Endogenous peptide defense signals in Arabidopsis differentially amplify signaling for the innate immune response

Dolly submitted, created time 1 year 6 months (www.pnas.org)

AtPep1, a 23-aa peptide encoded by Arabidopsis PROPEP1, a member of a small, six-member gene family, activates expression of the defense gene PDF1.2 (encoding defensin) and its own precursor gene, PROPEP1, through the jasmonate/ethylene signaling pathway, mediated by a cell-surface receptor, PEPR1

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Constitutive activation of a plasma membrane H+-ATPase prevents abscisic acid-mediated stomatal closure

addict submitted, created time 1 year 6 months (www.nature.com)

We report two dominant mutations in the OPEN STOMATA2 (OST2) locus of Arabidopsis that completely abolish stomatal response to ABA, but importantly, to a much lesser extent the responses to CO2 and darkness. The OST2 gene encodes the major plasma membrane H+-ATPase AHA1, and both mutations cause constitutive activity of this pump, leading to necrotic lesions. H+-ATPases have been traditionally assumed to be general endpoints of all signaling pathways affecting membrane polarization and transport

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