Diel activity of sucrose phosphate synthase in rice. [Oryza sativa L]

Conference · Wed May 01 00:00:00 EDT 1991 · Plant Physiology, Supplement; (United States)

OSTI ID:5403581

Hussain, M W; Bowes, G; Rowland-Bamford, A J; Allen, L H ^[1]

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1. Univ. of Florida, Gainesville (United States)

Rice (Oryza sativa L.) was grown in growth chambers at 28/23C day/night temperatures with 16-h photoperiod at 600 umol m{sup {minus}2} s{sup {minus}1}. Diel sucrose phosphate synthase (SPS) activity, at 21 days after planting, was measured at saturating substrate concentrations. Data suggests that SPS activity increased during illumination to a maximum of 0.8 nmol mg{sup {minus}1} protein min{sup {minus}1} after 5h. Throughout the remainder of the light period there was a slow decline in activity. Upon darkening, activity further declined to 0.4 nmol mg{sup {minus}1} protein min{sup {minus}1}, a basal level that was maintained throughout the night. It appears that rice SPS undergoes light/dark transitions, suggesting there may be two kinetic forms of SPS. Changes in SPS activity will be discussed in relation to kinetic studies, and also CO{sub 2} enrichment of rice during growth.

• DOE Contract Number: AI05-88ER69014
• OSTI ID: 5403581
• Report Number(s): CONF-9107184-; CODEN: PPYSA
• Journal Information: Plant Physiology, Supplement; (United States), Vol. 96:1; Conference: Annual meeting of the American Society of Plant Physiology, Albuquerque, NM (United States), 28 Jul - 1 Aug 1991; ISSN 0079-2241
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
RICE
ENZYME ACTIVITY
CARBON DIOXIDE
DAILY VARIATIONS
EXPOSURE CHAMBERS
GLYCOSYL TRANSFERASES
PLANT GROWTH
VISIBLE RADIATION
CARBON COMPOUNDS
CARBON OXIDES
CEREALS
CHALCOGENIDES
ELECTROMAGNETIC RADIATION
ENZYMES
GRAMINEAE
GROWTH
LILIOPSIDA
MAGNOLIOPHYTA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLANTS
PROTEINS
RADIATIONS
TRANSFERASES
VARIATIONS
550200* - Biochemistry