Expression of several genes involved in sucrose-starch metabolism as affected by different strategies to induce phosphate deficiency in Arabidopsis

• Autorzy: Ciereszko I , Kleczkowski L.A.
• Języki publikacji: EN

Abstrakty

EN

The effects of inorganic phosphate (Pi) deficiency on expression of genes encoding ADP-glucose pyrophosphorylase small and large subunits (ApS and ApL1, ApL2, ApL3 genes), UDP-glucose pyrophosphorylase (Ugp gene), sucrose synthase (Sus1), soluble and insoluble acid invertases (Inv and Invcw) and hexokinase (Hxk1 gene), all involved in carbohydrate metabolism, were investigated in Arabidopsis thaliana (L.) Heynh. We used soil-grown pho mutants affected in Pi status, as well as wild-type (wt) plants grown under Pi deficiency conditions in liquid medium, and leaves of wt plants fed with D-mannose. Generally, ApS, ApL1, Ugp and Inv genes were upregulated, although to a varied degree, under conditions of Pi-stress. The applied conditions had differential effects on expression of other genes studied. For instance, Sus1 was down regulated in pho1 (Pi-deficient) mutant, but was unaffected in wt plants grown in liquid medium under P-defi- ciency. Mannose had distinct concentration-dependent effects on expression of genes under study, possibly reflecting a dual role of mannose as a sink for Pi and as glucose analog. Feeding Pi (at up to 200 mM) to the deiached leaves of wt plants strongly affected the expression of ApL1, ApL2, Sus1 and Inv genes, possibly due to an osmotic effect exerted by Pi. The data suggest that ADP-glucose and UDP-glucose pyrophosphorylases (enzymes indirectly involved in Pi recycling) as well as invertases (sucrose hydrolysis) are transcriptionally regulated by Pi-deficiency, which may play a role in homeostatic mechanisms that acclimate the plant to the Pi-stress conditions.

Słowa kluczowe

EN

sucrose; plant physiology; starch; pho mutant; gene expression; phosphate starvation; metabolism regulation; Arabidopsis; carbohydrate

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2005
• Tom: 27
• Numer: 2
• Opis fizyczny: p.147-155,fig.,ref.

Twórcy

autor

Ciereszko I

• University of Bialystok, Swierkowa 20b, 15-950 Bialystok, Poland

autor

Kleczkowski L.A.

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