Variation of the photosynthetic capacity across a chronosequence 
of maritime pine correlates with needle phosphorus concentration

Delzon, Sylvain; Bosc, Alexandre; Cantet, Lisa; Loustau, Denis

doi:10.1051/forest:2005046

Cited by 27 publications

(18 citation statements)

References 39 publications

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“…In maritime pine, Ben Brahim et al [2] have reported that under moderate P deficiency (between 0.0013 and 0.0017 g P per g dry matter in plants), the lower plant growth was paralleled by a slower development of the foliage. Under more severe P deficiencies (between 0.0004 and 0.0013 g P per g dry biomass) a tight negative correlation was observed between phosphorus leaf concentration and photosynthetic capacity [15,34]. Our experiment was conducted in the intermediate range of P deficiencies, so that the absence of effect of P treatments on RUE is consistent with these results.…”

Section: Discussionsupporting

confidence: 75%

Interactive effects of phosphorus and light availability on early growth of maritime pine seedlings

Cheaib¹,

Mollier²,

Thunot³

et al. 2005

Ann. For. Sci.

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-We examined the response of early growth of maritime pine seedlings to combined levels of light and phosphorus. Seedlings were grown under three levels of phosphorous availability, i.e., two relative addition rates (RAR = 2 and 4 g P (100 g -1 )P d -1 ) and a free-access to P, crossed with two light levels (photosynthetic photon flux densities of 150 and 450 µmol m -2 s -1 , respectively). Relative growth rate (RGR) and relative uptake rate of phosphorus (RUR) were computed, as well as the amount of light absorbed per seedling. We found that phosphorus and light acted as limiting factors with a complex interaction. Under low light and at the lowest P level, P and light were co-limiting, i.e., growth was enhanced only when P and light were increased together. Light was the limiting factor for growth under low light conditions at all other levels of P availability. P was the limiting factor at a RAR of 2% under high light. Enhancing P from 4% to free access did not significantly improve growth under high light. RUR was controlled systematically by P availability at 2 and 4% RAR. RGR values were close to RUR values except under free access to P. Therefore, growth-independent accumulation of P was observed under high P conditions. The differences in biomass production among P treatments were explained primarily by the reduced amount of radiation intercepted by the seedlings as a consequence of their reduced leaf area. No effect of P treatments were observed on the calculated radiation-use efficiency (RUE), which was found to be larger under low light. This confirms that pine seedlings adjust to moderate phosphorus deficiency mainly by changing their morphology (leaf area, dry-mass partitioning) while biochemical and photochemical limitations of photosynthesis play only a very secondary role.phosphorus nutrition / shade / growth / Pinus pinaster Aït.Résumé -Interaction des effets de la disponibilité en phosphore et en lumière sur la croissance de jeunes plants de pin maritime. La croissance de jeunes plants de pin maritime a été suivie en chambre de culture à deux niveaux d'éclairement et trois de disponibilité en phosphore. Deux taux d'addition relatifs en P (RAR = 2 et 4 g P (100 g -1 P j -1 ) et un libre accès au P ont été appliqués en combinaison avec deux niveaux d'éclairement (150 et 450 µmol m -2 s -1 ). Le taux de croissance relatif (RGR) et le taux d'absorption relatif de P (RUR) ont été calculés. La surface foliaire, la quantité de rayonnement absorbé et l'efficience d'utilisation du rayonnement (RUE) ont aussi été estimés. Les disponibilités en phosphore et en lumière ont limité la croissance suivant un schéma d'interaction complexe. Au plus faible niveau d'éclairement et d'ajout en phosphore, les deux facteurs étaient co-limitants et la croissance n'était augmentée que lorsque les deux facteurs augmentaient simultanément. La lumière était le facteur limitant pour les traitements sous faible éclairement à tous les autres niveaux de disponibilité en P. Le phosphore était limitant pour des RAR de 2...

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Section: Discussionsupporting

confidence: 75%

Interactive effects of phosphorus and light availability on early growth of maritime pine seedlings

Cheaib¹,

Mollier²,

Thunot³

et al. 2005

Ann. For. Sci.

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“…Altitudinal increase in leaf nitrogen content has already been observed for other species (Cordell et al, 1998;Premoli and Brewer, 2007). Photosynthetic capacity tends to be positively related to higher values of foliar nitrogen and phosphorus due to increased levels of Rubisco and other N-containing constituents of the photosynthetic apparatus (Delzon et al, 2005;Field and Mooney, 1986;Marron et al, 2008). Moreover, only for beech, our results also suggest that at least part of the increase in maximum assimilation rate at high elevation may be attributed to a slight increase in stomatal conductance, implying an increase in CO 2 diffusion into the leaf.…”

Section: Discussionmentioning

confidence: 84%

Augmentation de la capacité photosynthétique avec l’altitude: mesures d’échanges gazeux à pressions partielles de CO2 ambiante et constante

et al. 2009

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Abstract• Because all microclimatic variables change with elevation, it is difficult to compare plant performance and especially photosynthetic capacity at different elevations. Indeed, most previous studies investigated photosynthetic capacity of low-and high-elevation plants using constant temperature, humidity and light but varying CO 2 partial pressures (P CO2 ).• Using gas exchange measurements, we compared here maximum assimilation rates (A max ) at ambient and constant-low-elevation P CO2 for two temperate tree species along an altitudinal gradient (100 to 1600 m) in the Pyrénées mountains.• Significant differences in A max were observed between the CO 2 partial pressure treatments for elevations above 600 m, the between-treatment differences increasing with elevation up to 4 µmol m −2 s −1 . We found an increase in A max with increasing elevation at constant-low-elevation P CO2 but not at ambient P CO2 for both species. Given a 10% change in P CO2 , a proportionally higher shift in maximum assimilation rate was found for both species.• Our results showed that high elevation populations had higher photosynthetic capacity and therefore demonstrated that trees coped with extreme environmental conditions by a combination of adaptation (genetic evolution) and of acclimation. Our study also highlighted the importance of using constant CO 2 partial pressure to assess plant adaptation at different elevations. Mots-clés :adaptation / acclimatation / gradient altitudinal / pression partielle / capacité photosynthétique Résumé -Augmentation de la capacité photosynthétique avec l'altitude : mesures d'échanges gazeux à pressions partielles de CO 2 ambiante et constante.• Les conditions microclimatiques étant très variables avec l'altitude, il est difficile de comparer les performances d'une espèce végétale à différentes altitudes, particulièrement la capacité photosynthé-tique. En effet, la plupart des études antérieures ont estimé le taux maximal d'assimilation à basses et hautes altitudes en maintenant la température, l'humidité de l'air et la lumière constantes mais en laissant varier la pression partielle de CO 2 (P CO2 ).• Afin de comparer le taux maximum d'assimilation (A max ) à pressions partielles de CO 2 constantes de basse altitude et variables, nous avons effectué des mesures d'échanges gazeux sur deux espèces d'arbres tempérés le long d'un gradient altitudinal de 1600 m de dénivelé dans les Pyrénées françaises.• La différence entre les deux traitements de P CO2 est significative au-dessus de 600 m d'altitude et atteint un maximum de 4 µmol m −2 s −1 . Pour les deux espèces, nous avons mis en évidence une augmentation de A max avec l'altitude à P CO2 constantes mais pas à P CO2 ambiantes. Pour une modification de P CO2 de 10 %, le changement du taux maximum d'assimilation est proportionnellement supérieur chez les deux espèces.• Nos résultats montrent que les populations de hautes altitudes possèdent une capacité photosynthétique supérieure, démontrant que les arbres font face aux conditions environnement...

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“…The age-dependent photosynthetic decrease has been attributed to the stronger difficulties for water flux that occur with increases in tree height and architectural complexity along with age, which promote lower stomatal conductance for CO 2 diffusion into intercellular spaces (Ryan and Yoder 1997;Bond 2000). Photosynthesis of older trees, however, has been observed to decrease even at relatively high intercellular CO 2 concentrations (Day et al 2001;Niinemets 2002; but see Delzon et al 2005), indicating that the biochemical potential for photosynthesis (i.e., non-stomatal limitations) may be constrained with age. Other studies suggest that photosynthetic decay on older trees may be part of a genetically controlled maturation process (Becker et al 2000;Bond 2000;Day et al 2001).…”

Section: Introductionmentioning

confidence: 96%

Gas exchange of juvenile and mature trees of Alnus jorullensis (Betulaceae) at sites with contrasting humidity in the Venezuelan Andes

Piper

Cavieres

2009

Ecological Research

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The reduction of photosynthetic rates with tree age has been proposed as a major driver of the productivity declination along ontogeny. It is not clear, however, how environmental humidity affects stomatal conductance and biochemical potential of photosynthesis in trees belonging to different age-classes. We assessed daily cycles of gas exchange on leaves of juvenile and mature individuals of the tropical high-elevation tree Alnus jorullensis Kunth (Betulaceae), at two sites with contrasting precipitation in the Venezuelan Andes. Photosynthesis and stomatal conductance were higher in juvenile trees during the morning and at noon in the mesic site, and were in general similar between ageclasses in the wet site. Under light-saturating conditions, the net photosynthetic rate was similar between the ageclasses at the wet site and higher for juvenile trees at the mesic site, whereas stomatal conductance did not differ between age-classes and was higher at the wet site. Daily cycles of gas exchange and a type II regression model between photosynthesis and intercellular CO 2 concentration indicated that the better performance of juvenile trees at the mesic site was due to lower non-stomatal limitations. These results support the proposal that nonstomatal limitations-rather than stomatal ones-are involved in the decay of photosynthesis in mature trees, and suggest that such limitations may be evident only under drier conditions.

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Variation of the photosynthetic capacity across a chronosequence of maritime pine correlates with needle phosphorus concentration

Cited by 27 publications

References 39 publications

Interactive effects of phosphorus and light availability on early growth of maritime pine seedlings

Interactive effects of phosphorus and light availability on early growth of maritime pine seedlings

Augmentation de la capacité photosynthétique avec l’altitude: mesures d’échanges gazeux à pressions partielles de CO2 ambiante et constante

Gas exchange of juvenile and mature trees of Alnus jorullensis (Betulaceae) at sites with contrasting humidity in the Venezuelan Andes

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