NDLI: Alternative pathways of photosystem I-dependent electron transport in two genetically different potato cultivars in vitro

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Russian Journal of Plant Physiology : Volume 53, Issue 3, May 2006

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Alternative pathways of photosystem I-dependent electron transport in two genetically different potato cultivars in vitro

Content Provider	Springer Nature Link
Author	Deryabin, A. N. Sin’kevich, M. S. Bukhov, N. G. Truva, T. I.
Copyright Year	2006
Abstract	Alternative pathways of electron transport involving photosystem I (PSI) only were studied in leaves of potato plants (Solanum tuberosum L., cv. Desiree), modified by yeast invertase gene, controlled by tuber-specific class I patatin B33 promoter with proteinase II signal peptide for apoplastic localization of the enzyme. Nontransformed (wild-type) potato cultivar Desiree was used as a source of control plants. Phototrophic cultures grown in vitro on the sucrose-free Murashige and Skoog medium, as well as plants grown on the medium with 4% sucrose were examined. Various PSI-dependent alternative pathways of electron transport were discriminated by quantitative analysis of kinetic curves of dark reduction of P700$^{+}$, the primary electron donor of PSI, oxidized by far-red light known to excite selectively PSI. In potato plants with two different genotypes, four exponentially decaying kinetic components were found, which suggests the existence of multiple alternative routes for electron input to PSI. Inhibitor analysis (with diuron and antimycin A) allowed identification of each route. A minor ultra-fast component originated from weak residual excitation of PSII by far-red light and represented electron flow from PSII to PSI. Ferredoxin-dependent cyclic electron flow around PSI accounted for the middle component, and two slower components were assigned to donation of electrons to PSI from reductants localized in the chloroplast stroma. The rates of all components were somewhat higher in leaves of the transformed plants than in the wild-type plants. However, relative contributions of separate components to the kinetics of dark P700$^{+}$ reduction in leaves of both potato genotypes were similar. Growing plants on the medium with sucrose dramatically increased the amplitude of absorbance change at 830 nm in the transformed (but not in wild type) plants, which indicated a drastic increase in P700 concentration in their leaves.
Starting Page	431
Ending Page	438
Page Count	8
File Format	PDF
ISSN	10214437
Journal	Russian Journal of Plant Physiology
Volume Number	53
Issue Number	4
e-ISSN	16083407
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2006-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Solanum tuberosum alternative pathways of photosynthetic electron transport plants in vitro transgenic plants Plant Sciences Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Plant Science

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