Contribution of diffusional and non-diffusional limitations to midday depression of photosynthesis in Arbutus unedo L.

Grassi, Giacomo; Ripullone, Francesco; Borghetti, Marco; Raddi, Sabrina; Magnani, Federico

doi:10.1007/s00468-009-0355-7

Cited by 27 publications

(38 citation statements)

References 74 publications

(109 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6C). This seasonal variation of GP, TER and NEE is similar to that observed in other Mediterranean ecosystems (Xu & Baldocchi 2004, Allard et al 2008 where productivity rates are higher in spring followed by a strong summer reduction connected both to the stomatal and non-stomatal limitation to the photosynthesis (Galmés et al 2007, Grassi et al 2009) and to the drought semi-deciduous habitus of Cistus species (Werner et al 1999, De Dato et al 2013.…”

Section: Co 2 Flux Measurements In a Mediterranean Garriguesupporting

confidence: 85%

Canopy Chamber: a useful tool to monitor the CO2 exchange dynamics of shrubland

Guidolotti¹,

Dato²,

Liberati³

et al. 2017

iForest

View full text Add to dashboard Cite

A transient state canopy-chamber was developed to monitor CO2 exchange of shrubland ecosystems. The chamber covered 0.64 m 2 and it was modular with a variable height. Several tests were carried out to check the potential errors in the flux estimates due to leakages and the environment modifications during the measurements inside the chamber. The laboratory leakages test showed an error below 1% of the flux; the temperature increases inside the chamber were below 1.3 °C at different light intensity and small pressure changes. The radial blowers inside the chamber created different wind speed at different chamber height, with faster speed at the top of the chamber and the minimum wind speed that was recorded at soil level, preventing detectable effects on soil CO2 emission rates. Moreover, the chamber was tested for two years in a semi-arid Mediterranean garrigue, identifying a strong seasonality of CO2 fluxes with the highest rates during spring and lowest rates recorded during the hot dry non-vegetative summer.

show abstract

Section: Co 2 Flux Measurements In a Mediterranean Garriguesupporting

confidence: 85%

Canopy Chamber: a useful tool to monitor the CO2 exchange dynamics of shrubland

Guidolotti¹,

Dato²,

Liberati³

et al. 2017

iForest

View full text Add to dashboard Cite

show abstract

“…or maximum rate of electronic transport, J max ) might differ between well-watered and water-stressed plants (Flexas et al, 2006;Grassi et al, 2009). For an accurate estimation of V cmax and J max , we need to account for the mesophyll conductance of CO 2 .…”

Section: Aranda Et Al / Forest Systems (2012) 21(3) 405-417 406mentioning

confidence: 99%

“…Taking into account the absolute limitations to photosynthesis, it is clear that the main reduction was due to diffusional resistances, mainly through the stomata, accounting for over 50% of the photosynthetic decrease. Under moderate water stress, stomatal limitation of photosynthesis is thought to be the main restriction on carbon uptake (Lawlor andCornic, 2002, Medrano et al, 2002;Grassi and Magnani, 2005;Díaz-Espejo et al, 2007;Grassi et al, 2009). …”

Section: Diffusional Limitations To Photosynthesis Under Moderate Watmentioning

confidence: 99%

Stomatal and non-stomatal limitations on leaf carbon assimilation in beech (Fagus sylvatica L.) seedlings under natural conditions

et al. 2012

View full text Add to dashboard Cite

Limitations to diffusion and biochemical factors affecting leaf carbon uptake were analyzed in young beech seedlings (Fagus sylvtica L.) growing in natural gaps of a beech-wood at the southern limit of the species. Half of the seedlings received periodic watering in addition to natural rainfall to reduce the severity of the summer drought. Plant water status was evaluated by measuring predawn water potential. Basic biochemical parameters were inferred from chlorophyll fluorescence and photosynthesis-CO 2 curves (A-C c ) under saturating light. The curves were established on three dates during the summer months. The main variables studied included: stomatal and mesophyll conductance to CO 2 (g s and g m respectively), maximum velocity of carboxylation (V cmax ) and maximum electron transport capacity (J max ). The g m was estimated by two methodologies: the curve-fitting and J constant methosds.Seedlings withstood moderate water stress, as the leaf predawn water potential (Ψ pd ) measured during the study was within the range -0.2 to -0.5 MPa. Mild drought caused g s and g m to decrease only slightly in response to Ψ pd . However both diffusional parameters explained most of the limitations to CO 2 uptake. In addition, it should be highlighted that biochemical limitations, prompted by V cmax and J max , were related mainly to ontogenic factors, without any clear relationship with drought under the moderate water stress experienced by beech seedlings through the study.The results may help to further understanding of the functional mechanisms influencing the carbon fixation capacity of beech seedlings under natural conditions. Key words: diffusion limitations; stomatal conductance; mesophyll conductance; photosynthesis; drought; regeneration. Resumen Limitaciones estomáticas y no-estomáticas en la asimilación foliar de carbono en brinzales de haya (Fagus sylvatica L.) bajo condiciones naturalesLas limitaciones a la difusión de CO 2 y los factores bioquímicos que afectan la captura foliar de carbono fueron analizadas en jóvenes brinzales de haya (Fagus sylvtica L.) que crecían en un claro de un hayedo en el límite Sur de la distribución de la especie. La mitad de los brinzales recibieron periódicamente un riego adicional a la lluvia caída durante el verano con el objeto de minimizar la sequía estival. El grado de estrés hídrico soportado por las plantas fue evaluado a través de la medida del potencial hídrico al pre-alba (Ψ pd ). Los parámetros funcionales básicos que condicionan la fijación de carbono fueron inferidos a través de curvas de respuesta bajo luz saturante en las que se relaciona la tasa neta de fotosíntesis (A), y la concentración de CO 2 en el interior de los cloroplastos (C c ), en conjunción con medidas de fluorescencia de la clorofila. Dichas curvas se elaboraron en tres momentos a lo largo de los meses de verano, infiriéndose de las mismas: las conductancias estomáticas y del mesófilo al CO 2 (g s y g m respectivamente), la velocidad máxima de carboxilación (V cmax ) y la tasa máxima de tr...

show abstract

“…However, a high hydrophobicity at the underside of leaves may play a significant role in sustaining photosynthesis during the rainy season, which coincides with the flowering and fruiting period of these species, keeping the gas exchange of the hypostomatic leaves unimpeded (Lange, Tenhunen, and Beyschlag 1985;Harley, Tenhunen, and Lange 1986;Raschke and Resemann 1986;Vitale and Manes 2005;Holder 2007b;Grassi et al 2009); also, a hydrophobic adaxial leaf surface minimizes cuticular transpiration during the dry season.…”

Section: Discussionmentioning

confidence: 99%

Leaf surface wettability and fatty acid composition ofArbutus unedoandArbutus andrachnegrown under ambient conditions in a natural macchia

Koukos

Meletiou-Christou

Rhizopoulou

2015

Acta Botanica Gallica

View full text Add to dashboard Cite

Features of the adaxial and abaxial surface microstructure of Arbutus unedo L. and Arbutus andrachne L. are evaluated as possible consistent parameters contributing to the wetness of leaves. The abaxial leaf surface of A. andrachne and A. unedo was determined to be more hydrophobic than the adaxial leaf surface. Hydrophobicity may be of particular importance for the ecophysiological status of the hypostomatic leaves of both Arbutus species, which exhibit a long lifespan and are exposed to various environmental stimuli. Water repellence may also be correlated to the increased presence of surface wax. Lipid analysis of the leaves of both plant species revealed an abundance of α-linolenic acid, with palmitic acid as the second major contributor, followed by linoleic and oleic acid. Oleic and linoleic acid were present in slightly larger percentages in A. andrachne compared with A. unedo, whereas myristic, palmitic and α-linolenic acids were found in elevated percentages in A. unedo. The fatty acid composition analysis of the leaf wax of A. andrachne and A. unedo ranged from C16 to C26, with fatty acids of an even longer chain length detected in the case of A. andrachne. Despite the similar fatty acid composition of total lipids, the composition of the wax fraction showed differences between the two Arbutus species, which may partly contribute to the foliar surface properties of the two species.

show abstract

Contribution of diffusional and non-diffusional limitations to midday depression of photosynthesis in Arbutus unedo L.

Cited by 27 publications

References 74 publications

Canopy Chamber: a useful tool to monitor the CO2 exchange dynamics of shrubland

Canopy Chamber: a useful tool to monitor the CO2 exchange dynamics of shrubland

Stomatal and non-stomatal limitations on leaf carbon assimilation in beech (Fagus sylvatica L.) seedlings under natural conditions

Leaf surface wettability and fatty acid composition ofArbutus unedoandArbutus andrachnegrown under ambient conditions in a natural macchia

Contact Info

Product

Resources

About