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叶绿体中镉含量的变化由光系统I的活性反映出来，而非光系统II。

Changes of Cd content in chloroplasts are mirrored by the activity of photosystem I, but not by photosystem II.

作者信息

Lysenko E A, Kusnetsov V V

机构信息

Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia.

出版信息

Photosynthetica. 2024 May 7;62(2):187-203. doi: 10.32615/ps.2024.018. eCollection 2024.

DOI:10.32615/ps.2024.018
PMID:39651413
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11613828/
Abstract

We searched for a direct Cd action on the photosynthetic electron transport chain using induced chlorophyll fluorescence and P light absorption. Young barley and maize plants were treated with Cd in concentrations of toxic (80 μM) and nearly lethal (250 μM). The maximal and relative photochemical activities of PSI, its major limitation at the donor side, and partially acceptor-side limitation of PSII changed in agreement with Cd accumulation in the corresponding chloroplasts. Acceptor-side limitation of PSII increased with a direct Cd action at 80 μM that was overcome with an indirect Cd action at 250 μM. These alterations can be explained by Cd/Cu substitution in plastocyanin. The photochemical and nonphotochemical quenching by PSII varied diversely which cannot be explained unambiguously by any mechanism. The limitations of PSI [Y, Y] and PSII (q) were compared for the first time. They were ranged: Y < q < Y.

摘要

我们利用诱导叶绿素荧光和P光吸收来探寻镉对光合电子传递链的直接作用。用毒性浓度（80μM）和接近致死浓度（250μM）的镉处理大麦和玉米幼苗。光系统I（PSI）的最大光化学活性和相对光化学活性、其在供体侧的主要限制以及光系统II（PSII）在部分受体侧的限制，与相应叶绿体中镉的积累情况一致地发生变化。在80μM镉的直接作用下，PSII受体侧的限制增加，而在250μM镉的间接作用下则得以克服。这些变化可以用质体蓝素中镉/铜的取代来解释。PSII的光化学猝灭和非光化学猝灭变化多样，无法用任何一种机制明确解释。首次比较了PSI的限制[Y，Y]和PSII的限制（q）。它们的范围是：Y < q < Y 。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/ee97bf010518/PS-62-2-62187-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/06202090e3f5/PS-62-2-62187-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/b286ac0a7546/PS-62-2-62187-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/81aae66051ee/PS-62-2-62187-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/23f5baa870af/PS-62-2-62187-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/ded68b9bcea0/PS-62-2-62187-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/f142f069d6eb/PS-62-2-62187-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/936c31de716b/PS-62-2-62187-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/ee97bf010518/PS-62-2-62187-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/06202090e3f5/PS-62-2-62187-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/b286ac0a7546/PS-62-2-62187-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/81aae66051ee/PS-62-2-62187-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/23f5baa870af/PS-62-2-62187-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/ded68b9bcea0/PS-62-2-62187-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/f142f069d6eb/PS-62-2-62187-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/936c31de716b/PS-62-2-62187-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0fbc/11613828/ee97bf010518/PS-62-2-62187-g008.jpg

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