Gould Kevin S, Vogelmann Thomas C, Han Tao, Clearwater Michael J
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.
Physiol Plant. 2002 Sep;116(1):127-133. doi: 10.1034/j.1399-3054.2002.1160116.x.
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.
我们已在细胞、组织和整叶水平上测量了光合作用，以了解花青素色素在光利用模式中的作用。对锯齿昆士兰红叶和绿叶切片的叶绿素荧光分析表明，叶肉中的花青素将绿光吸收限制在最上层的栅栏叶肉。当上表皮也存在花青素时，这种分布会进一步受限。位于蓝色滤光层下方的叶肉细胞呈现出适应阴生环境细胞的典型光合特征。结果，与绿叶相比，红叶在光饱和条件下的二氧化碳同化量降低了23%，且光饱和的阈值辐照度更低。红叶的光合特性与适应阴生环境的植物相当。
