Joint action of ozone and hydrogen fluoride on foliar senescence in maize

• Published in: Environmental pollution (1987) Vol. 63; no. 4; pp. 283 - 292
• Main Author: MacLean, David C.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 1990; Elsevier
• Subjects: Agrochemicals products; Animal, plant and microbial ecology; Applied ecology; Biological and medical sciences; chlorophyll; Ecotoxicology, biological effects of pollution; Effects of pollution and side effects of pesticides on plants and fungi; Fundamental and applied biological sciences. Psychology; hydrofluoric acid; membrane dissolution; membrane weakening; membranes; Other agrochemicals used in plant protection (herbicides, fungicides, etc.); ozone; Phytopathology. Animal pests. Plant and forest protection; Pollution effects and side effects of agrochemicals on crop plants and forest trees. Other anthropogenic factors; Pollution effects. Side effects of agrochemicals; senescence; stomatal movement; Zea mays; Chlorophyll; Monocotyledones; Senescence; Zea mays; Stomatal conductance; Hydrogen Fluorides; Ozone; Plant leaf; Cereal crop; Pollutant; Phytotoxicity; Gramineae; Angiospermae; Spermatophyta
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/0269-7491(90)90135-Y

Maize ( Zea mays, L.) plants were exposed intermittently to O 3, HF or both pollutants and the progression of foliar senescence was followed by measuring chlorophyll loss, membrane breakdown and changes in stomatal conductance. At concentrations insufficient to cause foliar symptoms (0·06 μl O 3 litre −1 and 1·0 μg Fm −3), exposures to HF had little or no effect, whereas O 3 exposures accelerated the rate of senescence. The rapid rate of senescence produced by O 3 was moderated if the plants were also exposed to HF. Topical application of 6-benzyladenine (BA) prior to pollutant exposures delayed senescence in all plants and completely prevented the O 3-induced acceleration of senescence.