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Thermospermine leve...
Thermospermine levels are controlled by an auxin-dependent feedback loop mechanism in Populus xylem
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Milhinhos, Ana (författare)
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- Prestele, Jakob (författare)
- Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)
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- Bollhöner, Benjamin, 1980- (författare)
- Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)
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Matos, Andreia (författare)
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Vera-Sirera, Francisco (författare)
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Rambla, Jose L (författare)
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- Ljung, Karin (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skoglig genetik och växtfysiologi,Department of Forest Genetics and Plant Physiology
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Carbonell, Juan (författare)
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Blazquez, Miguel A (författare)
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- Tuominen, Hannele, 1964- (författare)
- Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)
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Miguel, Celia M (författare)
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(creator_code:org_t)
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- 2013-06-13
- 2013
- Engelska.
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Ingår i: The Plant Journal. - : Wiley. - 0960-7412 .- 1365-313X. ; 75:4, s. 685-698
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https://onlinelibrar...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Polyamines are small polycationic amines that are widespread in living organisms. Thermospermine, synthesized by thermospermine synthase ACAULIS5 (ACL5), was recently shown to be an endogenous plant polyamine. Thermospermine is critical for proper vascular development and xylem cell specification, but it is not known how thermospermine homeostasis is controlled in the xylem. We present data in the Populus model system supporting the existence of a negative feedback control of thermospermine levels in stem xylem tissues, the main site of thermospermine biosynthesis. While over-expression of the ACL5 homologue in Populus, POPACAULIS5, resulted in strong up-regulation of ACL5 expression and thermospermine accumulation in leaves, the corresponding levels in the secondary xylem tissues of the stem were similar or lower than those in the wild-type. POPACAULIS5 over-expression had a negative effect on accumulation of indole-3-acetic acid, while exogenous auxin had a positive effect on POPACAULIS5 expression, thus promoting thermospermine accumulation. Further, over-expression of POPACAULIS5 negatively affected expression of the classIII homeodomain leucine zipper (HD-ZipIII) transcription factor gene PttHB8, a homologue of AtHB8, while up-regulation of PttHB8 positively affected POPACAULIS5 expression. These results indicate that excessive accumulation of thermospermine is prevented by a negative feedback control of POPACAULIS5 transcript levels through suppression of indole-3-acetic acid levels, and that PttHB8 is involved in the control of POPACAULIS5 expression. We propose that this negative feedback loop functions to maintain steady-state levels of thermospermine, which is required for proper xylem development, and that it is dependent on the presence of high concentrations of endogenous indole-3-acetic acid, such as those present in the secondary xylem tissues.
Ämnesord
- NATURVETENSKAP -- Biologi -- Botanik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Botany (hsv//eng)
- NATURVETENSKAP -- Biologi -- Utvecklingsbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Developmental Biology (hsv//eng)
Nyckelord
- POPACAULIS5
- ACAULIS5 (ACL5)
- class III homeodomain leucine zipper transcription factors (HD-ZipIII)
- wood development
- polyamine
- Populus tremulax
- Populus tremuloides
- Populus trichocarpa
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Milhinhos, Ana
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Prestele, Jakob
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Bollhöner, Benja ...
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Matos, Andreia
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Vera-Sirera, Fra ...
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Rambla, Jose L
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visa fler...
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Ljung, Karin
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Carbonell, Juan
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Blazquez, Miguel ...
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Tuominen, Hannel ...
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Miguel, Celia M
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Biologi
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och Botanik
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- NATURVETENSKAP
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NATURVETENSKAP
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och Biologi
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och Utvecklingsbiolo ...
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The Plant Journa ...
- Av lärosätet
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Umeå universitet
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Sveriges Lantbruksuniversitet