NDLI: Contribution of plastocyanin isoforms to photosynthesis and copper homeostasis in Arabidopsis thaliana grown at different copper regimes

Content Provider	Springer Nature Link
Author	Abdel Ghany, Salah Esmat
Copyright Year	2008
Abstract	In land plants plastocyanin is indispensable and therefore copper (Cu) availability is a prerequisite for growth. When Cu supply is limited, higher plants prioritize the Cu delivery to plastocyanin by down-regulation of other Cu proteins. Arabidopsis has two plastocyanin genes (PETE1 and PETE2). PETE2 is the predominant isoform in soil-grown plants and in hydroponic cultures it is accumulated in response to Cu addition. It functions as a Cu sink when more Cu is available, in addition to its role as an electron carrier. PETE1 is not affected by Cu feeding and it is the isoform that drives electron transport under Cu-deficiency. Cu feeding rescued the defect in photosystem II electron flux (ΦPSII) in the pete1 mutant whereas ΦPSII was not changed in the pete2 mutant as Cu was added. Plants with mutations in the plastocyanin genes had altered Cu homeostasis. The pete2 mutant accumulated more Cu/Zn superoxide dismutase (CSD2 and CSD1) and Cu chaperone (CCS) whereas the pete1 mutant accumulated less. On the other hand, less iron superoxide dismutase (FeSOD) and microRNA398b were observed in the pete2 mutant, whereas more were accumulated in the pete1 mutant. Our data suggest that plastocyanin isoforms are different in their response to Cu and the absence of either one changes the Cu homeostasis. Also a small amount of plastocyanin is enough to support efficient electron transport and more PETE2 is accumulated as more Cu is added, presumably, to buffer the excess Cu.
Starting Page	767
Ending Page	779
Page Count	13
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	229
Issue Number	4
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-12-16
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arabidopsis Copper homeostasis Plastocyanin isoforms Superoxide dismutase Ecology Forestry Agriculture Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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