STUDIES ON LIGHT-ABSORPTION AND PHOTOCHEMICAL ACTIVITY CHANGES IN CHLOROPLAST SUSPENSIONS AND LEAVES DUE TO LIGHT-SCATTERING AND LIGHT FILTRATION ACROSS CHLOROPLAST AND VEGETATION LAYERS
STUDIES ON LIGHT-ABSORPTION AND PHOTOCHEMICAL ACTIVITY CHANGES IN CHLOROPLAST SUSPENSIONS AND LEAVES DUE TO LIGHT-SCATTERING AND LIGHT FILTRATION ACROSS CHLOROPLAST AND VEGETATION LAYERS
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DOI：
10.1007/bf00034065
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发表时间：
1989-06-01
影响因子：
3.7
通讯作者：
JENNINGS, RC
中科院分区：
文献类型：
--
作者：
GARLASCHI, FM;ZUCCHELLI, G;JENNINGS, RC
实验分析了两个光系统对相对光吸收的影响，这两个光系统是由（a）高光散射环境（“迂回效应”）和（B）连续叶绿体层的光过滤（“光衰减效应”）引起的。采用分离的叶绿体和叶片的悬浮液。它的结论是，在一个单一的菠菜叶这些现象可能会导致只有相当小的增加相对光系统I的吸收和活性相对于光系统II，因此不会产生显着的影响，非循环电子传递。相反，当光穿过连续的植被层（阴影光）时，可能会遇到相对PSI吸收和活性的显着增加。已确定，来自多种植物的成熟叶中的“迂回效应”使总体光合有效光吸收增加35- 40%。
An experimental analysis is presented concerning the effect on relative light absorption by the two photosystems caused by (a) a highly light scattering environment (the "detour effect") and (b) light filtration across successive chloroplast layers (the "light attenuation effect"). Both suspensions of isolated chloroplasts and leaves were employed. It is concluded that within a single spinach leaf these phenomena are likely to lead to only rather small increases in relative photosystem I absorption and activity with respect to photosystem II and will thus not exert a significant effect on non cyclic electron transport. On the contrary when light is filtrated across successive vegetation layers (shade light) significant increases in the relative PSI absorption and activity may be encountered. It is determined that the "detour effect" in mature leaves from a variety of plants increases overall photosynthetically useful light absorption by 35-40%.