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Low levels of strigolactones in roots as a component of the systemic signal of drought stress in tomato
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SYSNO ASEP 0468500 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Low levels of strigolactones in roots as a component of the systemic signal of drought stress in tomato Author(s) Visentin, I. (IT)
Vitali, M. (IT)
Ferrero, M. (IT)
Zhang, Y. (US)
Ruyter-Spira, C. (NL)
Novák, Ondřej (UEB-Q) RID, ORCID, SAI
Strnad, Miroslav (UEB-Q) RID, ORCID
Lovisolo, C. (NL)
Schubert, A. (DE)
Cardinale, F. (NL)Number of authors 10 Source Title New Phytologist - ISSN 0028-646X
Roč. 212, č. 4 (2016), s. 954-963Number of pages 10 s. Language eng - English Country GB - United Kingdom Keywords abscisic-acid ; plant-responses ; lotus-japonicus ; biosynthesis ; arabidopsis ; pea ; hormone ; growth ; xylem ; soil ; abscisic acid (ABA) ; drought ; strigolactones (SL) ; systemic signalling ; tomato (Solanum lycopersicum) Subject RIV EB - Genetics ; Molecular Biology R&D Projects LO1204 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UEB-Q - RVO:61389030 UT WOS 000389189100027 DOI 10.1111/nph.14190 Annotation Strigolactones (SL) contribute to drought acclimatization in shoots, because SL-depleted plants are hypersensitive to drought due to stomatal hyposensitivity to abscisic acid (ABA). However, under drought, SL biosynthesis is repressed in roots, suggesting organ specificity in their metabolism and role. Because SL can be transported acropetally, such a drop may also affect shoots, as a systemic indication of stress.
We investigated this hypothesis by analysing molecularly and physiologically wild-type (WT) tomato (Solanum lycopersicum) scions grafted onto SL-depleted rootstocks, compared with self-grafted WT and SL-depleted genotypes, during a drought time-course.
Shoots receiving few SL from the roots behaved as if under mild stress even if irrigated. Their stomata were hypersensitive to ABA (likely via a localized enhancement of SL synthesis in shoots). Exogenous SL also enhanced stomata sensitivity to ABA.
As the partial shift of SL synthesis from roots to shoots mimics what happens under drought, a reduction of root-produced SL might represent a systemic signal unlinked from shootward ABA translocation, and sufficient to prime the plant for better stress avoidance.Workplace Institute of Experimental Botany Contact David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Year of Publishing 2017
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