst. Cuttings from several trees from each of four altitudes were grown in a common glasshouse experiment, and leaf morphology related to both genotype and altitude of origin. Genotype had a significant impact on leaf morphology, but in the field there was also a significant, overriding effect of altitude. This altitude effect disappeared in glasshouse-grown plants for all morphological variables other than leaf thickness and specific leaf area. These results show that, while leaf length, width and area are partially controlled by genetic factors, these variables are plastic and respond to environmental influences associated with a particular altitude. Thus altitudinal trends in leaf size in N. cunninghamii are unlikely to be the result of adaptation.
History
Publication title
New PhytologistVolume
161Pagination
585-594ISSN
0028-646XDepartment/School
School of Natural SciencesPublisher
Blackwell Publishing Ltd.Place of publication
United KingdomRepository Status
- Restricted