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A KNOX-Cytokinin Regulatory Module Predates the Origin of Indeterminate Vascular Plants
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SYSNO ASEP 0508110 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title A KNOX-Cytokinin Regulatory Module Predates the Origin of Indeterminate Vascular Plants Author(s) Coudert, Y. (GB)
Novák, Ondřej (UEB-Q) RID, ORCID, SAI
Harrison, C.J. (GB)Number of authors 3 Source Title Current Biology. - : Cell Press - ISSN 0960-9822
Roč. 29, č. 16 (2019), s. 2743-2750Number of pages 8 s. Language eng - English Country US - United States Keywords evo-devo ; indeterminacy ; isopentenyl transferase ; KNOX-cytokinin ; plant evolution ; vascular plant origins Subject RIV EB - Genetics ; Molecular Biology OECD category Biochemistry and molecular biology R&D Projects LO1204 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF16_019/0000827 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UEB-Q - RVO:61389030 UT WOS 000481587900031 EID SCOPUS 85070615480 DOI 10.1016/j.cub.2019.06.083 Annotation The diverse forms of today's dominant vascular plant flora are generated by the sustained proliferative activity of sporophyte meristems at plants’ shoot and root tips, a trait known as indeterminacy [1]. Bryophyte sister lineages to the vascular plants lack such indeterminate meristems and have an overall sporophyte form comprising a single small axis that ceases growth in the formation of a reproductive sporangium [1]. Genetic mechanisms regulating indeterminacy are well characterized in flowering plants, involving a feedback loop between class I KNOX genes and cytokinin [2, 3], and class I KNOX expression is a conserved feature of vascular plant meristems [4]. The transition from determinate growth to indeterminacy during evolution was a pre-requisite to vascular plant diversification, but mechanisms enabling the innovation of indeterminacy are unknown [5]. Here, we show that class I KNOX gene activity is necessary and sufficient for axis extension from an intercalary region of determinate moss shoots. As in Arabidopsis, class I KNOX activity can promote cytokinin biosynthesis by an ISOPENTENYL TRANSFERASE gene, PpIPT3. PpIPT3 promotes axis extension, and PpIPT3 and exogenously applied cytokinin can partially compensate for loss of class I KNOX function. By outgroup comparison, the results suggest that a pre-existing KNOX-cytokinin regulatory module was recruited into vascular plant shoot meristems during evolution to promote indeterminacy, thereby enabling the radiation of vascular plant shoot forms. Workplace Institute of Experimental Botany Contact David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Year of Publishing 2020 Electronic address http://dx.doi.org/10.1016/j.cub.2019.06.083
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