Influence of inverse day/night temperature on ozone sensitivity and selected morphological and physiological responses of cucumber

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Journal of the American Society for Horticultural Science; (United States)

OSTI ID:5292624

Agrawal, M; Krizek, D T; Agrawal, S B; Kramer, G F; Lee, E H; Mirecki, R M; Rowland, R A ^[1]

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1. Dept. of Agriculture, Beltsville, MD (United States). Climate Stress Lab.

Cucumis sativus L. (evs. Poinsett and Ashley) plants were grown from seed in a growth chamber at a +10C (28/18) or a [minus]10C (18/28) difference (DIF) between day temperature (DT) and night temperature (NT) on a 12-hour photoperiod for 24 days prior to ozone (O[sub 3]) fumigation. Negative DIF, compared to +DIF, reduced plant height, node count, fresh weight, dry weight, and leaf area in both cultivars. Photosynthetic rate (Pn), chlorophyll concentration, and variable chlorophyll fluorescence (F[sub v]) were lower and O[sub 3] injury and polyamine concentrations were higher at [minus]DIF than at +DIF. Ozone fumigation generally increased leaf concentration of polyamines and reduced Pn, stomatal conductance, and chlorophyll fluorescence. Poinsett'' generally had a higher specific leaf mass and higher concentrations of chlorophyll [alpha] and polyamines than did Ashley'', but there was no cultivar difference in O[sub 3] injury, growth response, Pn, or stomatal conductance.

• OSTI ID: 5292624
• Journal Information: Journal of the American Society for Horticultural Science; (United States), Journal Name: Journal of the American Society for Horticultural Science; (United States) Vol. 118:5; ISSN JOSHB5; ISSN 0003-1062
• Country of Publication: United States
• Language: English

Related Subjects

560300* -- Chemicals Metabolism & Toxicology
560400 -- Other Environmental Pollutant Effects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AIR POLLUTION
CUCUMBERS
FOOD
MAGNOLIOPHYTA
MAGNOLIOPSIDA
MORPHOLOGICAL CHANGES
OZONE
PLANTS
POLLUTION
TEMPERATURE DEPENDENCE
TOXICITY
VEGETABLES