title: The response of rice grain quality to ozone exposure during growth depends on ozone level and genotype.
abstract: The effects of ozone exposure during the cropping season on rice grain quality were investigated in chamber experiments employing four ozone treatments (charcoal filtered air, ambient, 2× ambient, and 2.5× ambient concentration) and six genotypes. The concentrations of protein and lipids in brown rice increased significantly in response to ozone, while starch concentration and thousand kernel mass decreased. Other parameters, including the concentrations of iron, zinc, phenolics, stickiness and geometrical traits did not exhibit significant treatment effects. Total brown rice yield, protein yield, and iron yield were negatively affected by ozone. Numerous genotypic differences occurred in the response to ozone, indicating the possibility of optimizing the grain quality in high ozone environments by breeding. It is concluded that although the concentrations of two important macronutrients, proteins and lipids, increased in ozone treated grains, the implications for human nutrition are negative due to losses in total grain, protein and iron yield.
authors.affiliation: Institute of Crop Science and Resource Conservation (INRES) - Plant Nutrition, University of Bonn, Karlrobert-Kreiten Strasse 13, 53115 Bonn, Germany. mfrei@uni-bonn.de
authors.forename: Michael
authors.initials: M
authors.lastname: Frei
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Kohno
authors.forename: Stefan
authors.initials: S
authors.lastname: Tietze
authors.forename: Mario
authors.initials: M
authors.lastname: Jekle
authors.forename: Mohammed A
authors.initials: MA
authors.lastname: Hussein
authors.forename: Thomas
authors.initials: T
authors.lastname: Becker
authors.forename: Klaus
authors.initials: K
authors.lastname: Becker
mesh_terms: D000383:Agriculture; D000393:Air Pollutants / Q000633:toxicity*; D004305:Dose-Response Relationship, Drug; D005838:Genotype; D012275:Oryza / Q000187:drug effects / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D010126:Ozone / Q000633:toxicity*; D013045:Species Specificity
chemical_list: D000393:Air Pollutants; D010126:Ozone