<i>ALTERED MERISTEM PROGRAM1</i> has conflicting effects on the tolerance to heat shock and symptom development after <i>Pseudomonas syringae</i> infection

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>An <I>Arabidopsis thaliana ALTERED MERISTEM PROGRAM1</I> (<I>AtAMP1</I>), which encodes a putative glutamate carboxypeptidase, not only controls shoot apical meristem development, but also is involved in tolerance response to abiotic stresses. Here, we introduce a novel mutant; named <I>amp1-32</I> that is a phenocopier to previously isolated different <I>amp1</I> mutant alleles. Interestingly, tiny leaves were continuously developed at the bottom of pre-emerged leaves in the <I>amp1-32</I>. The <I>amp1-32</I> mutant was less sensitive to heat shock treatment lasting for 3 h, whereas disease symptoms were severely developed in the mutant after <I>Pseudomonas syringae</I> infection. The mRNA levels of 171 genes were significantly altered in the mutant, as compared to wild-type plants. The transcription of genes involved in hormone signaling, post-embryonic development, and shoot development were up-regulated in the <I>amp1-32</I> mutant, whereas expression of genes related to responsiveness to pathogens and (in)organic matters, were decreased in the mutant. Taken together, perturbation of CK- and ABA-related events by AMP1 mutation caused aberrant development phenotype and conflicting responses against abiotic and biotic stresses in <I>Arabidopsis</I>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel amp1-32 mutant shows aberrant growth and development phenotypes. </LI> <LI> The amp1-32 mutant tolerates heat treatment, but shows severe symptom development after <I>P. syringae</I> infection. </LI> <LI> Mutation of the AMP1 causes transcriptional reprogramming in Arabidopsis. </LI> </UL> </P>