Abstract:
:Salicylic acid (SA) is implicated in the induction of programmed cell death (PCD) associated with pathogen defense responses because SA levels increase in response to PCD-inducing infections, and PCD development can be inhibited by expression of salicylate hydroxylase encoded by the bacterial nahG gene. The acd11 mutant of Arabidopsis (Arabidopsis thaliana L. Heynh.) activates PCD and defense responses that are fully suppressed by nahG. To further study the role of SA in PCD induction, we compared phenotypes of acd11/nahG with those of acd11/eds5-1 and acd11/sid2-2 mutants deficient in a putative transporter and isochorismate synthase required for SA biosynthesis. We show that sid2-2 fully suppresses SA accumulation and cell death in acd11, although growth inhibition and premature leaf chlorosis still occur. In addition, application of exogenous SA to acd11/sid2-2 is insufficient to restore cell death. This indicates that isochorismate-derived compounds other than SA are required for induction of PCD in acd11 and that some acd11 phenotypes require NahG-degradable compounds not synthesized via isochorismate.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Brodersen P,Malinovsky FG,Hématy K,Newman MA,Mundy Jdoi
10.1104/pp.105.059303subject
Has Abstractpub_date
2005-06-01 00:00:00pages
1037-45issue
2eissn
0032-0889issn
1532-2548pii
pp.105.059303journal_volume
138pub_type
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