Interaction of elevated CO sub 2 and UV-B radiation on growth and photosynthesis in rice. [Oryza sativa L]

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

OSTI ID:5559440

Ziska, L H; Termura, A H ^[1]

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1. Univ. of Maryland, College Park (United States)

Rice (Oryza sativa L. ev IR-36 and Fujiyama) was grown at the Duke University Phytotron to determine if CO{sub 2} induced increases in biomass, yield and photosynthesis were modified by increases in ultraviolet (UV-B) radiation resulting from stratospheric ozone depletion. Two levels of CO{sub 2}(360 and 650 {mu}l l{sup {minus}1}) and two levels of UV-B radiation (8.8 and 15.8 kJm{sup {minus}2}UV-B{sub BE}) were used as the experimental treatments. The levels of UV-B used in the experiment approximated that currently received at Durham, NC (35{degree}N) and that anticipated at the equator (0{degree}N) with a 10% ozone depletion under clear sky conditions during the seasonal maxima. Total plant and panicle dry weight increased significantly with elevated CO{sub 2} in both cultivars when compared to the control. However, if UV-B and CO{sub 2} increased concurrently, no difference in biomass or panicle weight was observed in cv IR-36 relative to the control. In cv Fujiyama, biomass and yield were still significantly higher under an elevated CO{sub 2} treatment alone. Photosynthesis increased and dark respiration decreased for single leaves in both cultivars at high CO{sub 2} but the effect of CO{sub 2} was reduced relative to the ambient condition if supplemental UV-B radiation was included. Data from this experiment indicate that increased UV-B radiation may modify CO{sub 2}-induced increases in biomass, yield or photosynthetic components, and that current data based solely on elevated CO{sub 2} effects may be inadequate to predict future changes in plant development based on anticipated, future increases in CO{sub 2} and stratospheric ozone depletion.

• OSTI ID: 5559440
• 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

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
54 ENVIRONMENTAL SCIENCES
CARBON DIOXIDE
BIOLOGICAL EFFECTS
FAR ULTRAVIOLET RADIATION
RICE
PLANT GROWTH
BIOMASS
OZONE LAYER
PHOTOSYNTHESIS
PRODUCTIVITY
RESPIRATION
CARBON COMPOUNDS
CARBON OXIDES
CEREALS
CHALCOGENIDES
CHEMICAL REACTIONS
ELECTROMAGNETIC RADIATION
ENERGY SOURCES
GRAMINEAE
GROWTH
LAYERS
LILIOPSIDA
MAGNOLIOPHYTA
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PLANTS
RADIATIONS
RENEWABLE ENERGY SOURCES
SYNTHESIS
ULTRAVIOLET RADIATION
560300* - Chemicals Metabolism & Toxicology
540110