Changes in endogenous abscisic acid and soluble sugars levels during dormancy-release in bulbs of Lilium rubellum

2006 ◽  
Vol 111 (1) ◽  
pp. 68-72 ◽  
Author(s):  
Rong-Yan Xu ◽  
Yoshiji Niimi ◽  
Dong-Sheng Han
Keyword(s):  
Abscisic Acid ◽  
Soluble Sugars ◽  
Dormancy Release ◽  
Endogenous Abscisic Acid

scholarly journals Involvement of Endogenous Abscisic Acid in Onset and Release of Helianthus annuus Embryo Dormancy

1990 ◽  
Vol 92 (4) ◽  
pp. 1164-1168 ◽  
Author(s):  
Marie-Thérèse Le Page-Degivry ◽  
Philippe Barthe ◽  
Ginette Garello
Keyword(s):  
Abscisic Acid ◽  
Helianthus Annuus ◽  
Endogenous Abscisic Acid ◽  
Embryo Dormancy

scholarly journals Sugar/osmoticum levels modulate differential abscisic acid-independent expression of two stress-responsive sucrose synthase genes in Arabidopsis

1999 ◽  
Vol 344 (2) ◽  
pp. 503-509 ◽  
Author(s):  
Annabelle DÉJARDIN ◽  
Lubomir N. SOKOLOV ◽  
Leszek A. KLECZKOWSKI
Keyword(s):  
Signal Transduction ◽  
Abscisic Acid ◽  
Cold Stress ◽  
Osmotic Potential ◽  
Sucrose Synthase ◽  
Cellular Response ◽  
Expression Profiles ◽  
Soluble Sugars ◽  
Leaf Osmotic Potential ◽  
Detached Leaves

Sucrose synthase (Sus) is a key enzyme of sucrose metabolism. Two Sus-encoding genes (Sus1 and Sus2) from Arabidopsis thaliana were found to be profoundly and differentially regulated in leaves exposed to environmental stresses (cold stress, drought or O2 deficiency). Transcript levels of Sus1 increased on exposure to cold and drought, whereas Sus2 mRNA was induced specifically by O2 deficiency. Both cold and drought exposures induced the accumulation of soluble sugars and caused a decrease in leaf osmotic potential, whereas O2 deficiency was characterized by a nearly complete depletion in sugars. Feeding abscisic acid (ABA) to detached leaves or subjecting Arabidopsis ABA-deficient mutants to cold stress conditions had no effect on the expression profiles of Sus1 or Sus2, whereas feeding metabolizable sugars (sucrose or glucose) or non-metabolizable osmotica [poly(ethylene glycol), sorbitol or mannitol] mimicked the effects of osmotic stress on Sus1 expression in detached leaves. By using various sucrose/mannitol solutions, we demonstrated that Sus1 was up-regulated by a decrease in leaf osmotic potential rather than an increase in sucrose concentration itself. We suggest that Sus1 expression is regulated via an ABA-independent signal transduction pathway that is related to the perception of a decrease in leaf osmotic potential during stresses. In contrast, the expression of Sus2 was independent of sugar/osmoticum effects, suggesting the involvement of a signal transduction mechanism distinct from that regulating Sus1 expression. The differential stress-responsive regulation of Sus genes in leaves might represent part of a general cellular response to the allocation of carbohydrates during acclimation processes.

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