Elevated temperature reduces starch deposition in wheat endosperm by reducing the activity of soluble starch synthase

Planta ◽  
1993 ◽  
Vol 191 (3) ◽  
Author(s):  
P.L. Keeling ◽  
P.J. Bacon ◽  
D.C. Holt
Keyword(s):  
Elevated Temperature ◽  
Soluble Starch ◽  
Starch Synthase ◽  
Wheat Endosperm

Thermal Characteristics of Soluble Starch Synthase From Wheat Endosperm

1995 ◽  
Vol 22 (4) ◽  
pp. 703 ◽  
Author(s):  
CF Jenner ◽  
K Denyer ◽  
J Guerin
Keyword(s):  
Thermal Characteristics ◽  
Soluble Starch ◽  
Starch Synthase ◽  
Wheat Grain ◽  
Wheat Endosperm ◽  
Temperature Range ◽  
Higher Temperature ◽  
Temperature Responses

The aim of the work reported in this paper was to characterise the thermal responses of soluble starch synthase (SSS) extracted from the endosperm of the developing wheat grain. Using partially purified preparations of SSS, the reaction obeyed Michaelis-Menten kinetics with both substrates amylopectin and ADPglucose. Both the Vmax and the Km varied with temperature. Values for Vmax were higher at 45�C compared with 25�C. However, the Km values for both substrates were also higher at 45�C than at 25�C indicating that the affinity of the enzyme for its substrates was reduced at the higher temperature. Over the temperature range 15-45�C, the Km for arnylopectin was minimal at 20�C, and rose exponentially between 25 and 45�C. Kinetic analyses indicated that the reaction was sequential and that the substrates could bind to the enzyme in either order. At 25�C the binding of one substrate to the enzyme increased the affinity of the complex for the second substrate but at 45�C these effects were abolished. These thermal characteristics of SSS could explain certain important features of the temperature responses of starch deposition in the wheat grain in vivo.

scholarly journals Toward an understanding of the biogenesis of the starch granule. Determination of granule-bound and soluble starch synthase functions in amylopectin synthesis.

1994 ◽  
Vol 269 (40) ◽  
pp. 25150-25157
Author(s):  
M.L. Maddelein ◽  
N. Libessart ◽  
F. Bellanger ◽  
B. Delrue ◽  
C. D'Hulst ◽  
...  
Keyword(s):  
Starch Granule ◽  
Soluble Starch ◽  
Starch Synthase

scholarly journals QTL-seq identifies cooked grain elongation QTLs near soluble starch synthase and starch branching enzymes in rice (Oryza sativa L.)

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Siwaret Arikit ◽  
Samart Wanchana ◽  
Srisawat Khanthong ◽  
Chatree Saensuk ◽  
Tripop Thianthavon ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Oryza Sativa L ◽  
Soluble Starch ◽  
Starch Synthase ◽  
Starch Branching Enzymes ◽  
Branching Enzymes

scholarly journals Suppression of starch synthase I expression affects the granule morphology and granule size and fine structure of starch in wheat endosperm

2014 ◽  
Vol 65 (8) ◽  
pp. 2189-2201 ◽  
Author(s):  
S. J. McMaugh ◽  
J. L. Thistleton ◽  
E. Anschaw ◽  
J. Luo ◽  
C. Konik-Rose ◽  
...  
Keyword(s):  
Fine Structure ◽  
Granule Size ◽  
Starch Synthase ◽  
Wheat Endosperm ◽  
Granule Morphology

scholarly journals Structure, Organization, and Chromosomal Location of the Gene Encoding a Form of Rice Soluble Starch Synthase

1995 ◽  
Vol 108 (2) ◽  
pp. 677-683 ◽  
Author(s):  
Ki. Tanaka ◽  
S. Ohnishi ◽  
N. Kishimoto ◽  
T. Kawasaki ◽  
T. Baba
Keyword(s):  
Chromosomal Location ◽  
Soluble Starch ◽  
Starch Synthase ◽  
Gene Encoding

scholarly journals Expression of a rice soluble starch synthase gene in transgenic wheat improves the grain yield under heat stress conditions

2018 ◽  
Vol 54 (3) ◽  
pp. 216-227 ◽  
Author(s):  
Bin Tian ◽  
Shyamal K. Talukder ◽  
Jianming Fu ◽  
Allan K. Fritz ◽  
Harold N. Trick
Keyword(s):  
Heat Stress ◽  
Grain Yield ◽  
Transgenic Wheat ◽  
Soluble Starch ◽  
Starch Synthase ◽  
Stress Conditions
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