caa a22 4500 606207791 CHVBK 20210128101018.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s00425-015-2368-3 doi (NATIONALLICENCE)springer-10.1007/s00425-015-2368-3 Differences in light-harvesting, acclimation to growth-light environment, and leaf structural development between Swedish and Italian ecotypes of Arabidopsis thaliana [Elektronische Daten] [Jared Stewart, William Adams III, Christopher Cohu, Stephanie Polutchko, Elizabeth Lombardi, Barbara Demmig-Adams] Main conclusion : Leaf morphological differences have an impact on light distribution within the leaf, photosynthesis, and photoprotection in Arabidopsis thaliana ecotypes from near the limits of this species' latitudinal distribution in Europe. Leaf morphology, photosynthesis, and photoprotection were characterized in two Arabidopsis ecotypes from near the limits of this species' latitudinal distribution in Europe (63°N and 42°N). The Swedish ecotype formed thicker leaves and upregulated photosynthesis more substantially than the Italian ecotype in high-light environments. Conversely, the smaller rosette formed, and lesser aboveground biomass accumulated, by the Swedish versus the Italian ecotype in low growth-light environments is consistent with a lesser shade tolerance of the Swedish ecotype. The response of the thinner leaves of the Italian ecotype to evenly spaced daily periods of higher light against a background of otherwise non-fluctuating low light was to perform the same rate of photosynthesis with less chlorophyll, rather than exhibiting greater rates of photosynthesis. In contrast, the thicker leaves of the Swedish ecotype showed elevated photosynthetic performance in response to daily supplemental higher light periods in a low-light growth environment. These findings suggest significant self-shading in the lower depths of leaves of the Swedish ecotype by the chloroplasts residing in the upper portions of the leaf, resulting in a requirement for higher incident light to trigger photosynthetic upregulation in the lower portions of its thicker leaves. Conversely, photoprotective responses in the Italian ecotype suggest that more excess light penetrated into the lower depths of this ecotype's leaves. It is speculated that light absorption and the degree of utilization of this absorbed light inform cellular signaling networks that orchestrate leaf structural development, which, in turn, affects light distribution and the level of absorbed versus photosynthetically utilized light in a leaf. Springer-Verlag Berlin Heidelberg, 2015 Leaf thickness nationallicence Light response nationallicence NPQ nationallicence Photosynthesis nationallicence Tocopherol nationallicence Zeaxanthin nationallicence A : Antheraxanthin nationallicence CBF : C-repeat-binding factor nationallicence LMA : Leaf mass per area nationallicence NPQ : Non-photochemical quenching of chlorophyll fluorescence nationallicence P max : Photosynthetic capacity (light- and CO2-saturated rate of photosynthesis) nationallicence ROS : Reactive-oxygen species nationallicence V : Violaxanthin nationallicence VAZ : Xanthophyll cycle pigments violaxanthin, antheraxanthin, and zeaxanthin nationallicence Z : Zeaxanthin nationallicence Stewart Jared Department of Ecology and Evolutionary Biology, University of Colorado, 80309-0334, Boulder, CO, USA aut Adams III William Department of Ecology and Evolutionary Biology, University of Colorado, 80309-0334, Boulder, CO, USA aut Cohu Christopher Department of Ecology and Evolutionary Biology, University of Colorado, 80309-0334, Boulder, CO, USA aut Polutchko Stephanie Department of Ecology and Evolutionary Biology, University of Colorado, 80309-0334, Boulder, CO, USA aut Lombardi Elizabeth Department of Ecology and Evolutionary Biology, University of Colorado, 80309-0334, Boulder, CO, USA aut Demmig-Adams Barbara Department of Ecology and Evolutionary Biology, University of Colorado, 80309-0334, Boulder, CO, USA aut Planta Springer Berlin Heidelberg 242/6(2015-12-01), 1277-1290 0032-0935 242:6<1277 2015 242 425 https://doi.org/10.1007/s00425-015-2368-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00425-015-2368-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Stewart Jared Department of Ecology and Evolutionary Biology, University of Colorado, 80309-0334, Boulder, CO, USA aut NATIONALLICENCE 700 1- Adams III William Department of Ecology and Evolutionary Biology, University of Colorado, 80309-0334, Boulder, CO, USA aut NATIONALLICENCE 700 1- Cohu Christopher Department of Ecology and Evolutionary Biology, University of Colorado, 80309-0334, Boulder, CO, USA aut NATIONALLICENCE 700 1- Polutchko Stephanie Department of Ecology and Evolutionary Biology, University of Colorado, 80309-0334, Boulder, CO, USA aut NATIONALLICENCE 700 1- Lombardi Elizabeth Department of Ecology and Evolutionary Biology, University of Colorado, 80309-0334, Boulder, CO, USA aut NATIONALLICENCE 700 1- Demmig-Adams Barbara Department of Ecology and Evolutionary Biology, University of Colorado, 80309-0334, Boulder, CO, USA aut NATIONALLICENCE 773 0- Planta Springer Berlin Heidelberg 242/6(2015-12-01), 1277-1290 0032-0935 242:6<1277 2015 242 425