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• W1978721874 abstract "Abstract Spring wheat cv. Minaret was grown to maturity under three carbon dioxide (CO 2 ) and two ozone (O 3 ) concentrations in open‐top chambers (OTC). Green leaf area index (LAI) was increased by elevated CO 2 under ambient O 3 conditions as a direct result of increases in tillering, rather than individual leaf areas. Yellow LAI was also greater in the 550 and 680 μmol mol –1 CO 2 treatments than in the chambered ambient control; individual leaves on the main shoot senesced more rapidly under 550 μmol mol –1 CO 2 , but senescence was delayed at 680 μmol mol –1 CO 2 . Fractional light interception ( f ) during the vegetative period was up to 26% greater under 680 μmol mol –1 CO 2 than in the control treatment, but seasonal accumulated intercepted radiation was only increased by 8%. As a result of greater carbon assimilation during canopy development, plants grown under elevated CO 2 were taller at anthesis and stem and ear biomass were 27 and 16% greater than in control plants. At maturity, yield was 30% greater in the 680 μmol mol –1 CO 2 treatment, due to a combination of increases in the number of ears per m –2 , grain number per ear and individual grain weight (IGW). Exposure to a seasonal mean (7 h d –1 ) of 84 nmol mol –1 O 3 under ambient CO 2 decreased green LAI and increased yellow LAI, thereby reducing both f and accumulated intercepted radiation by ≈ 16%. Individual leaves senesced completely 7–28 days earlier than in control plants. At anthesis, the plants were shorter than controls and exhibited reductions in stem and ear biomass of 15 and 23%. Grain yield at maturity was decreased by 30% due to a combination of reductions in ear number m –2 , the numbers of grains per spikelet and per ear and IGW. The presence of elevated CO 2 reduced the rate of O 3 ‐induced leaf senescence and resulted in the maintenance of a higher green LAI during vegetative growth under ambient CO 2 conditions. Grain yields at maturity were nevertheless lower than those obtained in the corresponding elevated CO 2 treatments in the absence of elevated O 3 . Thus, although the presence of elevated CO 2 reduced the damaging impact of ozone on radiation interception and vegetative growth, substantial yield losses were nevertheless induced. These data suggest that spring wheat may be susceptible to O 3 ‐induced injury during anthesis irrespective of the atmospheric CO 2 concentration. Possible deleterious mechanisms operating through effects on pollen viability, seed set and the duration of grain filling are discussed." @default.
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• W1978721874 date "1998-02-01" @default.
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• W1978721874 title "Growth, light interception and yield responses of spring wheat (<i>Triticum aestivum</i> L.) grown under elevated CO₂ and O₃ in open‐top chambers" @default.
• W1978721874 doi "https://doi.org/10.1046/j.1365-2486.1998.00112.x" @default.
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