Salicylic Acid Levels in Arabidopsis Thaliana After Treatments With Pseudomonas Syringae or Synthetic Inducers

Summermatter, Kathrin; Meuwly, Ph.; Mölders, W.; Métraux, Jean‐Pierre

doi:10.17660/actahortic.1994.381.45

Cited by 10 publications

(9 citation statements)

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“…The increased expression of PR1a ( LSC94 ) in senescing leaves is modest when compared with the levels previously reported for this gene in response to pathogens or UV‐B, or in leaves sprayed with SA ( Hanfrey et al . 1996 ; Summermatter et al . 1994 ; Surplus et al .…”

Section: Discussionmentioning

confidence: 99%

Salicylic acid has a role in regulating gene expression during leaf senescence

Morris¹,

Mackerness²,

Page³

et al. 2000

The Plant Journal

489

339

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SummaryLeaf senescence is a complex process that is controlled by multiple developmental and environmental signals and is manifested by induced expression of a large number of different genes. In this paper we describe experiments that show, for the ®rst time, that the salicylic acid (SA)-signalling pathway has a role in the control of gene expression during developmental senescence. Arabidopsis plants defective in the SA-signalling pathway (npr1 and pad4 mutants and NahG transgenic plants) were used to investigate senescence-enhanced gene expression, and a number of genes showed altered expression patterns. Senescence-induced expression of the cysteine protease gene SAG12, for example, was conditional on the presence of SA, together with another unidenti®ed senescence-speci®c factor. Changes in gene expression patterns were accompanied by a delayed yellowing and reduced necrosis in the mutant plants defective in SA-signalling, suggesting a role for SA in the cell death that occurs at the ®nal stage of senescence. We propose the presence of a minimum of three senescence-enhanced signalling factors in senescing leaves, one of which is SA. We also suggest that a combination of signalling factors is required for the optimum expression of many genes during senescence.

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Section: Discussionmentioning

confidence: 99%

Salicylic acid has a role in regulating gene expression during leaf senescence

Morris¹,

Mackerness²,

Page³

et al. 2000

The Plant Journal

489

339

View full text Add to dashboard Cite

show abstract

“…Moreover, treatment of cucumber with SA also induced peroxidase activity and resistance to C. lagenarium [100, 124a]. Increases in SA levels recently have also been documented in Arabidopsis thaliana after infection with turnip crinkle virus ( [ 132]; Dempsey, Wobbe and Klessig, unpublished results) or P. syringae [126] and in tobacco infected by tobacco necrosis virus, P. syringae, and Peronospora tabacina [120] and Erwinia carotovora [90a].…”

Section: S a -A S I G N A L For D E F E N S Ementioning

confidence: 99%

“…[36,37]). The rapid kinetics of this oxidative burst diminishes the possibility that it resuits from SA inhibition of catalase during the initial infection, since elevated SA levels are not detected until 8-24 h or more after infection, depending on the system [74,85,100,120,126]. In contrast, during a secondary infection when free SA might be rapidly produced by hydrolysis of stored SAG, an oxidative burst might be mediated in part by SA.…”

Section: Mechanism Of Action Of Samentioning

confidence: 99%

“…Alternatively, altering the reception of the SA signal or mimicking its effect through the use of other synthetic compounds may hold promise. The re-cent studies with INA suggest that the latter is a viable approach [83,126,131,132,143]. Finally, given the broad physiological effects of SA (and aspirin) in animal systems, insight into SA's mode of action(s) in plants may have implications beyond the plant world.…”

Section: Perspectivementioning

confidence: 99%

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The salicylic acid signal in plants

1994

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“…The SA signalling is not unique to tobacco. Increases in endogenous SA levels in pathogen infected tissues of cucumber, Arabidopsis thaliana, and potato have also been documented (Métraux et al 1990, Rasmussen et al 1991, Smith et al 1991, Summermatter et al 1994, Coquoz et al 1995. A dramatic rise in SA levels (10-to 100-fold) was detected in the cucumber plants inoculated with tobacco necrosis virus (TNV), Colletotrichum lagenarium or Pseudomonas syringae pv syringae.…”

Section: Sa Pathogen Invasion and The Pr-2d Inductionmentioning

confidence: 87%