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Enhanced Expression and Activation of the Alternative Oxidase
during Infection of Arabidopsis with
Pseudomonas
syringae pv tomato1
Bert H. Simons,
Frank F. Millenaar,
Lonneke Mulder,
Leendert C. Van
Loon, and
Hans Lambers*
Graduate School of Functional Ecology, Department of Plant Ecology
and Evolutionary Biology, Section of Plant Pathology (B.H.S., L.M.,
L.C.V.L.), and Section of Plant Ecophysiology (B.H.S., F.F.M., L.M.,
H.L.), Utrecht University, P.O. Box 800.84, 3508 TB Utrecht, The
Netherlands; and Utrecht University, P.O. Box 800.84, 3508 TB Utrecht, The
NetherlandsPlant Sciences, Faculty of Agriculture, The
University of Western Australia, Nedlands, WA 6009 Australia (H.L.)
Cyanide-resistant ("alternative")
respiration was studied in Arabidopsis during incompatible and
compatible infection with Pseudomonas syringae pv tomato
DC3000. Total leaf respiration increased as the leaves became necrotic,
as did the cyanide-resistant component that was sensitive to
salicylhydroxamic acid. Infiltration of leaves with an avirulent strain
rapidly induced alternative oxidase (AOX) mRNA, whereas the increase
was delayed in the compatible combination. The increase in mRNA
correlated with the increase in AOX protein. Increased expression was
confined to the infected leaves, in contrast to the
pathogenesis-related protein-1, which was induced systemically.
Virtually all of the AOX protein was in the reduced (high-activity)
form. Using transgenic NahG and mutant
npr1-1 and etr1-1 plants, we established
that the rapid induction of the AOX was associated with necrosis and
that ethylene, but not salicylic acid, was required for its induction.
Increased pyruvate levels in the infected leaves suggested that
increased substrate levels were respired through the alternative
pathway; however, in the control leaves and the infected leaves,
respiration was not inhibited by salicylhydroxamic acid alone.
Increased respiration appeared to be associated primarily with symptom
expression rather than resistance reactions.
1
This work was supported by grants from the
Netherlands Organization for Scientific Research.
*
Corresponding author; e-mail hlambers{at}cyllene.uwa.edu.au; fax
61-8-9380-1108.
Plant Physiol. (1999) 120: 529-538
Copyright Clearance Center: 0032-0889/99/120//10
© 1999 American Society of Plant Physiologists
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