title: Effects of ozone on growth, net photosynthesis and yield of two  African varieties of Vigna unguiculata.
abstract: To assess the effects of O(3)on growth, net photosynthesis and yield of two African varieties of cowpea(Vigna unguiculata L.), Blackeye and Asontem were exposed as potted plants to air that was either filtered to remove O(3) (FA), non-filtered air (NF), non-filtered with added O3 of approximately 50 nL L(-1) (ppb) from 11:00 to 16:00 (NF + O(3)) for 88 days in open-top chambers. The mean O(3) concentration (11:00-16:00) during the exposure period had a range from 16 ppb in the FA treatment to 118 ppb in the NF + O(3) treatment. Net photosynthetic rate and leaf area per plant were significantly reduced by exposure to O(3), reducing the growth of both varieties. Exposure to O(3) significantly reduced the 100-seed weight and number of seeds per pod. As a result, cowpea yield was significantly reduced by long-term exposure to O(3), with no difference in sensitivity between the varieties.
authors.affiliation: United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
authors.forename: Rashied
authors.initials: R
authors.lastname: Tetteh
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamaguchi
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Wada
authors.forename: Ryo
authors.initials: R
authors.lastname: Funada
authors.forename: Takeshi
authors.initials: T
authors.lastname: Izuta
mesh_terms: D000393:Air Pollutants / Q000633:toxicity*; D007887:Fabaceae / Q000187:drug effects* / Q000502:physiology*; D005740:Gases; D010126:Ozone / Q000633:toxicity*; D010788:Photosynthesis / Q000187:drug effects*; D018515:Plant Leaves / Q000187:drug effects
chemical_list: D000393:Air Pollutants; D005740:Gases; D010126:Ozone