THE NONPHOTOCHEMICAL REDUCTION OF PLASTOQUINONE IN LEAVES
THE NONPHOTOCHEMICAL REDUCTION OF PLASTOQUINONE IN LEAVES
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DOI：
10.1007/bf00033039
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发表时间：
1993-06-01
影响因子：
3.7
通讯作者：
ORT, DR
中科院分区：
文献类型：
--
作者：
GROOM, QJ;KRAMER, DM;ORT, DR
虽然一般认为高等植物叶片中类囊体膜的质体醌库在变暗时迅速氧化，但情况往往并非如此。采用多闪动态荧光仪对叶片中质体醌库的氧化还原状态进行了监测。人们发现，在许多植物物种中，特别是那些使用NAD-苹果酸酶C4系统进行光合作用的植物，在从亮到暗的过渡之后，池实际上变得更加减少。在一些苋属物种中，质体醌在黑暗中保持还原数小时。远红光，这优先驱动光系统I的周转，可以有效地氧化质体醌库。当去除远红光照明时，质体醌在黑暗中在几秒钟内重新还原。质体醌池的暗还原的潜在机制仍然不确定，但可能涉及氯呼吸活性。
Although it is generally assumed that the plastoquinone pool of thylakoid membranes in leaves of higher plants is rapidly oxidized upon darkening, this is often not the case. A multiflash kinetic fluorimeter was used to monitor the redox state of the plastoquinone pool in leaves. It was found that in many species of plants, particularly those using the NAD-malic enzyme C4 system of photosynthesis, the pool actually became more reduced following a light to dark transition. In some Amaranthus species, plastoquinone remained reduced in the dark for several hours. Far red light, which preferentially drives Photosystem I turnover, could effectively oxidize the plastoquinone pool. Plastoquinone was re-reduced in the dark within a few seconds when far red illumination was removed. The underlying mechanism of the dark reduction of the plastoquinone pool is still uncertain but may involve chlororespiratory activity.