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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Deciphering cGMP signatures and cGMP-dependent pathways in plant defence
Plant Signaling and Behavior, Volume 4, No. 4, Year 2009
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Description
The second messenger, 3',5'-cyclic monophosphate (cGMP), is a critical component of many different processes in plants while guanylyl cyclases that catalyse the formation of cGMP from GTP have remained somewhat elusive in higher plants. Consequently, two major aims are the discovery of novel GCs and the identification of cGMP mediated processes. Recently, we have reported temporal signatures of ozone (O3)-induced hydrogen peroxide (H 2O2) and nitric oxide (NO) generation, their effect on cGMP generation, and consequent transcriptional changes of genes diagnostic for stress responses in tobacco. We demonstrated that O3 and NO induced early transcriptional activation of the scavenger encoding proteins, alternative oxidase (AOX1a), glutathione peroxidase (GPX) and the induction of ethylene production through aminocyclopropancarboxylic acid synthase (ACS2) are cGMP-independent. By contrast, the early response of the phenylalanine ammonia lyase gene (PALa) and the late response of the gene encoding the pathogenesis-related protein (PR1a) show critical dependence on cGMP. Here we show differential cGMP responses to virulent and avirulent Pseudomonas syringae strains and propose that host-pathogen recognition and/or down-stream processes are transduced by complex cGMP signatures. This is in accordance with the identification of a growing number of multi-domain molecules in Arabidopsis that are reported to contain putative functional GC catalytic centers. © 2009 Landes Bioscience.
Authors & Co-Authors
Meier, Stuart K.
South Africa
South African National Institute of Bioinformatics
Madeo, Laura
Italy, Perugia
Università Degli Studi Di Perugia
Ederli, Luisa
Italy, Perugia
Università Degli Studi Di Perugia
Donaldson, Lara
South Africa, Bellville
University of the Western Cape
Pasqualini, Stefania
Italy, Perugia
Università Degli Studi Di Perugia
Gehring, Chris A.
South Africa, Bellville
University of the Western Cape
Statistics
Citations: 57
Authors: 6
Affiliations: 3
Identifiers
Doi:
10.4161/psb.4.4.8066
ISSN:
15592316
e-ISSN:
15592324
Research Areas
Environmental
Genetics And Genomics
Substance Abuse