Effects of ozone in ambient air on physiological parameters during senescence of flag leaves of spring wheat. [Triticum aestivum]

Conference · Sat Aug 01 00:00:00 EDT 1987 · Plant Physiol., Suppl.; (United States)

OSTI ID:6066501

Grandjean, A; Fuhrer, J

A spring wheat cultivar (Triticum aestivum, cv. Albis) was field-grown near Bern (Switzerland) in open-top chambers or non-chambered plots and exposed to O/sub 3/ daily during the growing period to study effects on physiological parameters associated with senescence of flag leaves. Seasonal 8-hr/d mean O/sub 3/-concentration used were 0.020 (charcoal-filtered, F), 0.035 (non-filtered, NF) and 0.103 ..mu..1/1 (O/sub 3/ added from 9am to 5pm, NF+O/sub 3/) inside, and 0.038 ..mu..1/1 outside the chambers. In leaves exposed to NF+O/sub 3/ chlorophyll loss started 10 d before anthesis and was more rapid than in leaves treated with F or NF. Adaxial and abaxial stomatal conductances were highest in the NF treatment, and about 15% and 80% lower in F and NF+O/sub 3/, respectively. Synthesis of ethylene and 1-aminocyclopropane-1-carboxylic acid (free and conjugated ACC) was stimulated in the F and NF treatment between 10 and 20 d after anthesis. Exposure to NF+O/sub 3/ led to strong inhibition of ethylene and ACC synthesis after anthesis. The results suggest that ambient levels of O/sub 3/ at this site have little effect on these parameters, but that chronic exposure to elevated O/sub 3/ levels is inhibitory to senescence processes of flag leaves, e.g. synthesis of ACC and ethylene.

• Research Organization: Swiss Federal Research Station, Liebefeld-Bern
• OSTI ID: 6066501
• Report Number(s): CONF-8707108-
• Journal Information: Plant Physiol., Suppl.; (United States), Vol. 83:4; Conference: Annual meeting of the American Society of Plant Physiologists, St. Louis, MO, USA, 19 Jul 1987
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
OZONE
BIOLOGICAL EFFECTS
WHEAT
PHYSIOLOGY
CARBOXYLIC ACIDS
CHLOROPHYLL
CHRONIC EXPOSURE
ETHYLENE
INHIBITION
LEAVES
STOMATA
ALKENES
CEREALS
GRASS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
OPENINGS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHYTOCHROMES
PIGMENTS
PLANTS
PORPHYRINS
PROTEINS
551000* - Physiological Systems