Temperature-induced changes of photosystem II activity in <i>Quercus ilex</i> and <i>Pinus halepensis</i>

Méthy, M.; Gillon, Dominique; Houssard, Claudié

doi:10.1139/x96-127

Cited by 46 publications

(29 citation statements)

References 18 publications

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“…Knight and Ackerly [21] found significant but rather small differences among individuals from 35 different evergreen trees species originating from desert or sea shores, and grown under common conditions in a greenhouse. Similarly, two Mediterranean tree species, a conifer (Pinus halepensis) and an evergreen angiosperm (Quercus ilex) displayed very close values of therrmostability [28].…”

Section: Introductionmentioning

confidence: 95%

Seasonal variations and acclimation potential of the thermostability of photochemistry in four Mediterranean conifers

et al. 2004

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-Thermostability of photosynthesis was studied in four Mediterranean conifer species growing in southern France, namely Cedrus atlantica and Pinus nigra growing usually on mid elevation areas, and Cupressus sempervirens and Pinus halepensis from coastal areas. Chlorophyll a fluorescence was used and lead to two indices assessing the degree of thermostability of the photosynthetic apparatus: the critical temperature at ground fluorescence breakpoint (T c ) and the temperature threshold inducing a 15% decrease in photochemical efficiency (T 15 ). The two indices were correlated and yielded similar rankings among species, although mean values of T 15 were 6.5°C lower than that of T c . Values of T c were in the range 44 to 52 °C and clear interspecific differences were detected. C. atlantica consistently displayed higher T c than the other species (1-1.5°C difference during a seasonal time course). Among the three other species (C. sempervirens, P. nigra and P. halepensis), the differences were smaller and not always significant. T c also displayed a large intraspecific plasticity, with: (i) a seasonal time-course showing significant increases during summer and lower values during Spring and Autumn; and (ii) large responses to ambient temperatures, with 5-6°C increases in response to a gradual rise of temperature from 10 to 35 °C. The amplitude of the rise was of the same magnitude in all species. Therefore records of thermostability of photosynthesis, whatever the parameter used (T c or T 15 ) need to take into account the large plasticity in this parameter when comparing species or genotypes. The degree of plasticity in response to given changes in micro-environment could be an important functional trait for the tolerance to environmental stresses. high temperature / photosynthesis / Cedrus atlantica / Cupressus sempervirens / Pinus nigra / Pinus halepensis Résumé -Variations saisonnières et potentiel d'acclimatation de la thermostabilité de la photochimie de quatre conifères méditerra-néens. Nous avons analysé la thermostabilité de la photosynthèse de quatre conifères méditerranéens de la forêt française, le cèdre de l'Atlas (Cedrus atlantica ) et le pin noir d'Autriche (Pinus nigra) qui occupent habituellement des zones de montagne, et le cyprès (Cupressus sempervirens) et le Pin d'Alep (Pinus halepensis) qui sont plus spécifiques des zones côtières. La fluorescence de la chlorophylle a a permis d'estimer deux indices de thermostabilité de l'appareil photosynthétique : la température critique à la quelle la fluorescence de base augmente brutalement (T c ), et le seuil de température induisant une baisse de 15 % du rendement quantique de la photochimie (T 15 ). Ces deux indices étaient fortement corrélés et ont conduit au même classement des espèces, bien que les valeurs de T 15 étaient en moyenne plus faibles de 6,5°C que celles de T c . Les valeurs de T c couvraient la gamme de 44 à 52 °C et des différences interspécifiques significatives ont été détectées. C atlantica présentait des valeurs de T c s...

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Section: Introductionmentioning

confidence: 95%

Seasonal variations and acclimation potential of the thermostability of photochemistry in four Mediterranean conifers

et al. 2004

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“…For example, one of the most fundamental processes linking plant nitrogen (N) use and C reserves above and below ground involves the seasonal degradation of chlorophyll (Thomas, 2013;Zhang et al, 2013). It has been shown that elevated autumn temperatures in cold regions can stimulate photosynthetic rates despite the natural shift in photoperiod that marks the beginning of the senescence period (Méthy et al, 1997). This affects the degradation of chlorophyll (Davison, 1991;Fracheboud et al, 2009), and therefore the onset of plant senescence through N and C dynamics (Diaz et al, 2008;Kröger et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Climate warming alters nitrogen dynamics and total non-structural carbohydrate accumulations of perennial herbs of distinctive functional groups during the plant senescence in autumn in an alpine meadow of the Tibetan Plateau, China

Shi

Silva

Zhang

et al. 2015

Agricultural and Forest Meteorology

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“…It has been suggested that this is likely to increase the length of the growing season and thus the productivity of northern hemisphere forests (White et al, 2000;Saxe et al, 2001). Increased temperatures in autumn allow trees to maintain a higher quantum yield (Methy et al, 1997). However, little data are available regarding the metabolic responses of evergreens of the boreal forests to extended growing seasons as a result of warmer air temperatures in late autumn.…”

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Increased Air Temperature during Simulated Autumn Conditions Does Not Increase Photosynthetic Carbon Gain But Affects the Dissipation of Excess Energy in Seedlings of the Evergreen Conifer Jack Pine

2007

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Temperature and daylength act as environmental signals that determine the length of the growing season in boreal evergreen conifers. Climate change might affect the seasonal development of these trees, as they will experience naturally decreasing daylength during autumn, while at the same time warmer air temperature will maintain photosynthesis and respiration. We characterized the down-regulation of photosynthetic gas exchange and the mechanisms involved in the dissipation of energy in Jack pine (Pinus banksiana) in controlled environments during a simulated summer-autumn transition under natural conditions and conditions with altered air temperature and photoperiod. Using a factorial design, we dissected the effects of daylength and temperature. Control plants were grown at either warm summer conditions with 16-h photoperiod and 22°C or conditions representing a cool autumn with 8 h/7°C. To assess the impact of photoperiod and temperature on photosynthesis and energy dissipation, plants were also grown under either cold summer (16-h photoperiod/7°C) or warm autumn conditions (8-h photoperiod/22°C). Photosynthetic gas exchange was affected by both daylength and temperature. Assimilation and respiration rates under warm autumn conditions were only about one-half of the summer values but were similar to values obtained for cold summer and natural autumn treatments. In contrast, photosynthetic efficiency was largely determined by temperature but not by daylength. Plants of different treatments followed different strategies for dissipating excess energy. Whereas in the warm summer treatment safe dissipation of excess energy was facilitated via zeaxanthin, in all other treatments dissipation of excess energy was facilitated predominantly via increased aggregation of the light-harvesting complex of photosystem II. These differences were accompanied by a lower deepoxidation state and larger amounts of b-carotene in the warm autumn treatment as well as by changes in the abundance of thylakoid membrane proteins compared to the summer condition. We conclude that photoperiod control of dormancy in Jack pine appears to negate any potential for an increased carbon gain associated with higher temperatures during the autumn season.

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Temperature-induced changes of photosystem II activity in Quercus ilex and Pinus halepensis

Cited by 46 publications

References 18 publications

Seasonal variations and acclimation potential of the thermostability of photochemistry in four Mediterranean conifers

Seasonal variations and acclimation potential of the thermostability of photochemistry in four Mediterranean conifers

Climate warming alters nitrogen dynamics and total non-structural carbohydrate accumulations of perennial herbs of distinctive functional groups during the plant senescence in autumn in an alpine meadow of the Tibetan Plateau, China

Increased Air Temperature during Simulated Autumn Conditions Does Not Increase Photosynthetic Carbon Gain But Affects the Dissipation of Excess Energy in Seedlings of the Evergreen Conifer Jack Pine

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