Complex adjustments of photosynthetic potentials and internal diffusion conductance to current and previous light availabilities and leaf age in Mediterranean evergreen species <i>Quercus ilex</i>

Niinemets, Ülo; Cescatti, Alessandro; Rodeghiero, Mirco; Tosens, Tiina

doi:10.1111/j.1365-3040.2006.01499.x

Cited by 157 publications

(184 citation statements)

References 80 publications

(225 reference statements)

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“…Leaves of trees in a higher planting density usually suffer from lower light irradiance from the shading of among branches (Warren et al 2001). In this study, the lower g m in the high planting density was consistent with that found in previous studies (Piel et al 2002;Niinemets et al 2006;Flexas et al 2007;Warren et al 2007). In addition to g m , the decrease in the photosynthetic rate was usually caused by Table 3 The gas exchange parameters, chlorophyll pigment contents, and leaf Each value is the mean±SE (n=8).…”

Section: Discussionsupporting

confidence: 82%

“…Additionally, we found a low photosynthetic level at high densities, with nevertheless a relatively high C i , suggesting that the stomatal conductance was not the main limitation on photosynthesis (Tuzet et al 2003). Relative to the stomatal conductance, the mesophyll conductance was more sensitive to changes in the surroundings, such as shading (Niinemets et al 2006;Warren et al 2007;Flexas et al 2007Flexas et al , 2008 and drought (Duan et al 2009). Leaves of trees in a higher planting density usually suffer from lower light irradiance from the shading of among branches (Warren et al 2001).…”

Section: Discussionmentioning

confidence: 83%

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Continuous planting under a high density enhances the competition for nutrients among young Cunninghamia lanceolata saplings

Dong

Zhang

et al. 2015

Annals of Forest Science

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Abstract& Key message A high-density plantation inhibited growth and biomass accumulation of Cunninghamia lanceolata (Lamb.) Hook. saplings, as well as their photosynthesis. This inhibition was enhanced in a soil that had been previously planted with the same species. The main factors limiting photosynthesis and growth were leaf-level irradiance and nutrient availability, mainly of P and Mg. & Context The planting density and continuous planting greatly affect the photosynthesis and productivity of Chinese fir plantations. The effects of high density and of continuous plantations over several revolutions need be disentangled. & Aims In this study, the responses of C. lanceolata seedlings to a high planting density were tested. Two soils were compared: a soil from a secondary forest and one from a continuous Chinese fir plantation. The study focused on growth and the potential processes involved in deduced photosynthesis. & Methods C. lanceolata seedlings were planted in wooden boxes (100×100×50 cm) with high and low planting densities (16 vs 1 plant m −2 ) in two types of soil. & Results Under the high planting density, C. lanceolata showed less growth and biomass accumulation at the individual level and lower photosynthetic rate and instantaneous photosynthetic nutrient use efficiency (PNUE and PPUE) at the leaf level. These negative effects were larger in soils that have been continuously planted with Chinese fir. The low photosynthesis was related to low phosphorus and magnesium contents in the leaves, changes in the foliar N/P and chlorophyll a/b ratios, and the limitation of the mesophyll conductance. & Conclusions The study showed that a high planting density induced enhanced competition for nutrients (particularly for P and Mg) and that this competition is enhanced in soils from continuous plantations compared to soils from natural forests.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 83%

Continuous planting under a high density enhances the competition for nutrients among young Cunninghamia lanceolata saplings

Dong

Zhang

et al. 2015

Annals of Forest Science

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“…Increasing needle tissue density has lowered CO 2 concentration in intercellular spaces and probably increases mesophyll resistance to CO 2 that leads to a reduction of PNUE with A. alba needle age (Niinemets et al 2005(Niinemets et al , 2006. The other authors showed that mesophyll (internal) conductance to CO 2 (g i ) was correlated with the surface area of chloroplasts exposed to intercellular air space and g i decreased with leaf age which might also be expected in our study tree (Hanba et al 2001;Miyazawa and Terashima 2001).…”

Section: Discussionsupporting

confidence: 64%

Needle age dependence of photosynthesis along a light gradient within an Abies alba crown

Robakowski

Bielinis

2017

Acta Physiol Plant

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Age and shade effects on needle structure and photosynthesis were determined within a lower part of Abies alba crown along a horizontal increasing gradient of branches self-shading. It was hypothesized that a decrease in net CO 2 assimilation rate with increasing needles' age would be related to: (1) structural age-related changes in needles, (2) reduction of stomatal conductance, (3) nitrogen translocation from old to young needles, and (4) decrease in efficiency of photochemical processes. Leaf mass-to-area ratio increased non-linearly with needle age. In a needle cross section, distance between the vascular bundles decreased, and height of palisade parenchyma cells increased with age. The structural changes observed in our study might lead to an increase in internal resistance to CO 2 with greater needle age. Total needle nitrogen concentration linearly decreased with age due to dilution and/ or translocation to younger needles. When expressed per needle area, nitrogen content was reduced in 6-year-old needles compared with younger ones. Net CO 2 assimilation rate per needle area decayed and was accompanied by a decrease in transpiration and water and photosynthetic nitrogen use efficiency. Old needles maintained high photochemical efficiency which compensated to some extent for light deficit in their micro-light environments. Our results have suggested that there is a mechanism controlling the relation between efficiency of light and dark photosynthetic processes along the needle age and shade gradient in A. alba crown.Keywords Chlorophyll a fluorescence Á Leaf age Á Needle structure Á Nitrogen concentration Á Photosynthesis Á Silver fir

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“…The C i cut-off point was determined based on the method proposed by Ethier et al (2006). This method has been successfully used in several studies, showing a good agreement with other independent estimates of g m (Niinemets et al, 2006). Detailed and thorough evaluation of errors resulting from assuming an infinite g m when fitting the Farquhar et al (1980) model equations to A-C i curves are given in Ethier and Livingston (2004).…”

Section: Gas-exchange Measurements and Estimation Of Mesophyll Conducmentioning

confidence: 99%

Long-term acclimation of mesophyll conductance, carbon isotope discrimination and growth in two contrasting Picea asperata populations exposed to drought and enhanced UV-B radiation for three years

Duan

Fei

Zhang

et al. 2011

Agricultural and Forest Meteorology

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Complex adjustments of photosynthetic potentials and internal diffusion conductance to current and previous light availabilities and leaf age in Mediterranean evergreen species Quercus ilex

Cited by 157 publications

References 80 publications

Continuous planting under a high density enhances the competition for nutrients among young Cunninghamia lanceolata saplings

Continuous planting under a high density enhances the competition for nutrients among young Cunninghamia lanceolata saplings

Needle age dependence of photosynthesis along a light gradient within an Abies alba crown

Long-term acclimation of mesophyll conductance, carbon isotope discrimination and growth in two contrasting Picea asperata populations exposed to drought and enhanced UV-B radiation for three years

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