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Titolo:
Responses of photosynthesis and biomass allocation of an understorey herb,Pteridophyllum racemosum, to gradual increases in irradiance
Autore:
Tani, T; Kudoh, H; Kachi, N;
Indirizzi:
Tokyo Metropolitan Univ, Grad Sch Sci, Dept Biol Sci, Tokyo 1920397, JapanTokyo Metropolitan Univ Tokyo Japan 1920397 ol Sci, Tokyo 1920397, Japan
Titolo Testata:
ANNALS OF BOTANY
fascicolo: 3, volume: 88, anno: 2001,
pagine: 393 - 402
SICI:
0305-7364(200109)88:3<393:ROPABA>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
CANOPY GAP FORMATION; RAIN-FOREST SHRUBS; ALOCASIA-MACRORRHIZA; LIGHT ENVIRONMENTS; WATER RELATIONS; DECIDUOUS FOREST; VAPOR-PRESSURE; LEAF ANATOMY; WHOLE-PLANT; ACCLIMATION;
Keywords:
biomass allocation; photosynthesis; Pteridophyllum racemosum; root mass per unit leaf area; wave regeneration;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
62
Recensione:
Indirizzi per estratti:
Indirizzo: Tani, T Tokyo Metropolitan Univ, Grad Sch Sci, Dept Biol Sci, Tokyo 1920397, Japan Tokyo Metropolitan Univ Tokyo Japan 1920397 Tokyo 1920397, Japan
Citazione:
T. Tani et al., "Responses of photosynthesis and biomass allocation of an understorey herb,Pteridophyllum racemosum, to gradual increases in irradiance", ANN BOTANY, 88(3), 2001, pp. 393-402

Abstract

In wave-regenerating Abies forests in central Japan, light availability onthe forest floor of a mature-tree stand increases gradually over 4 to 5 years during the senescence of trees. The understorey evergreen perennial Pteridophyllum racemosum Sieb. et Zucc. (Papaveraceae) is commonly found in such forests. To determine the acclimation characteristics of this species togradual changes in light availability, leaf photosynthetic traits and biomass allocation patterns were determined along a transect running from fullyshaded understorey to a canopy gap. Along the transect, the photon flux density on the forest floor relative to full sun (RPFD) varied from 2.3-36.7 %. The light-saturated net photosynthetic rate of field-grown plants increased as the light environment increased from 2.3-14.1 % RPFD. However, as light conditions increased from moderate (14.1 %) to high (36.7 %), the light-saturated net photosynthetic rate decreased to a level comparable to that exhibited by low-light grown plants. On the other hand, root mass per unit leaf area (RMA) increased with increasing light conditions. A higher RMA contributes to a higher water uptake capacity per unit leaf area which in turn supports higher rates of photosynthesis and transpiration in high light. We conclude that in wave-regenerating forests P. racemosum can survive in high-light environments by avoiding a severe water deficit and heat load by increasing RMA. (C) 2001 Annals of Botany Company.

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Documento generato il 29/09/20 alle ore 22:52:52