Impacts of water stress on gas exchange, water relations, chlorophyll content and leaf structure in the two main Tunisian olive (Olea europaea L.) cultivars

Guerfel, Mokhtar; Baccouri, Olfa; Boujnah, Dalenda; Chaïbi, Wided; Zarrouk, Mokhtar

doi:10.1016/j.scienta.2008.08.006

Cited by 283 publications

(188 citation statements)

References 40 publications

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“…This is also relevant in terms of physiology, since chlorophyll is the pigment responsible for light absorption. Guerfel et al (2009) observed that shaded plants exhibited higher chlorophyll content, which was attributed to the strategy developed by the plants to increase the amount of pigment necessary to absorb radiation. Even though the higher SPAD index in shaded leaves in AGP were associated with a lower incident PAR 30 and 50 days after the final rainfall, the effects on the chlorophyll obtained here cannot be explained directly by incident radiation, since PAR in sun leaves was higher in AGP, and also exhibited a higher SPAD index.…”

Section: Discussionmentioning

confidence: 99%

Ecophysiology of deciduous plants grown at different densities in the semiarid region of Brazil

Mendes¹,

Lacerda²,

Fernandes³

et al. 2013

Theor. Exp. Plant Physiol.

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Physiological differences in the Cordia oncocalyx tree growing at different densities in two distinct areas were investigated.An agrosilvopastoral system (AGP) and a secondary forest (SF) were studied. Under both types of land-use, C. oncocalyx presented a relative frequency of approximately 50%, and absolute densities of 670 and 80 individuals per hectare, respectively. Net photosynthesis (A), stomatal conductance (g s ), and transpiration (E) were measured, and the SPAD index was recorded in sun leaves from the canopy and shade leaves from the lower canopy, in both the wet and dry seasons. We quantified the dry biomass of leaves and fruit on a per-tree basis at the end of the wet season. Net photosynthesis was higher in shaded leaves in the AGP in the wet season, reaching an average of 4.8 µmol m -2 s -1 against 3.2 µmol m -2 s -1 under SF. As trees began to shed their leaves at the beginning of the dry season and more radiation reached the shaded leaves, there was an increase in SF for A, depending on the intensity of light reaching the leaves. In the sun leaves, gas exchange was similar for the land-use systems during the wet season, but stronger in AGP than under SF during the dry season. This happened when the leaves in AGP retained more relative water content during a period of low gravimetric levels of the soil water. The lower tree density in AGP promoted a higher SPAD index and dry biomass in both the sun and shaded leaves, and allowed greater A, E and g s rates in the sun leaves at the beginning of the dry period.

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Section: Discussionmentioning

confidence: 99%

Ecophysiology of deciduous plants grown at different densities in the semiarid region of Brazil

Mendes¹,

Lacerda²,

Fernandes³

et al. 2013

Theor. Exp. Plant Physiol.

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“…Using the insects' feeding particularity, Nardini et al [22] demonstrated that the two main parenchyma of the leaf (palisade and spongy) played different roles in leaf hydraulic resistance. Changes in cell size in response to drought have already been reported in various species [23][24][25]. These effects of drought stress can be effectively monitored using NMR (nuclear magnetic resonance) relaxometry.…”

Section: Introductionmentioning

confidence: 99%

Leaf Development Monitoring and Early Detection of Water Deficiency by Low Field Nuclear Magnetic Resonance Relaxation in Nicotiana tabacum Plants

et al. 2018

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Drought is the main abiotic stress worldwide affecting harvest quality and quantity of numerous crops. To enable better water management, low field NMR (nuclear magnetic resonance) relaxometry was assessed as a developmental marker and a new method for early detection of water deficiency. The effect of a foliar biostimulant against water stress was also investigated. Two leaves of different ranks (four and eight) were studied. The leaves of different ranks were characterized by different NMR T 2 spectra which validated the ability of NMR to describe the developmental stage of tobacco. Results also showed that T 2 NMR relaxation spectra allow the detection of mild water stress (80% of the field capacity) through the precise characterization of the leaf water status while other water stress markers (relative water content, photosynthetic related parameters . . . )were not yet impacted. The agricultural impact of the mild water stress was determined through the nitrogen rate in shoots and amino acids assay six weeks after the beginning of the stress and results shows that foliar application of biostimulant limits the negative consequences of drought. Our results demonstrate the sensitivity of NMR to detect slight changes triggered in the leaf by water stress at the tissue level.

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“…As presented by Khaleghi et al (2012), Kiani et al (2008) and Guerfel et al (2009), chlorophyll content (Chla, Chlb and total chlorophyll = Chla + Chlb) decreased under stress elicited by water toxicity. These statements can explain why the content of chlorophylls and carotenoids increased in the presence of free available chlorine in the concentrations used during our experiments with three disinfectant products.…”

Section: Resultsmentioning

confidence: 68%

Plant stress activated by chlorine from disinfectants prepared on the base of sodium hypochlorite

Fargašová¹

2017

Nova Biotechnologica Et Chimica

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In this study, the phytotoxicity of disinfectants prepared on the base of sodium hypochlorite was determined. For our tests two commercial products, Savo and Dom Amor, as well as 10% NaClO solution were used. While Savo contained only NaClO, Dom Amor contained NaClO and earthworm enzymes. Products on the base of NaClO are used in households for cleaning and disinfection of floors, furniture, sanitary and kitchen equipment. Savo may be used for the disinfection of drinking waters as well. Products with NaClO are also used for bacteria, algae and pathogens reduction in irrigation waters. As a subject, young seedlings of mustard Sinapis alba L. were used for the study of chronic toxicity. The observed parameters of the inhibition of roots and shoots growth, dry (DM) and fresh (FM) mass as well as photosynthetic pigments production (chlorophyll a, b, carotenoids) and water content in the plants were determined. The results point out that Dom Amor was the most toxic for S. alba seedlings growth and the rank order of the FAC contents for both plant parts was arranged as: Dom Amor > Savo > NaClO. All disinfectants reduced the DM and FM of roots; however, they stimulated biomass production in the shoots. On the basis of the obtained results it could be concluded, that disinfectants stimulated photosynthetic pigments production and reduced water content mainly in the roots. Dom Amor did not significantly reduced the water content in the shoots and for this parameter the following rank orders of inhibition for roots and shoots could be arranged as NaClO > Dom Amor > Savo and NaClO > Savo > Dom Amor, respectively. All commercial products increased chlorophyll a (Chla) and the carotenoids (Car) content in the shoots. As significant increase was confirmed first for Chla whose content in the presence of NaClO at concentration 24 mL/L overextended that in the control by 3.5 times. The rank orders of stimulation for Chla and Car were NaClO > Savo > Dom Amor and Dom Amor > NaClO > Savo, respectively.

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Impacts of water stress on gas exchange, water relations, chlorophyll content and leaf structure in the two main Tunisian olive (Olea europaea L.) cultivars

Cited by 283 publications

References 40 publications

Ecophysiology of deciduous plants grown at different densities in the semiarid region of Brazil

Ecophysiology of deciduous plants grown at different densities in the semiarid region of Brazil

Leaf Development Monitoring and Early Detection of Water Deficiency by Low Field Nuclear Magnetic Resonance Relaxation in Nicotiana tabacum Plants

Plant stress activated by chlorine from disinfectants prepared on the base of sodium hypochlorite

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