Inhibition of photosynthetic oxygen evolution and electron transfer from the quinone acceptor QA− to QB by iron deficiency

被引：0
作者：
Najoua Msilini
Maha Zaghdoudi
Sridharan Govindachary
Mokhtar Lachaâl
Zeineb Ouerghi
Robert Carpentier
机构：
[1] Université du Québec à Trois-Rivièrs,Groupe de Recherche en Biologie Végétale (GRBV)
[2] Unité de Physiologie et de Biochimie de la Tolérance au Sel chez les Plantes,undefined
[3] Faculté des Sciences de Tunis,undefined
来源：
Photosynthesis Research | 2011年 / 107卷
关键词：
Iron deficiency; Electron transport; Photosystem II; Oxygen evolution; Fluorescence;
D O I：
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中图分类号：
学科分类号：
摘要：
The effect of iron deficiency on photosynthetic electron transport in Photosystem II (PS II) was studied in leaves and thylakoid membranes of lettuce (Lactuca sativa, Romaine variety) plants. PS II electron transport was characterized by oxygen evolution and chlorophyll fluorescence parameters. Iron deficiency in the culture medium was shown to affect water oxidation and the advancement of the S-states. A decrease of maximal quantum yield of PS II and an increase of fluorescence intensity at step J and I of OJIP kinetics were also observed. Thermoluminescence measurements revealed that charge recombination between the quinone acceptor of PS II, QB, and the S2 state of the Mn-cluster was strongly perturbed. Also the dark decay of Chl fluorescence after a single turnover white flash was greatly retarded indicating a slower rate of QA− reoxidation.
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页码：247 / 256
页数：9
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