Flowering as a condition for xylem expansion in Arabidopsis hypocotyl and root.

Details

Serval ID
serval:BIB_A0B9C025014D
Type
Article: article from journal or magazin.
Collection
Publications
Title
Flowering as a condition for xylem expansion in Arabidopsis hypocotyl and root.
Journal
Current Biology
Author(s)
Sibout R., Plantegenet S., Hardtke C.S.
ISSN
0960-9822 (Print)
ISSN-L
0960-9822
Publication state
Published
Issued date
2008
Volume
18
Number
6
Pages
458-463
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't Publication Status: ppublish
Abstract
In dicotyledons, biomass predominantly represents cell-wall material of xylem, which is formed during the genetically poorly characterized secondary growth of the vasculature. In Arabidopsis hypocotyls, initially proportional secondary growth of all tissues is followed by a phase of xylem expansion and fiber differentiation. The factors that control this transition are unknown. We observed natural variation in Arabidopsis hypocotyl secondary growth and its coordination with root secondary growth. Quantitative trait loci (QTL) analyses of a recombinant inbred line (RIL) population demonstrated separate genetic control of developmentally synchronized secondary-growth parameters. However, major QTL for xylem expansion and fiber differentiation correlated tightly and coincided with major flowering time QTL. Correlation between xylem expansion and flowering was confirmed in another RIL population and also found across Arabidopsis accessions. Gene-expression analyses suggest that xylem expansion is initiated after flowering induction but before inflorescence emergence. Consistent with this idea, transient activation of an inducer of flowering at the rosette stage promoted xylem expansion. Although the shoot was needed to trigger xylem expansion and can control it in a graft-transmissible fashion, the inflorescence stem was not required to sustain it. Collectively, our results suggest that flowering induction is the condition for xylem expansion in hypocotyl and root secondary growth.
Keywords
Arabidopsis/genetics, Arabidopsis/growth & development, Flowers/physiology, Gene Expression Profiling, Genetic Variation, Hypocotyl/growth & development, Hypocotyl/metabolism, Phloem/growth & development, Plant Roots/growth & development, Quantitative Trait Loci, Xylem/growth & development
Pubmed
Web of science
Open Access
Yes
Create date
30/03/2008 21:14
Last modification date
20/08/2019 15:06
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