EFFECTS OF OZONE ON MEIOTIC CHROMOSOMES OFVICIA FABA

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Abstract
All tested levels of ozone [the principal phytotoxicant in photochemical smog] caused morphological damage to plants of V. faba L., but only the dose of 200 parts/100,000,000 for 4 or 8 h caused chromosomal damage in the microsporocytes. Significant chromosomal damage appeared 24 h after fumigation in metaphase I and anaphase I-telophase I but no significant damage was found in anaphase II-telophase II. Chromosomes may be more susceptible to ozone during early stages of meiosis than at later stages. Chromosomal damage was of 2 types: physiological, as suggested by chromosome stickiness and physical, as indicated by bridges, fragments and micronuclei.