title: Sweet potato [Ipomoea batatas (L.) Lam.] cultivated as tuber or leafy vegetable supplier as affected by elevated tropospheric ozone.
abstract: Sweet potato cultivars respond differently to elevated tropospheric ozone concentrations of ca. 130 mug m (-3), 8 h a day for 4 weeks, which affects their selection for cultivation. In the first cultivar presented here, an adequate leafy vegetable supplier, the ozone load resulted in a shift of biomass to maintain the canopy at the expense of tuber development. Starch content of leaves was reduced, indicating an impairment of quality, but carotenoid content remained stable. The second cultivar may be grown for tuber production. Although the ratio tuber/plant remained stable under ozone, tuber yield and its starch content were significantly reduced. The lower starch content indicated a worse quality for certain industrial processing, but it is desirable for chip production. Elevated tropospheric ozone concentrations also influenced free amino acids and macronutrient contents of tubers, but these modifications were of minor significance for tuber quality in the second cultivar.
authors.affiliation: Institute of Crop Science and Resource Conservation (INRES), Unit Tropical Crops, University of Bonn, Auf dem Hügel 6, D-53121 Bonn, Germany. Keutgen_N@yahoo.com
authors.forename: Norbert
authors.initials: N
authors.lastname: Keutgen
authors.forename: Anna J
authors.initials: AJ
authors.lastname: Keutgen
authors.forename: Marc J J
authors.initials: MJ
authors.lastname: Janssens
mesh_terms: D000596:Amino Acids / Q000032:analysis; D002338:Carotenoids / Q000032:analysis; D027723:Ipomoea batatas / Q000187:drug effects* / Q000254:growth & development*; D010126:Ozone / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry / Q000187:drug effects / Q000254:growth & development*; D035281:Plant Tubers / Q000737:chemistry / Q000187:drug effects / Q000254:growth & development*; D013213:Starch / Q000032:analysis
chemical_list: D000596:Amino Acids; D002338:Carotenoids; D010126:Ozone; D013213:Starch