Profiles of photosynthesis within red and green leaves of Quintinia serrata
Profiles of photosynthesis within red and green leaves of Quintinia serrata
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DOI：
10.1034/j.1399-3054.2002.1160116.x
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发表时间：
2002-09-01
影响因子：
6.4
通讯作者：
Clearwater, MJ
中科院分区：
文献类型：
--
作者：
Gould, KS;Vogelmann, TC;Clearwater, MJ
我们已经测量了光合作用在细胞，组织和整个叶片水平，了解花青素色素的光利用模式的作用。通过对锯缘昆丁尼亚红、绿色叶片切片的叶绿素荧光光谱分析表明，叶肉中的花色素苷限制了绿色光对最上部栅栏叶肉的吸收。当花色素苷也存在于上表皮时，分布进一步受到限制。位于青色滤光器下方的叶肉细胞呈现出耐荫细胞特有的光合特征。结果表明，在光饱和条件下，红色叶片的CO2同化减少了23%，并且相对于绿色叶片，红色叶片的光饱和阈值辐照度较低。红叶的光合特性与阴适应植物相当。
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.