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Photosynthetic Properties of Photosystem II in Arabidopsis thaliana Ipa1 Mutant
Author(s) -
Peng LianWei,
Guo JinKui,
Ma JinFang,
Chi Wei,
Zhang LiXin
Publication year - 2006
Publication title -
journal of integrative plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.734
H-Index - 83
eISSN - 1744-7909
pISSN - 1672-9072
DOI - 10.1111/j.1744-7909.2006.00385.x
Subject(s) - photosystem ii , mutant , chlorophyll fluorescence , photosynthesis , fluorescence , arabidopsis thaliana , photosynthetic reaction centre , wild type , photochemistry , chemistry , biophysics , photosystem , chlorophyll , electron transfer , biology , botany , biochemistry , physics , optics , gene
In a previous study, we characterized a high chlorophyll fluorescence Ipa1 mutant of Arabidopsis thaliana , in which approximately 20% photosystem (PS) II protein is accumulated. In the present study, analysis of fluorescence decay kinetics and thermoluminescence profiles demonstrated that the electron transfer reaction on either the donor or acceptor side of PSII remained largely unaffected in the Ipa1 mutant. In the mutant, maximal photochemical efficiency (F v /F m , where Fm is the maximum fluorescence yield and F v is variable fluorescence) decreased with increasing light intensity and remained almost unchanged in wild‐type plants under different light conditions. The F v /F m values also increased when mutant plants were transferred from standard growth light to low light conditions. Analysis of PSII protein accumulation further confirmed that the amount of PSII reaction center protein is correlated with changes in F v /F m in Ipa1 plants. Thus, the assembled PSII in the mutant was functional and also showed increased photosensitivity compared with wild‐type plants. (Managing editor: Ping He)