Biosynthesis of abscisic acid in fungi: identification of a sesquiterpene cyclase as the key enzyme inBotrytis cinerea

2018 ◽  
Vol 20 (7) ◽  
pp. 2469-2482 ◽  
Author(s):  
Inmaculada Izquierdo‐Bueno ◽  
Victoria E. González‐Rodríguez ◽  
Adeline Simon ◽  
Bérengère Dalmais ◽  
Jean‐Marc Pradier ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Key Enzyme ◽  
Sesquiterpene Cyclase

Sucrose and light regulation of a cold-inducible UDP-glucose pyrophosphorylase gene via a hexokinase-independent and abscisic acid-insensitive pathway in Arabidopsis

2001 ◽  
Vol 354 (1) ◽  
pp. 67-72 ◽  
Author(s):  
Iwona CIERESZKO ◽  
Henrik JOHANSSON ◽  
Leszek A. KLECZKOWSKI
Keyword(s):  
Abscisic Acid ◽  
Okadaic Acid ◽  
Expression Profiles ◽  
Light Regulation ◽  
Plant Responses ◽  
Gene Encoding ◽  
Environmental Signals ◽  
Sugar Signalling ◽  
Key Enzyme ◽  
Aba Insensitive

UDP-glucose pyrophosphorylase (UGPase) is a key enzyme producing UDP-glucose, which is involved in an array of metabolic pathways concerned with, among other functions, the synthesis of sucrose and cellulose. An Arabidopsis thaliana UGPase-encoding gene, Ugp, was profoundly up-regulated by feeding sucrose to the excised leaves and by an exposure of plants to low temperature (5°C). The UGPase activity and its protein content also increased under conditions of sucrose feeding and exposure to cold. The sucrose effect on Ugp was apparently specific and was mimicked by exposure of dark-adapted leaves to light. Drought and O2 deficiency had some down-regulating effects on expression of Ugp. The sugar-signalling pathway for Ugp regulation was independent of hexokinase, as was found by using transgenic plants with increased and decreased expression of the corresponding gene. Subjecting mutants deficient in abscisic acid (ABA) to cold stress conditions had no effect on Ugp expression profiles. Okadaic acid was a powerful inhibitor of Ugp expression, whereas it up-regulated the gene encoding sucrose synthase (Sus1), indicating distinct transduction pathways in transmitting the sugar signal for the two genes in A. thaliana. We suggest that Ugp gene expression is mediated via a hexokinase-independent and ABA-insensitive pathway that involves an okadaic acid-responsive protein phosphatase. The data point towards Ugp as a possible regulatory entity that is closely involved in the homoeostatic readjustment of plant responses to environmental signals.

scholarly journals Arabidopsis CYP707As Encode (+)-Abscisic Acid 8′-Hydroxylase, a Key Enzyme in the Oxidative Catabolism of Abscisic Acid

2004 ◽  
Vol 134 (4) ◽  
pp. 1439-1449 ◽  
Author(s):  
Shigeki Saito ◽  
Nobuhiro Hirai ◽  
Chiaki Matsumoto ◽  
Hajime Ohigashi ◽  
Daisaku Ohta ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Key Enzyme

scholarly journals Regulation of drought tolerance by gene manipulation of 9-cis-epoxycarotenoid dioxygenase, a key enzyme in abscisic acid biosynthesis in Arabidopsis

2001 ◽  
Vol 27 (4) ◽  
pp. 325-333 ◽  
Author(s):  
Satoshi Iuchi ◽  
Masatomo Kobayashi ◽  
Teruaki Taji ◽  
Masaaki Naramoto ◽  
Motoaki Seki ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Drought Tolerance ◽  
Acid Biosynthesis ◽  
Gene Manipulation ◽  
Abscisic Acid Biosynthesis ◽  
Key Enzyme

scholarly journals Structural Insights into Maize Viviparous14, a Key Enzyme in the Biosynthesis of the Phytohormone Abscisic Acid

2010 ◽  
Vol 22 (9) ◽  
pp. 2970-2980 ◽  
Author(s):  
Simon A.J. Messing ◽  
Sandra B. Gabelli ◽  
Ignacia Echeverria ◽  
Jonathan T. Vogel ◽  
Jiahn Chou Guan ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Key Enzyme ◽  
Structural Insights
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