The effects of elevated CO 2 atmospheres on the nutritional quality of Eucalyptus foliage and its interaction with soil nutrient and light availability

Lawler, Ivan R.; Foley, William J.; Woodrow, Ian E.; Cork, Steven J.

doi:10.1007/s004420050058

Cited by 150 publications

(139 citation statements)

References 30 publications

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“…3b) is at odds with the findings of several other studies of both total phenolics and condensed tannins (e.g. Waterman et al 1984, Hartley et al 1995Lawler et al 1997;Koricheva et al 1998). These studies found a decrease in carbon-based compounds, which they attributed to the lower overall energy and carbon supply from photosynthesis in shaded plants.…”

Section: Discussionmentioning

confidence: 83%

Light alters the allocation of nitrogen to cyanogenic glycosides in Eucalyptus cladocalyx

2002

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Abstract. The effect of light on the partitioning of resources between photosynthesis and chemical defence was studied in Eucalyptus cladocalyx F. Muell. This species allocates up to 15% of leaf nitrogen to the constitutive cyanogenic glycoside, prunasin, making it an ideal system for studying resource allocation. By controlling the level of leaf nitrogen we were able to test the hypothesis that light limitation would result in the effective reallocation of nitrogen from the defensive to the photosynthetic apparatus. Seedlings were grown in full light or shade and supplied with 1.5 mM or 6 mM nitrogen in a 2 2 factorial design. We found that shading effected a decrease in the concentration of the cyanogenic glycoside, prunasin, and little if any change in the concentration of carbon-based secondary metabolites (total phenolics and condensed tannins). There was also significantly less prunasin, relative to total leaf nitrogen, chlorophyll concentration and carbon assimilation rates, when grown plants were grown in shade, particularly when there was an ample supply of nitrogen. This pattern is likely to be the result of relative changes in the energetic and resource costs of photosynthesis and defensive compounds at different photon flux densities.

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Section: Discussionmentioning

confidence: 83%

Light alters the allocation of nitrogen to cyanogenic glycosides in Eucalyptus cladocalyx

2002

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“…Extra C can also be diverted to secondary metabolites (Pen4 uelas et al, 1996 ;Lawler et al, 1997) and\or re-emitted as volatile compounds (Seufert et al, 1995 ;Johnson & Allen, 1996), which may be more convenient than the investment in stemwood in semi-arid environments such as the Mediterranean. This has also been observed for Quercus species at the Bossoleto CO # spring (Johnson et al, 1997).…”

Section: mentioning

confidence: 99%

Comparative stem‐growth rates of Mediterranean trees under background and naturally enhanced ambient CO₂ concentrations

Tognetti¹,

Cherubini²,

Innes³

2000

New Phytologist

145

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 Ring widths of five Mediterranean forest tree species (Arbutus unedo, Fraxinus ornus, Quercus cerris, Quercus ilexand Quercus pubescens) growing close to a natural source of CO # in Tuscany, Italy and at a nearby control site were compared. At the CO # -enriched site, trees have been growing for decades under elevated CO # concentrations. They originated from parent trees that also grew under elevated CO # in natural conditions, and they have been continuously exposed to elevated CO # throughout their growth. Tree-ring series from each of the species were prepared. Assigning calendar dates to rings was difficult but possible, and ring-width series were built for all species. The ring-width data were analysed using a two-sided t-test to assess if there was a difference between the radial growth at the CO # -enriched site and the control site. The cumulative basal area at the same cambial age at both sites was also compared using a Wilcoxon test. Radial growth of trees at the CO # -enriched site was not significantly different from growth at the control site. For each species, year by year, radial growth at the CO # -enriched site was tested against the control site and significant differences were found in only a few years ; these differences were not synchronous with extreme climatic events. The expected increase in above-ground productivity, as one of the ecosystem responses to increasing CO # during drought stress, was not observed in this Mediterranean woody plant community, despite being water-limited. Other resource limitations, such as low nutrient availability (common in the Mediterranean region), may have counteracted the positive effect of elevated CO # under drought stress, or trees may have acclimated to the high CO # .

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“…In addition, genetic variability provides raw material to gain an understanding of the potential evolutionary consequences of elevated CO # , to select for optimal genotypes, or to analyse the range of variation in CO # response independently of phylogenetic differences. It is also expected to alter plant-herbivore interactions (Fajer et al, 1989 ;Lawler et al, 1997) and decomposition processes (Cou# teaux et al, 1991 ;Cotrufo et al, 1994).…”

Section: mentioning

confidence: 99%

Leaf structure and chemical composition as affected by elevated CO₂: genotypic responses of two perennial grasses

1999

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Genotypic variability was studied in two Mediterranean grass species, Bromus erectus and Dactylis glomerata, with regard to the response to CO # of leaf total non-structural carbohydrate concentration ([TNC] lf ), specific leaf area (SLA), and leaf carbon and nitrogen concentrations ([C] lf and [N] lf , respectively). Fourteen genotypes of each species were grown together on intact soil monoliths at ambient and elevated CO # concentrations (350 and 700 µmol mol −" , respectively). In both species, the most consistent effect of elevated CO Key words : elevated CO # , intraspecific variability, nitrogen, specific leaf area, total non-structural carbohydrate. One of the most consistent long-term effects of elevated CO # on plants is on leaf structure and chemical composition (Luo et al., 1994 ;Poorter et al., 1997 ; Cotrufo et al., 1998). In most cases, elevated CO # increases leaf total non-structural carbohydrate concentration ([TNC] lf ) and decreases specific leaf area (SLA ; the ratio between leaf area and leaf biomass) and leaf N concentration expressed as dry mass ([N m ] lf ). Although these effects appear to be fairly general, there is considerable variation in their magnitude across species and environments (Ko$ rner & Miglietta, 1994 ;Luo et al., 1994 ;Ko$ rner et al., 1995 ;Poorter et al., 1997). At least part of the variability in SLA and [N m ] lf responses to elevated CO # arises from interspecific differences in TNC accumulation (Stulen et al., 1998). These differences can cause an increase in leaf thickness (Vu et al., 1989 ;Radoglou & Jarvis, 1990), one of the components of SLA, and an N *Author for correspondence (fax j33 4 67 41 21 38 ; e-mail roumet!cefe.cnrs-mop.fr).dilution. Recalculation of SLA on a structural dry mass basis (SLAst) resulted in total elimination of the CO # effect in many species Den Hertog et al., 1998), whereas in others the decrease persisted, suggesting additional changes in leaf anatomy (Den Hertog et al., 1996) # are compared at a given age could be the result of plants grown at elevated CO # being larger (Coleman et al., 1993). In addition, [N m ] lf is often negatively correlated

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The effects of elevated CO 2 atmospheres on the nutritional quality of Eucalyptus foliage and its interaction with soil nutrient and light availability

Cited by 150 publications

References 30 publications

Light alters the allocation of nitrogen to cyanogenic glycosides in Eucalyptus cladocalyx

Light alters the allocation of nitrogen to cyanogenic glycosides in Eucalyptus cladocalyx

Comparative stem‐growth rates of Mediterranean trees under background and naturally enhanced ambient CO₂ concentrations

Leaf structure and chemical composition as affected by elevated CO₂: genotypic responses of two perennial grasses

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The effects of elevated CO 2 atmospheres on the nutritional quality of Eucalyptus foliage and its interaction with soil nutrient and light availability

Cited by 150 publications

References 30 publications

Light alters the allocation of nitrogen to cyanogenic glycosides in Eucalyptus cladocalyx

Light alters the allocation of nitrogen to cyanogenic glycosides in Eucalyptus cladocalyx

Comparative stem‐growth rates of Mediterranean trees under background and naturally enhanced ambient CO2 concentrations

Leaf structure and chemical composition as affected by elevated CO2: genotypic responses of two perennial grasses

Contact Info

Product

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Comparative stem‐growth rates of Mediterranean trees under background and naturally enhanced ambient CO₂ concentrations

Leaf structure and chemical composition as affected by elevated CO₂: genotypic responses of two perennial grasses