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Modulation of the hormone setting by Rhodococcus fascians results in ectopic KNOX activation in Arabidopsis
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SYSNO ASEP 0322279 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Modulation of the hormone setting by Rhodococcus fascians results in ectopic KNOX activation in Arabidopsis Překlad názvu Modulace uspořádání hormonů pomocí Rhodococcus fascians má za následek ektopickou aktivaci KNOX genu v Arabidopsis Tvůrce(i) Depuydt, S. (BE)
Doležal, Karel (UEB-Q) RID, ORCID
Van Lijsebettens, M. (BE)
Moritz, T. (SE)
Holsters, M. (BE)
Vereecke, D. (BE)Zdroj.dok. Plant Physiology. - : Oxford University Press - ISSN 0032-0889
Roč. 146, č. 3 (2008), s. 1267-1281Poč.str. 15 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova KNOTTED1-LIKE HOMEOBOX GENE ; CYTOKININ BIOSYNTHESIS ; MERISTEM ACTIVITY Vědní obor RIV EB - Genetika a molekulární biologie CEZ AV0Z50380511 - UEB-Q (2005-2011) UT WOS 000256412200049 DOI 10.1104/pp.107.113969 Anotace The biotrophic actinomycete Rhodococcus fascians has a profound impact on plant development and a common aspect of the symptomatology is the deformation of infected leaves. In Arabidopsis ( Arabidopsis thaliana), the serrated leaf margins formed upon infection resemble the leaf phenotype of transgenic plants with ectopic expression of KNOTTED-like homeobox (KNOX) genes. Through transcript profiling, we demonstrate that class-I KNOX genes are transcribed in symptomatic leaves. Functional analysis revealed that BREVIPEDICELLUS/KNOTTED-LIKE1 and mainly SHOOT MERISTEMLESS were essential for the observed leaf dissection. However, these results also positioned the KNOX genes downstream in the signaling cascade triggered by R. fascians infection. The much faster activation of ARABIDOPSIS RESPONSE REGULATOR5 and the establishment of homeostatic and feedback mechanisms to control cytokinin (CK) levels support the overrepresentation of this hormone in infected plants due to the secretion by the pathogen, thereby placing the CK response high up in the cascade. Hormone measurements show a net decrease of tested CKs, indicating either that secretion by the bacterium and degradation by the plant are in balance, or, as suggested by the strong reaction of 35S:CKX plants, that other CKs are at play. At early time points of the interaction, activation of gibberellin 2-oxidase presumably installs a local hormonal setting favorable for meristematic activity that provokes leaf serrations. The results are discussed in the context of symptom development, evasion of plant defense, and the establishment of a specific niche by R. fascians. Pracoviště Ústav experimentální botaniky Kontakt David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Rok sběru 2009
Počet záznamů: 1