title: [Photosynthetic acclimation to elevated CO2 in strawberry leaves grown at different levels of nitrogen nutrition].
abstract: Photosynthetic characteristics of strawberry (Fragaria ananassa Duch cv. 'Toyonoka') leaves grown in either elevated CO(2) (700 microL/L) or ambient CO(2) (390 microL/L), and at three levels of nitrogen nutrition (12 mmol/L, 4 mmol/L, 0.4 mmol/L) were studied. The results showed that for strawberry grown in 12 mmol/L nitrogen, P(n), maximal carboxylation rate (V(c, max)), maximal linear electron flow through photosystem II (J(max)), electron flow to the photosynthetic carbon reduction cycle (J(c)) and q(P) were all significantly higher in plants grown and measured at elevated CO(2) than for plants grown and measured at ambient CO(2) (Table 1 and 2, Fig. 2), which were due to a significant increase in J(c) exceeding any suppression of electron flow to the photorespiratory carbon oxidation cycle (J(o)). This increase in photochemistrical quenching with decreased non-photochemistrical quenching (q(N) or NPQ) at elevated CO(2) alleviated photoinhibition by high light (Table 2, Fig. 3). For plants grown at 4 mmol/L and 0.4 mmol/L nitrogen, P(n), V(c, max), J(c) and q(P) were all significantly lower in plants grown and measured at elevated CO(2) than for plants grown and measured at ambient CO(2) (Table 1 and 2, Fig. 2). Consistent with decreased photochemistrical quenching and increased non-photochemistrical quenching (q(N) or NPQ), for leaves grown at 4 mmol/L and 0.4 mmol/L nitrogen, the photoinhibition was aggravated by elevated CO(2) (Table 2, Fig. 3). Elevated CO(2) suppressed J(o) in leaves of plants grown at 12 mmol/L, 4 mmol/L and 0.4 mmol/L nitrogen (Fig. 2). The results above suggested that deficient nitrogen (4 mmol/L and 0.4 mmol/L nitrogen) and elevated CO(2) result in an acclimatory decrease of photosynthesis in leaves of plant grown in elevated CO(2).
authors.affiliation: Department of Horticulture, College of Agriculture and Biotechnoloy, Zhejiang University, Hangzhou 310029, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Xu
authors.forename: Yan-Ping
authors.initials: YP
authors.lastname: Guo
authors.forename: Shang-Long
authors.initials: SL
authors.lastname: Zhang
authors.forename: Wen-Sheng
authors.initials: WS
authors.lastname: Dai
authors.forename: Qing-Gong
authors.initials: QG
authors.lastname: Fu
mesh_terms: D000222:Adaptation, Physiological / Q000187:drug effects / Q000502:physiology; D002245:Carbon Dioxide / Q000378:metabolism / Q000494:pharmacology*; D004579:Electron Transport / Q000187:drug effects; D031985:Fragaria / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology; D009584:Nitrogen / Q000378:metabolism / Q000494:pharmacology*; D010788:Photosynthesis / Q000187:drug effects* / Q000502:physiology; D018515:Plant Leaves / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology
chemical_list: D002245:Carbon Dioxide; D009584:Nitrogen