Regulation of sucrose synthesis in water stressed leaves
Conference
·
· Plant Physiology, Supplement; (United States)
OSTI ID:5405589
- Rutgers, The State Univ. of New Jersey, New Brunswick (United States)
Alteration in carbon metabolism and carbohydrate partitioning occur in drought stressed plants. Some species accumulate large quantities of starch in the chloroplast, which may be used to support sucrose synthesis under conditions of limited carbon supply. The authors monitored chemical partitioning of carbon between sugars and starch and the activity of sucrose phosphate synthase (SPS) and fructose 1,6 bisphosphatase (FBPase) in the source leaves of water stressed tomatoes. Plants were stressed by withdrawing water for 10 days and rewatered for recovery. Water potential dropped from {minus}0.8 to {minus}2.2MPA in 10 days, but recovered to control level 2 days after rewatering. Photosynthetic rates as measured by the activity of Rubisco followed similar patterns to those of water potential. After 10 days, leaf starch levels decreased to less than 50% of control. Sucrose levels did not increase significantly, but hexose levels increased 3-4 fold during the stress period, and decreased to control levels 1 day after rewatering. FBPase activity decreased and SPS activity increased under stress conditions. Upon rewatering, the activity of FBPase and SPS returned to control levels. Presence of large quantities of hexose and activation of SPS in stressed leaves suggested that additional sucrose synthesized under stress was hydrolyzed to hexoses, presumably due to enhanced invertase activity.
- OSTI ID:
- 5405589
- Report Number(s):
- CONF-9107184--
- Conference Information:
- Journal Name: Plant Physiology, Supplement; (United States) Journal Volume: 96:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
540210* -- Environment
Terrestrial-- Basic Studies-- (1990-)
BIOLOGICAL EFFECTS
BIOLOGICAL STRESS
CARBOHYDRATES
CARBON
CARBON-CARBON LYASES
CARBOXY-LYASES
CHEMICAL REACTIONS
DROUGHTS
ELEMENTS
ENVIRONMENTAL EFFECTS
ENZYME ACTIVITY
ENZYMES
LEAVES
LYASES
METABOLISM
NONMETALS
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PROTEINS
RIBULOSE DIPHOSPHATE CARBOXYLASE
SYNTHESIS
540210* -- Environment
Terrestrial-- Basic Studies-- (1990-)
BIOLOGICAL EFFECTS
BIOLOGICAL STRESS
CARBOHYDRATES
CARBON
CARBON-CARBON LYASES
CARBOXY-LYASES
CHEMICAL REACTIONS
DROUGHTS
ELEMENTS
ENVIRONMENTAL EFFECTS
ENZYME ACTIVITY
ENZYMES
LEAVES
LYASES
METABOLISM
NONMETALS
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PROTEINS
RIBULOSE DIPHOSPHATE CARBOXYLASE
SYNTHESIS