Profiles of photosynthesis within red and green leaves of Quintinia serrata |
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| Authors: | Gould Kevin S Vogelmann Thomas C Han Tao Clearwater Michael J |
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| Affiliation: | Plant Sciences Group, School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand; Botany Department, University of Wyoming, Laramie, WY 82071-3165, USA; Horticulture and Food Research Institute of New Zealand Ltd, Te Puke Research Centre, RD2 Te Puke, New Zealand; Present address: Botany and Agricultural Biochemistry, University of Vermont, Burlington, VT 05405-0086, USA |
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| Abstract: | We have measured photosynthesis at the cellular, tissue, and whole leaf levels to understand the role of anthocyanin pigments on patterns of light utilization. Profiles of chlorophyll fluorescence through sections of red and green leaves of Quintinia serrata showed that anthocyanins in the mesophyll restricted absorption of green light to the uppermost palisade mesophyll. The distribution was further restricted when anthocyanins were also present in the upper epidermis. Mesophyll cells located beneath a cyanic light-filter assumed the characteristic photosynthetic features of shade-adapted cells. As a result, red leaves showed a 23% reduction in CO2 assimilation under light-saturating conditions, and a lower threshold irradiance for light-saturation, relative to those of green leaves. The photosynthetic characteristics of red leaves are comparable to those of shade-acclimated plants. |
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