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Titolo:
Is elevation of carbon dioxide concentration beneficial to seedling photosynthesis in the understory of tropical rain forests?
Autore:
Liang, NH; Tang, Y; Okuda, T;
Indirizzi:
Natl Inst Environm Studies, Ctr Global Environm Res, Tsukuba, Ibaraki 3058506, Japan Natl Inst Environm Studies Tsukuba Ibaraki Japan 3058506 i 3058506, Japan Natl Inst Environm Studies, Global Environm Div, Tsukuba, Ibaraki 3058506,Japan Natl Inst Environm Studies Tsukuba Ibaraki Japan 3058506 ki 3058506,Japan
Titolo Testata:
TREE PHYSIOLOGY
fascicolo: 14, volume: 21, anno: 2001,
pagine: 1047 - 1055
SICI:
0829-318X(200109)21:14<1047:IEOCDC>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONTRASTING SHADE TOLERANCE; LONG-TERM ELEVATION; FAR-RED RATIO; CO2 CONCENTRATIONS; LIGHT QUALITY; SPECTRAL QUALITY; ATMOSPHERIC CO2; FAGUS-CRENATA; GROWTH; TREES;
Keywords:
carboxylation activity; chlorophyll; leaf area; nitrogen; spectral quality; stomatal conductance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Liang, NH Natl Inst Environm Studies, Ctr Global Environm Res, Onogawa 16-2, Tsukuba, Ibaraki 3058506, Japan Natl Inst Environm Studies Onogawa 16-2 Tsukuba Ibaraki Japan 3058506
Citazione:
N.H. Liang et al., "Is elevation of carbon dioxide concentration beneficial to seedling photosynthesis in the understory of tropical rain forests?", TREE PHYSL, 21(14), 2001, pp. 1047-1055

Abstract

Cuttings of the southeast Asian tropical rain forest tree species, Pongamia pinnata (L. ) Pierre were raised in growth chambers providing a photosynthetic photon flux density (PPFD) of 60 mu mol m(-2) s(-1) with either a low or a high red:far-red light ratio (LR and HR, respectively). The chambers were supplied with air containing CO2 at a concentration of either 400 (LR4 and HR4, respectively) or 800 mu mol mol(-1) (HR8 and LR8, respectively). After 4 months, leaf morphology and photosynthetic characteristics were determined. Relative to HR4, the LR4 treatment increased leaf area and total chlorophyll concentration (Chl) by 24 and 25%, respectively, but reduced leafmass per unit area (LMA) by 19%. Elevated [CO2] significantly increased leaf area and LMA but did not affect Chl of LR or HR plants. Leaf nitrogen concentration was unaffected by the red:far-red light ratio but decreased significantly in seedlings in the elevated [CO2] treatment. Photosynthesis measured in situ under the growth conditions of ambient light and [CO2] (A(amb)) was 30% lower on an area basis and 14% lower on a mass basis in LR4 plants than in HR4 plants. Elevated [CO2] reduced the activity of ribulose-1,5-bisphosphate carboxylase/oxygenase and thus decreased light-saturated photosynthetic rate in both HR and LR plants. Elevated [CO2] increased mean leafarea and decreased respiration rates in both LR and HR plants. The LR8 plants had significantly higher A(amb) than LR4 plants, but similar A(amb) to HR8 plants.

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Documento generato il 01/10/20 alle ore 15:50:07