title: The Arabidopsis pi4kIIIβ1β2 double mutant is salicylic acid-overaccumulating: a new example of salicylic acid influence on plant stature.
abstract: Growth is the best visible sign of plant comfort. If plants are under stress, a difference in growth with control conditions can indicate that something is going wrong (or better). Phytohormones such as auxin, cytokinins, brassinosteroids or giberellins, are important growth regulators and their role in plant growth was extensively studied. On the other hand the role of salicylic acid (SA), a phytohormone commonly connected with plant defense responses, in plant growth is under-rated. However, studies with SA-overaccumulating mutants directly showed an influence of SA on plant growth. Recently we characterized an Arabidopsis SA-overaccumulating mutant impaired in phosphatidylinositol-4-kinases (pi4kIIIβ1β2). This mutant is dwarf. The crossing with mutants impaired in SA signaling revealed that pi4kIIIβ1β2 stunted rosette is due to high SA, while the short root length is not. This brings into evidence that upper and lower parts of the plants, even though they may share common phenotypes, are differently regulated.
authors.affiliation: a Department of Biochemistry and Microbiology; Institute of Chemical Technology Prague ; Prague , Czech Republic.
authors.forename: Martin
authors.initials: M
authors.lastname: Janda
authors.forename: Vladimír
authors.initials: V
authors.lastname: Šašek
authors.forename: Eric
authors.initials: E
authors.lastname: Ruelland
mesh_terms: D019870:1-Phosphatidylinositol 4-Kinase / Q000235:genetics*; D017360:Arabidopsis / Q000033:anatomy & histology* / Q000201:enzymology*; D029681:Arabidopsis Proteins / Q000235:genetics*; D009154:Mutation / Q000235:genetics*; D018515:Plant Leaves / Q000033:anatomy & histology; D018517:Plant Roots / Q000033:anatomy & histology; D020156:Salicylic Acid / Q000378:metabolism*
chemical_list: D029681:Arabidopsis Proteins; D019870:1-Phosphatidylinositol 4-Kinase; C000596017:PI4KIIIbeta1 protein, Arabidopsis; C000596018:PI4KIIIbeta2 protein, Arabidopsis; D020156:Salicylic Acid
keywords: phosphatidylinositol-4-kinase; plant growth; salicylic acid; signaling