Differences in the response of carbon assimilation to summer stress (water deficits, high light and temperature) in four Mediterranean tree species

Faria, Teresa; Silvério, Divino Vicente; Breia, E.; Cabral, Raquel; Abadı́a, Anunciación; Abadı́a, Javier; Pereira, J. S.; Chaves, M. M.

doi:10.1034/j.1399-3054.1998.1020310.x

Cited by 160 publications

(102 citation statements)

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“…This result is consistent with the notion that long-term drought can lead to a detrimental effect and damage in the PSII function (Faria et al 1998). It can be inferred that the PSII function of the Ledu population was less damaged by drought than that of the Hanyuan population because of the no pronounced decrease in F v / F m in the Ledu population.…”

Section: Discussionsupporting

confidence: 80%

Interactions between drought and shade on growth and physiological traits in two Populus cathayana populations

et al. 2008

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Abstract:The morphological and physiological responses of two contrasting Populus cathayana Rehd. populations to three light regimes, full sunlight (control), 33% full sunlight (moderate shade), and 12% full sunlight (severe shade), were investigated under well-watered and drought conditions. The populations were from Hanyuan (relatively more annual rainfall and less annual solar radiation) and Ledu (less annual rainfall and more annual solar radiation) in western China. In both populations, drought-treated plants exhibited reduced growth, leaf relative water content, net photosynthesis, and maximal efficiency of photosystem II (PSII); increased levels of chlorophyll, carotenoid, abscisic acid, and carbon isotope composition; and a greater accumulation of malondialdehyde (MDA) than did well-watered plants. There was an apparent alleviation of drought effects by moderate shade, especially in the Hanyuan population, as indicated by the higher leaf relative water content, net photosynthesis, stomatal conductance, and maximal efficiency of PSII and the lower MDA content. On the other hand, an apparent aggravation of drought effects by severe shade was also observed, especially in the Ledu population, as indicated by the lower total biomass and net photosynthesis and the higher MDA content. Moreover, the Hanyuan population was more shade tolerant and drought sensitive than the Ledu population. dans l'ouest de la Chine. Dans les deux populations, la croissance, la teneur relative en eau dans les feuilles, la photosynthèse nette et l'efficacité maximale de PSII étaient plus faibles et les quantités de chlorophylle, de carotène, d'acide abscissique, la composition isotopique du carbone ainsi que l'accumulation de propanedial étaient plus élevées chez les plants exposés à la sécheresse que chez les plants bien arrosés. Les effets de la sécheresse ont apparemment été atténués par un ombrage modéré, spécialement dans la population de Hanyuan, tel que l'indiquaient une teneur relative en eau dans les feuilles, une photosynthèse nette, une conductance stomatale et une efficacité maximale de photosystème II (PSII) plus élevées ainsi qu'un contenu en propanedial plus faible. D'un autre côté, les effets de la sécheresse ont apparemment été aggravés par des conditions très ombragées, spécialement dans la population de Ledu, tel que l'indiquaient la biomasse totale et la photosynthèse nette plus faibles ainsi que le contenu en propanedial plus élevé. De plus, la population de Hanyuan était plus tolérante à l'ombre et plus sensible à la sécheresse que la population de Ledu.[Traduit par la Rédaction]

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Section: Discussionsupporting

confidence: 80%

Interactions between drought and shade on growth and physiological traits in two Populus cathayana populations

et al. 2008

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“…Whereas these ecophysiological parameters are relatively broadly studied under eu-Mediterranean conditions (e.g. Tenhunen et al, 1987;Faria et al, 1998;Gratani and Ghia, 2002), information on plant per-formance under humid Mediterranean conditions are scarce.…”

Section: Introductionmentioning

confidence: 99%

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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“…At a maximum air temperature of 45-47 °C, it is unlikely that species within the mallee-heathland had open stomata, especially during the hottest part of the two days. In other studies, diurnal stomatal conductance often has remained < 0.03 mol·m -2 ·s -1 in response to the temperature and water-stress conditions of a Mediterranean-type summer (Lange, Tenhunen & Braun, 1982;Valladares & Pearcy, 1997;Faria et al, 1998), resulting in up to a 10 °C increase in leaf temperature. In our study, similar increases would have resulted in leaves heating beyond lethal levels, assuming they are similar to those of other Mediterranean environs (i.e., 47-50 °C; Larcher, 2000).…”

Section: Discussionmentioning

confidence: 99%

Heat damage in sclerophylls is influenced by their leaf properties and plant environment

Groom¹,

Lamont

Leighton

et al. 2004

Écoscience

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Mediterranean southwestern Australia experienced two successive days of extreme (> 45 °C) maximum temperatures and hot winds during the summer of 1991, resulting in adult mortality and extensive crown damage in a sclerophyllous mallee-heathland. To investigate the relationship between leaf attributes, plant environment, and heat tolerance in sclerophylls, measurements of plant height, leaf clustering, leaf morphology (thickness, dry density, area, perimeter/area ratio), percentage crown damage, and percentage mortality, and categories of exposure to wind, shade, and bare soils were recorded for 40 heat-damaged and 14 undamaged co-occurring species. Analyzing the entire dataset by principal components analysis showed that undamaged species had thicker leaves (on average 61% thicker) than species with damaged leaves and were more exposed to wind, sun, and bare soil. Thicker leaves are a common response to hot, dry, and more exposed environments and are more heat tolerant than thinner leaves. A separate analysis of the Proteaceae (25 damaged and six undamaged species) showed a similar trend to the overall dataset. An analysis of the Myrtaceae (10 damaged and three undamaged species) showed that wind exposure and level of shading were the most important variables influencing the degree of leaf damage. Percentage leaf damage was significantly correlated with percentage adult mortality, but not with the ability of a species to regrow (percentage of plants producing new shoots). Differences between undamaged and damaged species may be a result of preconditioning, whereby species growing in more exposed habitats were pre-adapted to tolerate periods of heat stress. It is unlikely that the study species were able to reduce leaf temperatures via transpirational cooling during the hottest part of the 2-d heatwave. The ability of a species to tolerate extreme temperature events will be determined by the interaction between leaf heat loads, leaf heat-storing capacity, and the degree of exposure to environmental elements. Keywords: heat tolerance, leaf clustering, leaf damage, leaf thickness, Mediterranean-type summer.Résumé : Le sud-ouest de l'Australie, une région au climat méditerranéen, a connu deux journées successives de températures maximales extrêmes (> 45 °C) et de vents chauds pendant l'été 1991, ce qui a eu pour effet d'engendrer une mortalité chez les arbres adultes ou de causer des dommages considérables à la couronne de ces derniers dans les landes à plantes sclérophylles. Afin de connaître les relations existant entre les caractéristiques des feuilles, l'environnement des plantes et la tolérance à la chaleur des plantes sclérophylles, nous avons mesuré différents paramètres chez 40 espèces ayant subi des dommages causés par la chaleur et chez 14 autres espèces voisines n'ayant pas été affectées. Les paramètres retenus ont été la hauteur des plantes, le regroupement des feuilles, la morphologie des feuilles (épaisseur, densité à l'état sec, surface, rapport du périmètre sur la surface), le pourcentage d...

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Differences in the response of carbon assimilation to summer stress (water deficits, high light and temperature) in four Mediterranean tree species

Cited by 160 publications

References 0 publications

Interactions between drought and shade on growth and physiological traits in two Populus cathayana populations

Interactions between drought and shade on growth and physiological traits in two Populus cathayana populations

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

Heat damage in sclerophylls is influenced by their leaf properties and plant environment

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