The influence of elevated C0<sub>2</sub>on growth and age-related changes in leaf gas exchange

Pearson, Mark; Brooks, G. L.

doi:10.1093/jxb/46.11.1651

Cited by 44 publications

(34 citation statements)

References 31 publications

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“…At this stage, plants appear to be better able to bene®t from available N whereas older plants cannot (Geiger et al 1998). Carbon-dioxide-induced increases in dry matter accumulation may be largely restricted to the early phases of growth (Neales and Nichols 1978;Pearson and Brooks 1995). Early dierences in growth are maintained beyond the juvenile stage, such that biomass is increased despite the absence of sustained enhancement of RGR (Wul and Strain 1981;Baxter et al 1994).…”

Section: Discussionmentioning

confidence: 99%

Acclimation of the summer annual species, Lolium temulentum , to CO 2 enrichment

Lewis

Peratoner

Cairns

et al. 1999

Planta

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Lolium temulentum L. Ba 3081 was grown hydroponically in air (350 &mgr;mol mol(-1) CO(2)) and elevated CO(2) (700 &mgr;mol mol(-1) CO(2)) at two irradiances (150 and 500 &mgr;mol m(-2) s(-1)) for 35 days at which point the plants were harvested. Elevated CO(2) did not modify relative growth rate or biomass at either irradiance. Foliar carbon-to-nitrogen ratios were decreased at elevated CO(2) and plants had a greater number of shorter tillers, particularly at the lower growth irradiance. Both light-limited and light-saturated rates of photosynthesis were stimulated. The amount of ribulose-1, 5-bisphosphate carboxylase-oxygenase (Rubisco) protein was increased at elevated CO(2), but maximum extractable Rubisco activities were not significantly increased. A pronounced decrease in the Rubisco activation state was found with CO(2) enrichment, particularly at the higher growth irradiance. Elevated-CO(2)-induced changes in leaf carbohydrate composition were small in comparison to those caused by changes in irradiance. No CO(2)-dependent effects on fructan biosynthesis were observed. Leaf respiration rates were increased by 68% in plants grown with CO(2) enrichment and low light. We conclude that high CO(2) will only result in increased biomass if total light input favourably increases the photosynthesis-to-respiration ratio. At low irradiances, biomass is more limited by increased rates of respiration than by CO(2)-induced enhancement of photosynthesis.

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Section: Discussionmentioning

confidence: 99%

Acclimation of the summer annual species, Lolium temulentum , to CO 2 enrichment

Lewis

Peratoner

Cairns

et al. 1999

Planta

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“…Recent data suggest that assimilation responses to CO 2 enrichment may be related to leaf development in many species (e.g., Porter and Grodzinski 1984;Besford et al 1990;Kelly et al 1991;Norby and O'Neill 1991;Pearson and Brooks 1995;Van Oosten and Besford 1995;Hikosaka 1996;Miller et al 1997). For example, Van Oosten and Besford (1995) found that after an initial increase in assimilation during early expansion, there was an accelerated ontogenetic decline in assimilation of tomato leaves grown at elevated compared to ambient CO 2 .…”

Section: Introductionmentioning

confidence: 99%

The fraction of expanding to expanded leaves determines the biomass response of Populus to elevated CO 2

et al. 1999

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We examined whether the effects of elevated CO on growth of 1-year old Populus deltoides saplings was a function of the assimilation responses of particular leaf developmental stages. Saplings were grown for 100 days at ambient (approximately 350 ppm) and elevated (ambient + 200 ppm) CO in forced-air greenhouses. Biomass, biomass distribution, growth rates, and leaf initiation and expansion rates were unaffected by elevated CO. Leaf nitrogen (N), the leaf C:N ratio, and leaf lignin concentrations were also unaffected. Carbon gain was significantly greater in expanding leaves of saplings grown at elevated compared to ambient CO. The Rubisco content in expanding leaves was not affected by CO concentration. Carbon gain and Rubisco content were significantly lower in fully expanded leaves of saplings grown at elevated compared to ambient CO, indicating CO-induced down-regulation in fully expanded leaves. Elevated CO likely had no overall effect on biomass accumulation due to the more rapid decline in carbon gain as leaves matured in saplings grown at elevated compared to ambient CO. This decline in carbon gain has been documented in other species and shown to be related to a balance between sink/source balance and acclimation. Our data suggest that variation in growth responses to elevated CO can result from differences in leaf assimilation responses in expanding versus expanded leaves as they develop under elevated CO.

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“…It is important to consider that the rate of photosynthesis is highly dependent on developmental stages and the response to CO 2 varies with the stage of development (e.g. Nie et al, 1995;van Oosten and Besford, 1995;van Oosten et al, 1995;Pearson and Brooks, 1995;Usuda and Shimogawara, 1998). For this reason, I examined the photosynthetic capacity of the fi rst leaf of plants at various developmental stages under ambient and elevated CO 2 .…”

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confidence: 99%

Effects of Growth under Elevated CO₂on the Capacity of Photosynthesis in Two Radish Cultivars Differing in Capacity of Storage Root

Usuda

2004

Plant Production Science

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The influence of elevated C0₂on growth and age-related changes in leaf gas exchange

Cited by 44 publications

References 31 publications

Acclimation of the summer annual species, Lolium temulentum , to CO 2 enrichment

Acclimation of the summer annual species, Lolium temulentum , to CO 2 enrichment

The fraction of expanding to expanded leaves determines the biomass response of Populus to elevated CO 2

Effects of Growth under Elevated CO₂on the Capacity of Photosynthesis in Two Radish Cultivars Differing in Capacity of Storage Root

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The influence of elevated C02on growth and age-related changes in leaf gas exchange

Cited by 44 publications

References 31 publications

Acclimation of the summer annual species, Lolium temulentum , to CO 2 enrichment

Acclimation of the summer annual species, Lolium temulentum , to CO 2 enrichment

The fraction of expanding to expanded leaves determines the biomass response of Populus to elevated CO 2

Effects of Growth under Elevated CO2on the Capacity of Photosynthesis in Two Radish Cultivars Differing in Capacity of Storage Root

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The influence of elevated C0₂on growth and age-related changes in leaf gas exchange

Effects of Growth under Elevated CO₂on the Capacity of Photosynthesis in Two Radish Cultivars Differing in Capacity of Storage Root