Starch metabolism in germinating soybean cotyledons is sensitive to clinorotation and centrifugation.
Soybean (Glycine max [L.] Merr. cv. McCall) seedlings germinated and grew for 6d under the altered gravity conditions of horizontal clinorotation and centrifugation.  Both of these conditions resulted in decreased growth relative to the control (vertically rotated) plants.  Starch concentration in the cotyledons was lower in the clinorotated plants and was higher in the centrifuged plants compared to the controls.  The opposite relationship was noted for total lipid concentration.  Of the six starch metabolic enzyme activities measured, only ADP glucose pyrophosphorylase was affected by the gravity treatments; being lower in the cotyledons of the horizontally rotated plants and higher in the cotyledons of the centrifuged plants relative to the control values.
Brown
C S
CS
Plant Space Biology Laboratory, The Bionetics Corporation, Kennedy Space Center, Florida 32899.
Piastuch
W C
WC
D002498:Centrifugation; D002851:Chromatography, High Pressure Liquid; D018548:Cotyledon / Q000737:chemistry / Q000201:enzymology / Q000378:metabolism*; D018525:Germination / Q000502:physiology; D051599:Glucose-1-Phosphate Adenylyltransferase; D006112:Gravitation; D018470:Gravity, Altered; D050356:Lipid Metabolism; D008055:Lipids / Q000032:analysis; D009713:Nucleotidyltransferases / Q000032:analysis / Q000378:metabolism; D012399:Rotation; D013025:Glycine max / Q000737:chemistry / Q000201:enzymology / Q000378:metabolism*; D013213:Starch / Q000032:analysis / Q000378:metabolism*; D013997:Time Factors; D018474:Weightlessness Simulation
D008055:Lipids; D013213:Starch; D009713:Nucleotidyltransferases; D051599:Glucose-1-Phosphate Adenylyltransferase