Light acclimation of leaf gas exchange in two Tunisian cork oak populations from contrasting environmental conditions

Rzigui, Touhami; Khiari, Houyem; Abbes, Zouhaier; Baaziz, Khaoula Ben; Jaouadi, Ichrak; Nasr, Z.

doi:10.3832/ifor1306-007

Cited by 4 publications

(2 citation statements)

References 40 publications

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“…In Tunisia, Staudt et al (2008) examined the release of volatile organic compounds during drought in Tunisian cork oak populations from contrasting climatic conditions. More recently, Rzigui et al (2015Rzigui et al ( , 2017 used seedlings from Feija and Gaâfour provenances to show the intra-specific variability of cork oak in response to high light. Several studies examined the intraspecific variability in the Tunisian cork oak forest, mainly concerning the seasonal variability of gas exchange (Nasr et al 2015, Ben Fradj 2016.…”

Section: Intraspecific Differences In Response To the Droughtmentioning

confidence: 99%

Drought tolerance in cork oak is associated with low leaf stomatal and hydraulic conductances

Rzigui¹,

Jazzar²,

Khaoula³

et al. 2018

iForest

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Biogeosciences and Forestry Biogeosciences and Forestry Drought tolerance in cork oak is associated with low leaf stomatal and hydraulic conductancesTouhami Rzigui (1-2) , Latifa Jazzar (1) , Khaoula Ben Baaziz (1) , Sondes Fkiri (1) , Zouheir Nasr (1) To investigate the role of seeds origin in drought tolerance, the response to water deprivation of cork oak seedlings differing in climatic conditions at their geographical origin was compared. Gaâfour is the provenance from the driest site and Feija is the provenance from the wettest site. Net photosynthesis (An), stomatal conductance (gs) and leaf water potential were measured during dehydration. A delayed decrease in leaf water potential is observed after water withholding in Gaâfour as compared to Feija leaves. At the onset of dehydration, An and gs were higher in Feija. After withholding watering, Gaâfour leaves were able to maintain a higher An and gs than Feija leaves. Most likely, drought tolerance in Gaâfour leaves is associated to their lower gs under wellhydrated conditions. The stomatal density (Ds) and specific leaf area (SLA) were not different in well-watered leaves but, leaf hydraulic conductance was lower in Gaâfour leaves when compared to Feija leaves. Our results suggested that lower stomatal and hydraulic conductances of Gaâfour leaves could be involved in bringing about the better resistance to dehydration.

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Section: Intraspecific Differences In Response To the Droughtmentioning

confidence: 99%

Drought tolerance in cork oak is associated with low leaf stomatal and hydraulic conductances

Rzigui¹,

Jazzar²,

Khaoula³

et al. 2018

iForest

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“…For comparison, the Levenberg-Marquardt (LM) algorithm, a derivative based local optimization method, was also applied to estimate parameters of the photosynthetic models. The raw data of species 2, 5–9, 14–17, 20 and 22 (see Supplementary Table S4 ) were extracted from figures in publications 25 26 27 28 29 30 31 32 33 34 35 36 using the GetData Graph Digitizer 2.26 ( http://getdata-graph-digitizer.com ). After 500 iterations, the estimates from the three optimization methods were used to evaluate their performance.…”

Section: Methodsmentioning

confidence: 99%

A general method for parameter estimation in light-response models

Chen

Hui

et al. 2016

Sci Rep

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Selecting appropriate initial values is critical for parameter estimation in nonlinear photosynthetic light response models. Failed convergence often occurs due to wrongly selected initial values when using currently available methods, especially the kind of local optimization. There are no reliable methods that can resolve the conundrum of selecting appropriate initial values. After comparing the performance of the Levenberg–Marquardt algorithm and other three algorithms for global optimization, we develop a general method for parameter estimation in four photosynthetic light response models, based on the use of Differential Evolution (DE). The new method was shown to successfully provide good fits (R2 > 0.98) and robust parameter estimates for 42 datasets collected for 21 plant species under the same initial values. It suggests that the DE algorithm can efficiently resolve the issue of hyper initial-value sensitivity when using local optimization methods. Therefore, the DE method can be applied to fit the light-response curves of various species without considering the initial values.

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Leaf gas exchange variation under summer drought in Tunisian cork oak from geographically central and marginal populations

Jazzar

Rzigui

Fradj

et al. 2019

Euro-Mediterr J Environ Integr

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Light acclimation of leaf gas exchange in two Tunisian cork oak populations from contrasting environmental conditions

Cited by 4 publications

References 40 publications

Drought tolerance in cork oak is associated with low leaf stomatal and hydraulic conductances

Drought tolerance in cork oak is associated with low leaf stomatal and hydraulic conductances

A general method for parameter estimation in light-response models

Leaf gas exchange variation under summer drought in Tunisian cork oak from geographically central and marginal populations

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