NDLI: Study of tobacco transformants to assess the role of chloroplastic NAD(P)H dehydrogenase in photoprotection of photosystems I and II

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Planta : Volume 216, Issue 1, November 2002

Study of tobacco transformants to assess the role of chloroplastic NAD(P)H dehydrogenase in photoprotection of photosystems I and II

Content Provider	Springer Nature Link
Author	Barth, Carina Krause, Heinrich G.
Copyright Year	2002
Abstract	Nicotiana tabacum L. wild-type plants and transformants (ΔndhCKJ), deficient in functional NAD(P)H dehydrogenase (NDH), were subjected to high light at 20 °C and 4 °C for 2 h to examine a possible role of NDH-mediated cyclic electron flow in protecting photosystems I and II from photoinhibition. Photochemical activity of photosystem I (PSI) was assessed by means of P700 absorbance changes at 810 nm. In addition, potential photosystem II (PSII) efficiency was determined by measuring the 'dark-adapted' ratio of variable to maximum chlorophyll fluorescence, F v/F m. Both photosystems were more susceptible to photoinhibition at 4 °C than at 20 °C. However, the degree of photoinhibition was not less in the wild type than in the NDH-deficient plants. To evaluate the efficiency of P700 oxidation in far-red light, a saturation constant, K s, was determined, representing the far-red irradiance at which half of the maximum P700 absorbance change was reached. In photoinhibited leaves, a decrease in the efficiency of P700 oxidation (increase in K s) was observed. The increase in K s was more pronounced at 4 °C than at 20 °C, but not significantly different between wild-type and ΔndhCKJ plants. Re-reduction kinetics of oxidised P700 in the dark were accelerated to a similar extent in photoinhibited samples of both genotypes and at the two temperatures tested. The data indicate that NDH-mediated cyclic electron flow does not protect PSI against short-term light stress. It is proposed that the observed increase in K s represents a protective mechanism that is based on accelerated charge recombination in PSI and facilitates thermal dissipation of excessive light energy.
Starting Page	273
Ending Page	279
Page Count	7
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	216
Issue Number	2
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-08-21
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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