Seasonal changes of carbohydrates, lipids and nitrogen content in sun and shade leaves from four mediterranean evergreen sclerophylls

Meletiou-Christou, Maria-Sonia; Rhizopoulou, Sophia; Diamantoglou, S.

doi:10.1016/0098-8472(94)90032-9

Cited by 49 publications

(38 citation statements)

References 36 publications

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“…For both water treatments, seedlings grown at high irradiances showed a higher soluble sugar concentration than seedlings grown under low irradiances. Similar results have been reported by Niinemets [36] in three temperate woody species and by Johnson et al [24] in Fagus sylvatica, but contrast to those presented by Meletiou-Christou et al [30] in four Mediterranean evergreen sclerophylls, which showed no substantial differences on soluble sugars when comparing sun and shade leaves. Changes on water availability through the growing season did not affect either soluble sugar concentration in twoyear-old cork oak seedlings grown outdoors in Portugal, although mean values are higher than ours (between 1.0 and 1.7 mg glucose·cm -2 ), probably related to seedling age [12].…”

Section: (A) (B)contrasting

confidence: 32%

“…In particular, seedlings growing under high irradiances are able to maintain the turgor when water is limitant by decreasing the osmotic potential, through the accumulation of osmotically active solutes or by changing the bulk leaf modulus of elasticity [1,5,9]. However, Meletiou-Christou et al [30] comparing sun and shade leaves of four evergreen sclerophylls, did not find any significant differences in the soluble sugar concentration.…”

Section: Introductionmentioning

confidence: 87%

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Water relations of cork oak (Quercus suber L.) seedlings in response to shading and moderate drought

Pardos¹,

Clavijo²,

Aranda³

et al. 2005

Ann. For. Sci.

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-The interactive effects of light and drought on water relations and soluble sugars were addressed on Quercus suber L. seedlings grown under the combination of four irradiances and two soil water contents. Leaf water potentials at predawn and midday were lower for water stressed seedlings, independently of light environment. Osmotic potentials at full (Ψπ 100 ) and zero turgor (Ψπ 0 ) decreased with drought, under the four light treatments. However, the decline was greater with the development of water stress under the two treatments of higher light availability. The higher soluble sugar concentrations in seedlings grown under higher irradiances provoked a decrease of Ψπ 0. The decrease in Ψπ 100 and Ψπ 0 in moderate stressed seedlings was accompanied by an increase in ε max . The lower ability for osmotic adjustment in seedlings grown under moderate water stress and low light environment suggested a lower efficiency in developing physiological mechanisms for drought tolerance in shade-grown seedlings.cork oak / drought / light / osmotic adjustment / soluble sugars Résumé -Relations hydriques des semis de chêne-liège (Quercus suber L.) en réponse à l'ombre et à une sécheresse modérée. Les effets interactifs de la lumière et de la sécheresse sur les relations hydriques et les sucres solubles ont été étudiés sur des plantules de Quercus suber L. qui ont poussé sous la combinaison de quatre éclairements différents et de deux contenus en eau du sol. Les potentiels hydriques foliaires mesurés l'un avant l'aube et l'autre à midi étaient plus bas pour les plantules subissant un stress hydrique indépendamment du niveau d'éclairement. La pression osmotique à pleine turgescence (Ψπ 100 ) et la pression osmotique à turgescence nulle (Ψπ 0 ) ont diminué avec la sécheresse sous les quatre éclairements. Cependant, les diminutions étaient plus grandes pour les plantules soumises à un stress hydrique et à un éclairement élevé. La plus grande concentration de sucres solubles des plantules ayant poussé sous un plus grand éclairement a provoqué la diminution de Ψπ 0 . La diminution de Ψπ 100 et de Ψπ 0 pour les plantules ayant poussé sous une sécheresse modérée a été accompagnée d'une augmentation de ε max . La moindre capacité pour l'ajustement osmotique des plantules ayant poussé sous un stress hydrique modéré et une faible intensité lumineuse a montré une plus faible efficacité pour le développement des mécanismes physiologiques de tolérance à la sécheresse de ces plantules ayant poussé à l'ombre.chêne-liège / sécheresse / lumière / ajustement osmotique / sucres solubles

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Section: (A) (B)contrasting

confidence: 32%

Section: Introductionmentioning

confidence: 87%

Water relations of cork oak (Quercus suber L.) seedlings in response to shading and moderate drought

Pardos¹,

Clavijo²,

Aranda³

et al. 2005

Ann. For. Sci.

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“…Water deficits reduced tree growth and affected carbon metabolism, increasing the concentration of soluble sugars in the bark tissues. Similar results were found for other eucalyptus trees [24] and in several Mediterranean species [9,22,29].…”

Section: Discussionsupporting

confidence: 74%

Positive effect of drought on longicorn borer larval survivl and growth on eucalyptus trunks

Caldeira¹,

Fernandéz²,

Tomé³

et al. 2002

Ann. For. Sci.

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-Phoracantha semipunctata (F.) larvae attack and kill trees in Eucalyptus globulus (Labill.) plantations in Mediterranean countries. To test the hypothesis that these attacks are more likely in arid environments, we examined the effects of water deficits in the host trees of E. globulus on the mortality and growth of P. semipunctata larvae. Trees subjected to water stress during two subsequent years were compared with rainfed and irrigated trees. Larvae of P. semipunctata were artificially introduced in the bark of trees of either treatment. Larvae mortality was lower and weight gain was higher in water stressed trees than on rainfed trees. There was no larvae survival in irrigated trees. These results were related to changes in moisture content and concentration of soluble sugars in the bark of the trees. The results of this study suggest that water stress had a major role on the survival and growth of the larvae.Cerambycidae / Phoracantha semipunctata / plant-insect interaction / water-deficit / bark borer Résumé -Effets positifs de la sécheresse du sol sur la survie et la croissance des larves de Phoracantha semipunctata sur l'eucalyptus. Le Phoracantha semipunctata (F.) (Coleoptera : Cerambycidae) est un ravageur commun des plantations d'Eucalyptus globulus (Labill.) des milieux méditerranéens, particulièrement dans les régions les plus arides. La mortalité et la croissance des larves de P. semipunctata ont été comparées in vivo sur des arbres d'E. globulus soumis à trois traitements : stress hydrique durant deux années consécutives, irrigation et témoins. Des larves de P. semipunctata ont été artificiellement introduites dans l'écorce des arbres soumis aux trois traitements. Une plus faible mortalité et une augmentation de la biomasse des larves ont été obtenues chez les arbres stressés, comparativement aux arbres témoins. Chez les arbres irrigués la mortalité de larves était totale. Les effets de la teneur en eau et de la concentration en sucres solubles de l'écorce sur la mortalité larvaire ont aussi été testés. Nos résultats permettent de conclure que le stress hydrique est un facteur déterminant dans la réussite de la colonisation de l'arbre par les larves de P. semipunctata. Cerambycidae / Eucalyptus globulus / Phoracantha semipunctata / interaction plante-insecte / contrainte hydrique Ann. For. Sci. 59 (2002) [99][100][101][102][103][104][105][106] 99

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“…The reason for this, however, is unclear. It might be due to seasonal changes in non structural carbohydrates (Larcher and Thomaser-Thin 1988;Meleitou-Christou et al 1992;Cruz and Moreno 2001;Palacio et al 2007) as there is evidence that in stems of Mediterranean-type woody plant species an increase in the concentration of soluble sugars during stressful conditions such as summer drought is accompanied by a decline in starch concentration (Cruz and Moreno 2001), which is a common feature in response to stressful conditions. However, this was not investigated.…”

Section: Discussionmentioning

confidence: 97%

Spatial and seasonal variations in stem CO2 efflux of Pinus canariensis at their upper distribution limit

Brito

Morales

Wieser

et al. 2010

Trees

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We calculated stem CO 2 efflux (E S ) of Pinus canariensis at a timberline site in Tenerife, Canary Islands, from March 7, 2008 and February 9, 2009. E S varied markedly throughout the year. Although E S generally followed the seasonal trends in temperature, we observed seasonal adjustment of E S in both E S normalized to temperature (E S10 ) and the temperature sensitivity (Q 10 ) resulting in lower E S10 values during the warm and dry season as compared during the cold and wet season; the latter corresponding with the period of stem growth. The Q 10 by contrast, was higher during the warm and dry summer than during the cold and wet season, an observation suggesting that climate extremes such as summer drought in the Mediterranean may override the observation that Q 10 declines with increasing temperature. As concurrent measurements estimating the potential impact of sap flow on E S revealed no interaction in P. canariensis, the Q 10 values were used along with E S10 and stem temperature records to predict annual total E S and for partitioning total E S into its maintenance (E m ) and a growth (E g ) component.

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Seasonal changes of carbohydrates, lipids and nitrogen content in sun and shade leaves from four mediterranean evergreen sclerophylls

Cited by 49 publications

References 36 publications

Water relations of cork oak (Quercus suber L.) seedlings in response to shading and moderate drought

Water relations of cork oak (Quercus suber L.) seedlings in response to shading and moderate drought

Positive effect of drought on longicorn borer larval survivl and growth on eucalyptus trunks

Spatial and seasonal variations in stem CO2 efflux of Pinus canariensis at their upper distribution limit

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