Crown architecture and leaf habit are associated with intrinsically different light-harvesting efficiencies in<i>Quercus</i>seedlings from contrasting environments

Esteso-Martínez, Jordán; Valladares, Fernando; Camarero, J. Julio; Gil‐Pelegrín, Eustaquio

doi:10.1051/forest:2006033

Cited by 12 publications

(7 citation statements)

References 38 publications

(55 reference statements)

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“…Such morphological leaf traits have been interpreted as adaptations to withstand summer drought (Morrow & Mooney, ; Poole & Miller, ; Baldocchi & Xu, ; Galmés et al ., ), given that water is the main limiting resource for plant growth in Mediterranean‐type climates (Di Castri, ; Rhizopoulou & Mitrakos, ; Mediavilla & Escudero, , ; Corcuera et al ., ). Thus, all the studied species show a reduced leaf area and thick leaves (Table ), resulting in high LMA values when compared with other oak species from temperate climates (Corcuera et al ., ; Esteso‐Martínez et al ., ). Furthermore, such convergence is common in the evergreen sclerophyllous vegetation typical for Mediterranean‐type climates.…”

Section: Discussionmentioning

confidence: 97%

Cell‐level anatomical characteristics explain high mesophyll conductance and photosynthetic capacity in sclerophyllous Mediterranean oaks

et al. 2017

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Leaf mass per area (LMA) has been suggested to negatively affect the mesophyll conductance to CO (g ), which is the most limiting factor for area-based photosynthesis (A ) in many Mediterranean sclerophyll species. However, despite their high LMA, these species have similar A to plants from other biomes. Variations in other leaf anatomical traits, such as mesophyll and chloroplast surface area exposed to intercellular air space (S /S and S /S), may offset the restrictions imposed by high LMA in g and A in these species. Seven sclerophyllous Mediterranean oaks from Europe/North Africa and North America with contrasting LMA were compared in terms of morphological, anatomical and photosynthetic traits. Mediterranean oaks showed specific differences in A that go beyond the common morphological leaf traits reported for these species (reduced leaf area and thick leaves). These variations resulted mainly from the differences in g , the most limiting factor for carbon assimilation in these species. Species with higher A showed increased S /S, which implies increased g without changes in stomatal conductance. The occurrence of this anatomical adaptation at the cell level allowed evergreen oaks to reach A values comparable to congeneric deciduous species despite their higher LMA.

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Section: Discussionmentioning

confidence: 97%

Cell‐level anatomical characteristics explain high mesophyll conductance and photosynthetic capacity in sclerophyllous Mediterranean oaks

et al. 2017

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“…Furthermore, these species are able to survive even in the most xeric areas of this territory (Martín-Albertos et al 1998). Stomatal closure occurs in these species at water potential close to -3 MPa (Mediavilla and Escudero 2003;Vilagrosa et al 2003), and leaf size and cuticular transpiration are lower than in other congener species from mesic habitats (Kerstiens 1996;Esteso-Martínez et al 2006b). However, these three species show a high resistance to drought-induced cavitation (Tyree and Cochard 1996;Vilagrosa et al 2003;Corcuera et al 2005) when compared with the resistance found in some Mediterranean deciduous oaks (Corcuera et al 2006;Esteso-Martínez et al 2006a) or temperate deciduous oaks (Tyree and Cochard 1996).…”

Section: Introductionmentioning

confidence: 83%

Differential photosynthetic performance and photoprotection mechanisms of three Mediterranean evergreen oaks under severe drought stress

Peguero‐Pina

Sancho‐Knapik

Morales

et al. 2009

Functional Plant Biol.

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The ability of three Mediterranean oaks (Quercus coccifera L., Quercus ilex ssp. ballota (Desf.) Samp and Quercus suber L.) to cope with intense drought was investigated. Water stress reduced stomatal conductance and photosynthesis in these species. Drought-mediated changes in photosynthetic-related parameters allowed the characterisation of the specific photo-protective mechanisms. Specifically, Q. suber downregulated photosynthetic electron transport rates (ETR) closing PSII reaction centres (i.e. decreasing photochemical quenching) and through an antheraxanthin (A) + zeaxanthin (Z)-mediated diminished intrinsic PSII efficiency (Φexc.). These changes were lower in Q. coccifera and Q. ilex ssp. ballota, which decreased further ETR photo-inactivating PSII centres (evidenced by their low predawn Fv/Fm ratios at high water stress). The predawn Fv/Fm ratio decreased in Q. coccifera largely due to Fm decreases, whereas in Q. ilex ssp. ballota Fv/Fm decreases were due to F0 increases, below –4 MPa. These Fv/Fm decreases were well correlated with increases in the A + Z photo-protective pigments. An analysis of dark respiration and photorespiration as alternative electron sinks under intense drought stress also revealed interspecific differences. The largest imbalance between electrons generated and consumed increased potentially oxidative damage in Q. suber. Subsequently, only Q. suber showed loss of chlorophyll, which is one of the main targets of oxidative damage. Data suggest that Q. coccifera and Q. ilex ssp. ballota seem more able than Q. suber to withstand highly xeric conditions. Therefore, our results question the consideration of Mediterranean evergreen oaks as a homogeneous physiological group.

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“…An increased LSC has been related to climate dryness, as implies a higher ability for supplying water to the transpiring leaves in dry atmospheres [113,114]. In spite of these benefits, the reduction in supported leaf area per shoot concomitant with a decrease in leaf size has negative consequences in terms of carbon gain through the effect on leaf area ratio (LAR) [115], a major driver of the relative growth rate (RGR) [116]. To clarify this question, we have compared total foliage area and LAR in oak species from Mediterranean and Temperate climates growing in a common garden.…”

Section: Leaf Size Reductionmentioning

confidence: 99%

Living in Drylands: Functional Adaptations of Trees and Shrubs to Cope with High Temperatures and Water Scarcity

Peguero‐Pina

Vilagrosa

Alonso-Forn

et al. 2020

Forests

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Plant functioning and survival in drylands are affected by the combination of high solar radiation, high temperatures, low relative humidity, and the scarcity of available water. Many ecophysiological studies have dealt with the adaptation of plants to cope with these stresses in hot deserts, which are the territories that have better evoked the idea of a dryland. Nevertheless, drylands can also be found in some other areas of the Earth that are under the Mediterranean-type climates, which imposes a strong aridity during summer. In this review, plant species from hot deserts and Mediterranean-type climates serve as examples for describing and analyzing the different responses of trees and shrubs to aridity in drylands, with special emphasis on the structural and functional adaptations of plants to avoid the negative effects of high temperatures under drought conditions. First, we analyze the adaptations of plants to reduce the input of energy by diminishing the absorbed solar radiation through (i) modifications of leaf angle and (ii) changes in leaf optical properties. Afterwards, we analyze several strategies that enhance the ability for heat dissipation through (i) leaf size reduction and changes in leaf shape (e.g., through lobed leaves), and (ii) increased transpiration rates (i.e., water-spender strategy), with negative consequences in terms of photosynthetic capacity and water consumption, respectively. Finally, we also discuss the alternative strategy showed by water-saver plants, a common drought resistance strategy in hot and dry environments that reduces water consumption at the expense of diminishing the ability for leaf cooling. In conclusion, trees and shrubs living in drylands have developed effective functional adaptations to cope with the combination of high temperature and water scarcity, all of them with clear benefits for plant functioning and survival, but also with different costs concerning water use, carbon gain, and/or leaf cooling.

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Crown architecture and leaf habit are associated with intrinsically different light-harvesting efficiencies inQuercusseedlings from contrasting environments

Cited by 12 publications

References 38 publications

Cell‐level anatomical characteristics explain high mesophyll conductance and photosynthetic capacity in sclerophyllous Mediterranean oaks

Cell‐level anatomical characteristics explain high mesophyll conductance and photosynthetic capacity in sclerophyllous Mediterranean oaks

Differential photosynthetic performance and photoprotection mechanisms of three Mediterranean evergreen oaks under severe drought stress

Living in Drylands: Functional Adaptations of Trees and Shrubs to Cope with High Temperatures and Water Scarcity

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