Advanced

Antimycin A treatment decreasees respiratory internal rotenone-insensitive NADH oxidation capacity in potato leaves

Geisler, Daniela LU ; Johansson, Fredrik I LU ; Svensson, Staffan LU and Rasmusson, Allan LU (2004) In BMC Plant Biology 4(8). p.1-10
Abstract
Background

The plant respiratory chain contains several energy-dissipating enzymes, these being type II NAD(P)H dehydrogenases and the alternative oxidase, not present in mammals. The physiological functions of type II NAD(P)H dehydrogenases are largely unclear and little is known about their responses to stress. In this investigation, potato plants (Solanum tuberosum L., cv. Desiree) were sprayed with antimycin A, an inhibitor of the cytochrome pathway. Enzyme capacities of NAD(P)H dehydrogenases (EC 1.6.5.3) and the alternative oxidase were then analysed in isolated leaf mitochondria.



Results

We report a specific decrease in internal rotenone-insensitive NADH dehydrogenase capacity in mitochondria... (More)
Background

The plant respiratory chain contains several energy-dissipating enzymes, these being type II NAD(P)H dehydrogenases and the alternative oxidase, not present in mammals. The physiological functions of type II NAD(P)H dehydrogenases are largely unclear and little is known about their responses to stress. In this investigation, potato plants (Solanum tuberosum L., cv. Desiree) were sprayed with antimycin A, an inhibitor of the cytochrome pathway. Enzyme capacities of NAD(P)H dehydrogenases (EC 1.6.5.3) and the alternative oxidase were then analysed in isolated leaf mitochondria.



Results

We report a specific decrease in internal rotenone-insensitive NADH dehydrogenase capacity in mitochondria from antimycin A-treated leaves. External NADPH dehydrogenase and alternative oxidase capacities remained unaffected by the treatment. Western blotting revealed no change in protein abundance for two characterised NAD(P)H dehydrogenase homologues, NDA1 and NDB1, nor for two subunits of complex I. The alternative oxidase was at most only slightly increased. Transcript levels of nda1, as well as an expressed sequence tag derived from a previously uninvestigated closely related potato homologue, remained unchanged by the treatment. As compared to the daily rhythm-regulated nda1, the novel homologue displayed steady transcript levels over the time investigated.



Conclusions

The internal rotenone-insensitive NADH oxidation decreases after antimycin A treatment of potato leaves. However, the decrease is not due to changes in expression of known nda genes. One consequence of the lower NADH dehydrogenase capacity may be a stabilisation of the respiratory chain reduction level, should the overall capacity of the cytochrome and the alternative pathway be restricted. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
BMC Plant Biology
volume
4
issue
8
pages
1 - 10
publisher
BioMed Central
external identifiers
  • Scopus:2942532784
ISSN
1471-2229
DOI
10.1186/1471-2229-4-8
language
English
LU publication?
yes
id
b54715b2-8523-4fbd-8265-2ddb731a6486 (old id 631399)
date added to LUP
2007-12-10 14:50:46
date last changed
2016-10-13 04:42:43
@misc{b54715b2-8523-4fbd-8265-2ddb731a6486,
  abstract     = {Background<br/><br>
The plant respiratory chain contains several energy-dissipating enzymes, these being type II NAD(P)H dehydrogenases and the alternative oxidase, not present in mammals. The physiological functions of type II NAD(P)H dehydrogenases are largely unclear and little is known about their responses to stress. In this investigation, potato plants (Solanum tuberosum L., cv. Desiree) were sprayed with antimycin A, an inhibitor of the cytochrome pathway. Enzyme capacities of NAD(P)H dehydrogenases (EC 1.6.5.3) and the alternative oxidase were then analysed in isolated leaf mitochondria.<br/><br>
<br/><br>
Results<br/><br>
We report a specific decrease in internal rotenone-insensitive NADH dehydrogenase capacity in mitochondria from antimycin A-treated leaves. External NADPH dehydrogenase and alternative oxidase capacities remained unaffected by the treatment. Western blotting revealed no change in protein abundance for two characterised NAD(P)H dehydrogenase homologues, NDA1 and NDB1, nor for two subunits of complex I. The alternative oxidase was at most only slightly increased. Transcript levels of nda1, as well as an expressed sequence tag derived from a previously uninvestigated closely related potato homologue, remained unchanged by the treatment. As compared to the daily rhythm-regulated nda1, the novel homologue displayed steady transcript levels over the time investigated.<br/><br>
<br/><br>
Conclusions<br/><br>
The internal rotenone-insensitive NADH oxidation decreases after antimycin A treatment of potato leaves. However, the decrease is not due to changes in expression of known nda genes. One consequence of the lower NADH dehydrogenase capacity may be a stabilisation of the respiratory chain reduction level, should the overall capacity of the cytochrome and the alternative pathway be restricted.},
  author       = {Geisler, Daniela and Johansson, Fredrik I and Svensson, Staffan and Rasmusson, Allan},
  issn         = {1471-2229},
  language     = {eng},
  number       = {8},
  pages        = {1--10},
  publisher    = {ARRAY(0xb533cd0)},
  series       = {BMC Plant Biology},
  title        = {Antimycin A treatment decreasees respiratory internal rotenone-insensitive NADH oxidation capacity in potato leaves},
  url          = {http://dx.doi.org/10.1186/1471-2229-4-8},
  volume       = {4},
  year         = {2004},
}