Higher Plant Respiration and Its Relationships to Photosynthesis

Amthor, Jeffrey S.

doi:10.1007/978-3-642-79354-7_4

Cited by 45 publications

(33 citation statements)

References 124 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Whether DR does continue in the light in photosynthetic tissue is still uncertain (Raven 1984, Amthor 1994) but the balance of opinion is that it does not. One indicator of DR suppression is the Kok eect (Kok 1948) where there is very high quantum eciency for CO 2 ®xation at PFDs below the compensation point.…”

Section: Discussionmentioning

confidence: 97%

An assessment of the relationship between chlorophyll a fluorescence and CO 2 gas exchange from field measurements on a moss and lichen

Green

Schroeter

Kappen

et al. 1998

Planta

View full text Add to dashboard Cite

The relationship between CO 2 exchange and relative electron-transport rate through photosystem II (ETR, measured using chlorophyll a¯uorescence) was determined for a moss and a green algal lichen, photobiont probably Trebouxia sp., in the ®eld in Antarctica. Net photosynthesis (NP) and dark respiration (DR) were measured over temperatures from zero to 25°C and gross photosynthesis (GP) calculated (GP NP + DR). The strong response of DR to temperature in these organisms resulted in substantial changes in CO 2 exchange rates. The moss Bryum argenteum Hedw. showed a strong, linear relationship between GP and ETR. This was an unexpected result since mosses are C 3 plants and, in higher plants, this group normally has a curvilinear GP versus ETR relationship. It is suggested that suppression of DR in the light might be involved. The lichen, Umbilicaria aprina Nyl., had nonlinear relationships between ETR and GP that were dierent at each measurement temperature. In some cases the lowest ETR was at the higher CO 2 exchange rates. It is suggested that these relationships are the result of strong quenching mechanisms that are inversely proportional to GP. The results support a growing impression that the relationships between ETR and CO 2 exchange are complex in these organisms and dierent from those found for higher plants.Abbreviations: Chl chlorophyll; DR dark respiration rate; ETR relative electron-transport rate through photosystem II ( F PSII´P FD); Fo¢ minimal¯uorescence in the light using far-red light to induce PSI activity; Fm¢ maximal¯uorescence in the light; Ft ¯uorescence in the light; GP gross photosynthetic rate (NP + DR); NP net photosynthetic rate; PFD photon¯ux density; qN non-photochemical chlorophyll¯uo-rescence quenching; qP photochemical chlorophyll¯uorescence quenching; F CO 2 quantum yield of CO 2 -®xation; F PSII the eective quantum yield of photosystem II (F PSII DF/Fm¢; variable¯uorescence, DF [Fm¢-Ft], divided by maximal¯uores-cence, Fm¢ measured during, or immediately after, illumination)

show abstract

Section: Discussionmentioning

confidence: 97%

An assessment of the relationship between chlorophyll a fluorescence and CO 2 gas exchange from field measurements on a moss and lichen

Green

Schroeter

Kappen

et al. 1998

Planta

View full text Add to dashboard Cite

show abstract

“…Respiration is needed to produce energy and carbon skeletons to sustain plant growth, maintenance, transport, and nutrient assimilation processes (e.g. Amthor 1994).…”

Section: Stem Respirationmentioning

confidence: 99%

Ecology and ecophysiology of tree stems: corticular and wood photosynthesis

Pfanz

Aschan

Langenfeld-Heyser

et al. 2002

Naturwissenschaften

251

View full text Add to dashboard Cite

Below the outer peridermal or rhytidomal layers, most stems of woody plants possess greenish tissues. These chlorophyll-containing tissues (the chlorenchymes) within the stems are able to use the stem internal CO2 and the light penetrating the rhytidome to photoassimilate and produce sugars and starch. Although net photosynthetic uptake of CO2 is rarely found, stem internal re-fixation of CO2 in young twigs and branches may compensate for 60-90% of the potential respiratory carbon loss. Isolated chlorenchymal tissues reveal rather high rates of net photosynthesis (being up to 75% of the respective rates for leaf photosynthesis). Corticular photosynthesis is thus thought to be an effective mechanism for recapturing respiratory carbon dioxide before it diffuses out of the stem. Furthermore, chloroplasts of the proper wood or pith fraction also take part in stem internal photosynthesis. Although there has been no strong experimental evidence until now, we suggest that the oxygen evolved during wood or pith photosynthesis may play a decisive role in avoiding/reducing stem internal anaerobiosis.

show abstract

“…The assumption that daylight leaf respiration equals night respiration is questionable, because dark respiration varies between night and daylight hours [4]. However, no quantitative information regarding a possible daylight increase at the stand level could be found.…”

Section: Respirationmentioning

confidence: 99%

Carbon balance and tree growth in a Fagus sylvatica stand

et al. 2000

View full text Add to dashboard Cite

-The objectives of this study were 1) to scale photosynthesis from leaf to crown and to tree scale, 2) to determine the proportion of assimilated carbon used for wood construction and whether the fraction of assimilation used for production varies among social classes and 3) to validate the approach by comparing assimilation estimates with independent measurements provided by the eddy covariance technique (EC). Measurements (growth and gas exchange) were performed in a 30-year-old Fagus sylvatica stand during the 1997 growing season on five sample trees of different crown classes (dominant, codominant and intermediate trees). A nonlinear relationship between net CO 2 assimilation and photosynthetically active radiation (PAR) was found for each sample trees. Canopy net CO 2 assimilation was then modelled over a period of non limiting soil water soil water content. Simulated gross assimilation scaled to stand level was in good agreement with stand measurements performed by EC. growth / carbon balance / photosynthesis / crown class / Fagus sylvatica L Résumé -Bilan de carbone et croissance dans un jeune peuplement de Fagus sylvatica. Les objectifs de cette étude étaient 1) d'estimer la photosynthèse à l'échelle de la couronne, puis à l'échelle de l'arbre à partir de mesures foliaires, 2) de déterminer la proportion du carbone assimilé utilisée pour la construction de bois et sa variation en fonction du statut social de l'arbre, 3) de valider l'estimation de l'assimilation en la comparant à une mesure indépendante (technique des corrélations turbulentes, EC). Les mesures (croissance et échanges gazeux) ont été effectuées pendant la saison de végétation 1997 sur cinq hêtres de 30 ans de statuts sociaux différents (dominant, codominant et dominé). Une relation non linéaire entre l'assimilation nette de CO 2 et le rayonnement photosynthetiquement actif (PAR) a été établie pour chaque arbre échantillon. L'assimilation nette de CO 2 à l'échelle de la couronne a ensuite été estimée pour une période sans stress hydrique. L'estimation de l'assimilation brute à l'échelle du peuplement à partir de mesures foliaires est en bon accord avec des mesures effectuées à l'échelle du peuplement par EC. croissance / bilan de carbone / photosynthèse / statut social / Fagus sylvatica L

show abstract

Higher Plant Respiration and Its Relationships to Photosynthesis

Cited by 45 publications

References 124 publications

An assessment of the relationship between chlorophyll a fluorescence and CO 2 gas exchange from field measurements on a moss and lichen

An assessment of the relationship between chlorophyll a fluorescence and CO 2 gas exchange from field measurements on a moss and lichen

Ecology and ecophysiology of tree stems: corticular and wood photosynthesis

Carbon balance and tree growth in a Fagus sylvatica stand

Contact Info

Product

Resources

About