Chlorophyll fluorescence as a tool in photosynthesis research

Bolhàr‐Nordenkampf, H. R.; Öquist, Gunnar

doi:10.1007/978-94-010-9626-3_12

Cited by 62 publications

(56 citation statements)

References 21 publications

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“…Although F v /F m values at midday were slightly lower than those obtained early in the morning and late afternoon, they were always in the range considered normal for a healthy non-stressed plant (Bolhár-Nordenkampf and Öquist, 1993). The maintenance of constant F v /F m values at midday throughout the study demonstrates the lack of drought induced damage to PSII photochemistry, as has been reported also for many other species (Genty et al, 1987;Jiménez et al, 1999).…”

Section: Chlorophyll Fluorescencesupporting

confidence: 67%

Physiological responses of tagasaste to a progressive drought in its native environment on the Canary Islands

González‐Rodríguez

Martín-Olivera

Morales

et al. 2005

Environmental and Experimental Botany

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Diurnal courses of gas exchange, chlorophyll fluorescence, shoot water potential (Ψ ) and leaf relative water content (RWC leaf ) were recorded in Chamaecytisus proliferus (L. fil.) Link ssp. proliferus var. palmensis (Christ) (tagasaste) growing in natural conditions in the North-West slope of Tenerife, Canary Islands. During the studied period (April-July 2000), the soil relative water content (RWC soil ) progressively decreased, while the air vapour pressure deficit increased. As a consequence a decrease in Ψ and RWC leaf took place as well as a decrease in stomatal conductance (g s ) and CO 2 assimilation rate (A). These characteristics, typical of an anisohydric plant, allowed this species to endure a mild drought.Photochemical efficiency of PSII (φ PSII ) followed the inverse pattern to that observed for the photosynthetic photon flux density (PPFD), decreasing at midday and recovering during the late afternoon. This recovering at the end of each day, and the constant values of the maximum quantum yield of PSII photochemistry (F v /F m ) during the studied period, indicate that there was no permanent damage to the photosynthetic apparatus due to mild water stress.

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Section: Chlorophyll Fluorescencesupporting

confidence: 67%

Physiological responses of tagasaste to a progressive drought in its native environment on the Canary Islands

González‐Rodríguez

Martín-Olivera

Morales

et al. 2005

Environmental and Experimental Botany

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“…The optimum range is 0.79-0.84, but this varies [84]; a lower value is seen when the plant has been exposed to stress, indicating photoinhibition [85]. The Fv/Fm parameter appears to be relatively insensitive to severe water limitation but could be used to differentiate between responses at cold temperatures.…”

Section: Discussionmentioning

confidence: 99%

The Impact of Tourist Traffic on the Condition and Cell Structures of Alpine Swards

Kycko

Zagajewski

Lavender³

et al. 2018

Remote Sensing

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This research focuses on the effect of trampling on vegetation in high-mountain ecosystems through the electromagnetic spectrum's interaction with plant pigments, cell structure, water content and other substances that have a direct impact on leaf properties. The aim of the study was to confirm with the use of fluorescence methods of variability in the state of high-mountain vegetation previously measured spectrometrically. The most heavily visited part of the High Tatras in Poland was divided into polygons and, after selecting the dominant species within alpine swards, a detailed analysis of trampled and reference patterns was performed. The Analytical Spectral Devices (ASD) FieldSpec 3/4 were used to acquire high-resolution spectral properties of plants, their fluorescence and the leaf chlorophyll content with the difference between the plant surface temperature (ts), and the air temperature (ta) as well as fraction of Absorbed Photosynthetically Active Radiation (fAPAR) used as reference data. The results show that, along tourist trails, vegetation adapts to trampling with the impact depending on the species. A lower chlorophyll value was confirmed by a decrease in fluorescence, and the cellular structures were degraded in trampled compared to reference species, with a lower leaf reflectance. In addition, at the extreme, trampling can eliminate certain species such as Luzula alpino-pilosa, for which significant changes were noted due to trampling.

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“…Chlorophyll fluorescence, expressed as the Fv/Fm ratio, is a good indicator of photosystem II efficiency and it has been used to estimate long term responses to cold and water stress assays [6]. Although chlorophyll fluorescence has been used as an indicator of hardening process and the development of dormancy [2,4,23], sometimes dormancy and stress hardiness are acquired and lost differently, suggesting that they are independent physiological processes [27].…”

Section: Discussionmentioning

confidence: 99%

Effects of temperature on growth and stress hardening development of phytotron-grown seedlings of Aleppo pine (Pinus halepensis Mill.)

Fernández

Royo²,

Gil³

et al. 2003

Ann. For. Sci.

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-One year-old Pinus halepensis seedlings, grown in peat-vermiculite-pine bark mix in 200 cm 3 containers, were moved to a growth chamber and submitted to a progressive decrease of temperature and photoperiod for three months. Morphological parameters and nutrient and non-structural carbohydrate content were measured. Root growth potential, freezing and drought resistance tests were assessed. Although height growth stopped when the minimum temperature fell below 9 ºC, shoot dry weight increased further. Needle potassium concentration and K/N ratio increased progressively and significantly throughout the trial. This may be attributed to potassium accumulation. As height growth stopped, physiological changes were detected in shoot nitrogen and soluble sugar concentrations, root activity and hydraulic conductance maintenance. Nevertheless, cold and drought resistance tests, as well as root regeneration potential, did not reveal any sign of plant stress tolerance until the minimum temperature decreased to 8 ºC and photoperiod to 9 h. This latter temperature may be considered to be the threshold for Pinus halepensis to accumulate the required chilling hours that make seedlings suitable for afforestation purposes. At least, more than 330 chilling hours (£ 8 ºC) are required to reach a minimum level of stress hardiness. The Fv/Fm chlorophyll fluorescence ratio, measured just one day after the freezing test, provides a good estimate of plant frost tolerance.Pinus halepensis / plant quality / stress tolerance / chilling hours / chlorophyll fluorescence / plant nutrition Résumé -Effets de la température sur la croissance et le développement de la résistance au stress de semis de Pin d'Alep (Pinus halepensis Mill.). Des semis de Pin d'Alep (Pinus halepensis), âgés d'un an, croissant sur un mélange de tourbe-vermiculite-écorce de pin dans des containers de 200 cm 3 , ont été mis en place dans une chambre de croissance et soumis, pour une période de 3 mois, à une température et photopériode décroissant progressivement. Des paramètres morphologiques, de nutrition et de teneur carbonée non structurale ont été mesurés. Des tests de potentiel de croissance racinaire, de résistance au froid et à la sécheresse ont été réalisés. Bien que la croissance en hauteur se soit arrêtée lorsque la température minimum eu atteint 9°C, la masse sèche des pousses continue d'augmenter. La concentration en potassium des aiguilles, le rapport K/N augmente progressivement et significativement au cours de l'essai. Ceci peut être attribué à une accumulation de potassium. Lorsque la croissance en hauteur s'est arrêtée, des changements physiologiques ont été constatés pour la concentration en azote et en sucre soluble des pousses, dans l'activité des racines et dans le maintien de la conductance hydraulique. Cependant, les tests de résistance au froid et à la sécheresse, de même que le potentiel de régénération racinaire, ne révélèrent aucun signe de tolérance de la plante au stress jusqu'à ce que la température minimum décroisse à 8°C et la ph...

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Chlorophyll fluorescence as a tool in photosynthesis research

Cited by 62 publications

References 21 publications

Physiological responses of tagasaste to a progressive drought in its native environment on the Canary Islands

Physiological responses of tagasaste to a progressive drought in its native environment on the Canary Islands

The Impact of Tourist Traffic on the Condition and Cell Structures of Alpine Swards

Effects of temperature on growth and stress hardening development of phytotron-grown seedlings of Aleppo pine (Pinus halepensis Mill.)

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