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Titolo:
Foliar morphological and physiological plasticity in Picea abies and Abiesalba saplings along a natural light gradient
Autore:
Grassi, G; Bagnaresi, U;
Indirizzi:
Univ Bologna, Dipartimento Colture Arboree, I-40126 Bologna, Italy Univ Bologna Bologna Italy I-40126 lture Arboree, I-40126 Bologna, Italy
Titolo Testata:
TREE PHYSIOLOGY
fascicolo: 12-13, volume: 21, anno: 2001,
pagine: 959 - 967
SICI:
0829-318X(200108)21:12-13<959:FMAPPI>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTOSYNTHESIS-NITROGEN RELATIONS; SHADE TOLERANCE; SHOOT STRUCTURE; USE EFFICIENCY; ASSIMILATIVE SURFACE; NEEDLE MORPHOLOGY; ACER-SACCHARUM; CARBON GAIN; C-3 PLANTS; TREE SIZE;
Keywords:
A/Ci curves; leaf mass per area; light acclimation; nitrogen partitioning; silhouette area ratio;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
58
Recensione:
Indirizzi per estratti:
Indirizzo: Grassi, G Univ Bologna, Dipartimento Colture Arboree, Via Filippo Re 6, I-40126 Bologna, Italy Univ Bologna Via Filippo Re 6 Bologna Italy I-40126 ogna, Italy
Citazione:
G. Grassi e U. Bagnaresi, "Foliar morphological and physiological plasticity in Picea abies and Abiesalba saplings along a natural light gradient", TREE PHYSL, 21(12-13), 2001, pp. 959-967

Abstract

The role of morphological versus physiological foliar plasticity in the capacity for, and mechanisms of, photosynthetic acclimation was assessed in Picea abies (L. ) Karst. and Abies alba Mill. saplings in a forest gap-understory light gradient (relative irradiance, RI, ranging from 0.02 to 0.32). The species investigated showed a similar foliar morphological plasticity along the light gradient, at both the needle level (through alteration in leaf dry mass per area) and the shoot level (through alteration in the silhouette area ratio, e.g., shoot silhouette to projected needle area ratio). In both species chlorophyll (Chl) concentration on a mass basis decreased at increasing RI, but was independent of RI when expressed on an area basis. Incontrast, leaf N concentration on a mass basis was independent of RI, but was positively influenced by RI when expressed on an area basis. The parameters describing photosynthetic performance at low light (dark respiration rate, apparent quantum yield and light compensation point) suggest that Abies alba was better suited to maintain a positive carbon balance in shaded conditions. By contrast, parameters describing biochemical capacity at high light (maximum electron transport rate, J(max). and maximum ribulose-1,5-biphosphate carboxylation capacity, V-cmax) indicate that only Picea abies wascapable of acclimating physiologically to high photosynthetic photon flux densities (PPFDs) by increasing nitrogen partitioning to rubisco and V-cmax/mass, by increasing RI. These results support the hypothesis that interspecific differences in nitrogen partitioning within the photosynthetic apparatus may provide a mechanistic basis for species separation along a light gradient. The differences in photosynthetic plasticity observed are likely toinfluence regeneration patterns and habitat breadth of the species investigated. The limited ability of Abies alba saplings to exploit high-light conditions may be a competitive disadvantage in large canopy gaps and thus limit recruitment of this species to small gaps.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 19:11:01