Sucrose phosphate synthase activity in rice grown at elevated CO sub 2 and temperature

Conference · Tue May 01 04:00:00 EDT 1990 · Plant Physiology, Supplement; (USA)

OSTI ID:5626581

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

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1. Univ. of Florida, Gainesville (USA) USDA-ARS, Gainesville, FL (USA)

Rice (Oryza sativa L.) was grown at 330 and 660 {mu}L CO{sub 2} L{sup {minus}1} and at 40/33/37, 34/27/31, and 28/21/25{degree}C day/night/paddy water temperatures respectively. Sucrose phosphate synthase (SPS) activity was measured at saturating substrate concentrations at 59 days after planting. SPS activity increased 2 and 3 fold with increasing CO{sub 2} at 28 and 34{degree}C air temperatures respectively. At 40{degree}C SPS activity decreased by 37% at elevated CO{sub 2} and most plants failed to reach maturity. Similar responses were found in leaf samples taken in the dark. These results indicate that SPS, an enzyme involved in the regulation of C partitioning in leaves, increases in activity at elevated CO{sub 2}. This is in contrast to previous results with soybean. The changes in SPS activity will also be discussed in relation to leaf starch/sucrose ratios.

• OSTI ID: 5626581
• Report Number(s): CONF-9007196--
• Conference Information: Journal Name: Plant Physiology, Supplement; (USA) Journal Volume: 93:1
• Country of Publication: United States
• Language: English

Related Subjects

551000* -- Physiological Systems
59 BASIC BIOLOGICAL SCIENCES
BIOLOGICAL EFFECTS
CARBOHYDRATES
CEREALS
DAILY VARIATIONS
DISACCHARIDES
ELECTROMAGNETIC RADIATION
GRAMINEAE
GROWTH
LILIOPSIDA
MAGNOLIOPHYTA
OLIGOSACCHARIDES
ORGANIC COMPOUNDS
PLANT GROWTH
PLANTS
RADIATIONS
RICE
SACCHARIDES
SACCHAROSE
TEMPERATURE EFFECTS
VARIATIONS
VISIBLE RADIATION