Effects of partial defoliation on carbon and nitrogen partitioning and photosynthetic carbon uptake by two-year-old cork oak (Quercus suber) saplings

Cerasoli, Sofia; Scartazza, Andrea; Brugnoli, Enrico; Chaves, M. M.; Pereira, J. S.

doi:10.1093/treephys/24.1.83

Cited by 28 publications

(21 citation statements)

References 24 publications

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“…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]. The higher soluble sugar concentrations in seedlings grown under higher irradiances provoked a decrease of the osmotic potential at full turgor (Ψπ 100 ) and are at least partly responsible for osmotic adjustment [31].…”

Section: (A) (B)contrasting

confidence: 86%

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: 86%

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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“…Seedlings have a smaller capacity for storage of assimilates than larger plants. Thus, following loss of photosynthetic area, the demand on stored carbon reserves is likely to be intense (Cesaroli et al, 2004) and result in relatively high consumption or export of assimilates. The present study suggests that insect defoliation increased export of sugars from the leaf (Tab.…”

Section: Discussionmentioning

confidence: 99%

Do artificial and natural defoliation have similar effects on physiology of Eucalyptus globulus Labill. seedlings?

et al. 2010

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Abstract• Artificial defoliation is often used to simulate defoliation by herbivory and is usually considered a good indication of a plant's response to a given type of damage. However, the findings of studies directly comparing the two defoliation types are inconsistent.• Here, the short term effects of artificial and insect defoliation by larvae of Paropsisterna agricola on growth, biomass allocation and photosynthetic capacity of Eucalyptus globulus seedlings were compared in a glasshouse experiment. The artificial defoliation was carried out to closely resemble the spatial patterns observed for insect defoliation.• Height and diameter increments were reduced as a result of insect defoliation, whereas artificial defoliation had no significant effect on height. Increased photosynthetic capacity was observed in response to both treatments, but the magnitude of this increase was larger in insect-than in artificially-defoliated seedlings. Significant reductions in foliar carbohydrate content and total biomass were noticeable in artificially-defoliated seedlings. Although the foliar carbohydrate levels also decreased across the crown zones following insect defoliation treatment, seedlings allocated a large amount of their biomass in the branches of the damaged zone.• Despite our best endeavours to simulate insect defoliation in the artificial treatment, the latter may not reflect accurately the full strength of the effects. However, artificial and insect defoliation were similar in their direction of the responses they caused in E. globulus seedlings. Mots-clés :Paropsisterna agricola / croissance / allocation de la biomasse / capacité de la photosynthèse / glucides Résumé -Les défoliations artificielle et naturelle ont-elles des effets similaires sur la physiologie de jeune plants d'Eucalyptus globulus Labill. ?• La défoliation artificielle est couramment employée pour simuler la défoliation par les insectes herbivores et elle est généralement considérée comme un bon indicateur de la réponse des plantes pour un type de dommage donné. Cependant, les résultats d'études comparant directement les deux types de défoliation sont inconsistants.• Ici, les effets court terme des défoliations artificielles et naturelles par la larve de Paropsisterna agricola ont été comparés au plan de la croissance, de l'allocation de la biomasse et de la capacité de photosynthèse dans une expérimentation conduite en serre. La défoliation artificielle a été menée pour ressembler étroitement aux modèles spatiaux observés avec la défoliation par les insectes.• À la suite de la défoliation par les insectes, les accroissements en hauteur et en diamètre ont été ré-duits, alors que la défoliation artificielle n'a eu aucun effet significatif sur la hauteur. L'augmentation de la capacité de photosynthèse a été observée en réponses aux deux traitements, mais l'ampleur de cette augmentation a été plus forte pour les plants défoliés par les insectes que pour les plants artificiellement défoliés. Des réductions significatives de la teneur foliaire en...

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“…The effects of N limitation on eucalypt production are well documented (Nambiar, 1984;Sheriff and Nambiar, 1991;Pereira et al, 1992;Smethurst et al, 2003) and include reduced leaf area and stem growth (Sheriff and Nambiar, 1991;Barry et al, 2012). In defoliation studies, nitrogen remobilisation has been shown to be important in recovery in many tree species (Millard et al, 2001;Cerasoli et al, 2004) although in general, the effects of defoliation on N remobilisation in eucalypts species are poorly understood. Foliar N concentrations in E. globulus remain at similar levels to those of non-limited plants (Pereira et al, 1992;Pinkard et al, 2011b), meaning that photosynthetic capacity per unit leaf area is similar under limited and non-limited conditions.…”

Section: Water and Nutrient Effectsmentioning

confidence: 99%

Impact of defoliation in temperate eucalypt plantations: Physiological perspectives and management implications

Eyles¹,

Barry²,

Quentin³

et al. 2013

Forest Ecology and Management

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Effects of partial defoliation on carbon and nitrogen partitioning and photosynthetic carbon uptake by two-year-old cork oak (Quercus suber) saplings

Cited by 28 publications

References 24 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

Do artificial and natural defoliation have similar effects on physiology of Eucalyptus globulus Labill. seedlings?

Impact of defoliation in temperate eucalypt plantations: Physiological perspectives and management implications

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