Effects of ozone and water stress on net photosynthetic rate of field-grown soybean leaves

Technical Report · Fri Jan 01 00:00:00 EST 1988

OSTI ID:5512566

Vozzo, S F; Miller, J E; Heagle, A S; Pursley, W A

Detailed physiological measurements were taken in controlled field experiments to better elucidate how environmental stresses interact to affect a soybean plant's physiology and growth. Nondestructive techniques were used to measure weekly and diurnal effects of ozone and water stress on net photosynthesis, stomatal resistance, and water status of field-grown soybean leaves. Open-top field chambers were used to expose soybeans to seasonal 12-h/day mean concentrations of 0.018 (CF), 0.059 (1.3NF) and 0.085 (1.9NF) ppm ozone. Soil water levels were well watered (WW) and water stressed (WS). Net carbon exchange-rate measurements (CER) were taken between 1000 and 1230h EST on center trifoliates with uniform exposure to sunlight. Average CER rates expressed as percent of CF over the growing season were 75% and 55% for WW 1.3NF, and 1.9NF and 90% and 61% for WS 1.3NF and 1.9NF, respectively. Measured mean seasonal photosynthesis rates of the WS CF treatments were 68% of those for the WW CF treatments.

• Research Organization: Agricultural Research Service, Raleigh, NC (USA)
• OSTI ID: 5512566
• Report Number(s): PB-89-197727/XAB
• Resource Relation: Other Information: Pub. in Environmental Pollution, Vol. 53, 471-473(1988)
• 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
BIOLOGICAL STRESS
OZONE
BIOLOGICAL EFFECTS
PLANT GROWTH
ENVIRONMENTAL IMPACTS
WATER
CROPS
LEAVES
NAPAP
PHOTOSYNTHESIS
SOYBEANS
CHEMICAL REACTIONS
FOOD
GROWTH
HYDROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PLANTS
SYNTHESIS
VEGETABLES
560300* - Chemicals Metabolism & Toxicology
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)