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(二)光反应系统——光系统Ⅰ和光系统Ⅱ。光合作用是否只有一个光系统进行着一种光反应?早在四十年代就发现,在长波光中(大于680毫微米的红光),虽然叶绿素a大量吸收光能,但光合作用效率很低,这种在长波红光下,光合作用效率下降的现象称为红降现象。但是,如果在这种长波红光之外,再加上一些波长略短的红光(小于680毫微米),就使光合效率大增,比单独使用以上两种波长光的效率之和都高,这种现象称为双光增益效应。光合作用中的红降现象和双光增益效应如图6所示。红降现象和双光增益效应表明,光合作用至少包括
(b) Photoreactive systems - optical system I and optical system II. Does photosynthesis have only one light system performing a photoreaction? As early as in the 1940s, it was found that in long-wave light (red light greater than 680 nm), although chlorophyll a absorbs light energy in a large amount, the efficiency of photosynthesis is low. This phenomenon of reduced photosynthesis efficiency under longwave red light is known as redfall. However, if such long-wave red light is added, and some red light with a shorter wavelength (less than 680 nanometers) is added, the photosynthetic efficiency will be greatly increased, which is higher than the sum of the efficiency of using the above two wavelengths of light alone. This phenomenon is called the double light gain effect. The red drop phenomenon and double-beam gain effect in photosynthesis are shown in Figure 6. The red drop phenomenon and double-optical gain effect indicate that photosynthesis includes at least