Starch and soluble carbohydrates in leaves of water-stressed oak saplings

Epron, Daniel; Dreyer, Erwin

doi:10.1051/forest:19960209

Cited by 52 publications

(35 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This can be explained by the demand of carbon for performing the acclimation to the stress. In oaks, the increase in the concentration of solutes needed for osmotic adjustment obviously is achieved by a shift in carbohydrate formation from starch and sucrose to soluble glucose and fructose [9]. With increasing drought stress, the carbon gain is lowered by the reduction in g. Carbon is then preferentially channelled into the formation of roots.…”

Section: Discussionmentioning

confidence: 99%

“…Seedlings of the pedunculate oak were shown to osmotically adjust their leaf water potential when subjected to consecutive drying cycles [19]. However, these plants were grown under greenhouse conditions, and in containers with restricted rooting volume as was also the case in other studies [9,28]. Therefore, we conducted a study on pedunculate and sessile oak seedlings whose roots were allowed to grow without restriction outside the greenhouse under controlled conditions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Morphological and physiological responses of oak seedlings (Quercus petraea and Q. robur) to moderate drought

Thomas

Gausling

2000

Ann. For. Sci.

View full text Add to dashboard Cite

To cite this version:Frank Thomas, Thomas Gausling. Morphological and physiological responses of oak seedlings (Quercus petraea and Q. robur) to moderate drought. Annals of Forest Science, Springer Verlag/EDP Sciences, 2000, 57 (4) Abstract -To study their responses to a moderate drought, seedlings of sessile (Quercus petraea [Matt.] Liebl.) and pedunculate oak (Q. robur L.) were grown in outdoor lysimeters that allowed unrestricted root growth. They were subjected to a moderate drought from mid-June to the end of August. The stomatal conductance remained almost unaffected by drought. In the drought-stressed seedlings, the relative foliar water deficits were significantly higher, and the predawn leaf water potentials were significantly lower than in the control plants. The decrease in osmotic pressures at maximum turgor and at the point of turgor loss in the drought-stressed plants indicated osmotic adjustment. The ratio of leaf to fine-root biomass was significantly diminished in the drought-stressed seedlings. In combination with previous observations, the results indicate that, in the Central-European oak species, a shift in biomass compartmentation is the predominant process in acclimation to drought since it also occurs under severe drought stress in contrast to osmotic adjustment, which was only found under conditions of a moderate drought. Quercus / drought / leaf-root biomass ratio / osmotic adjustment / pressure-volume analysisRésumé -Réponses morphologiques et physiologiques de semis de chêne (Quercus petraea et Q. robur) face à une sécheresse modérée. Afin d'étudier leur réaction face à une sécheresse modérée, des plantules de chêne sessile (Quercus petraea [Matt.] Liebl.) et de chêne pédonculé (Q. robur L.) ont été cultivées à l'extérieur, dans une cuve lysimétrique permettant un développement illimité des racines. Le régime de sécheresse modérée leur a été appliqué de mi-juin jusqu'à fin août. La conductance foliaire stomatique n'a guère été affectée par la sécheresse. Le degré du déficit hydrique foliaire relatif des plantules stressées par la sécheresse avait augmenté de façon significative alors que le potentiel hydrique foliaire mesuré avant l'aube fut plus bas que celui des plantules témoins. La diminution des pressions osmotiques en pleine turgescence et au point zéro turgor des plantules stressées indiquerait un ajustement osmotique. Les plantules stressées ont montré un ratio de la biomasse foliaire par rapport à la biomasse des racines fines qui avait baissé de manière significative. Les résultats complètent ainsi des études antérieures indiquant que pour les chênes européens le changement de la compartimentation de la biomasse serait le processus prédominant dans l'acclimatation à la sécheresse. En effet, ce phénomène surgit également lors d'une sécheresse excessive tandis que l'ajustement osmotique n'a été constaté que lors d'une séche-resse modérée.Quercus / ajustement osmotique / analyse pression-volume / rapport des biomasses feuilles-racines / sécheresse Ann. For. Sci. 57 (2000) 325-3...

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphological and physiological responses of oak seedlings (Quercus petraea and Q. robur) to moderate drought

Thomas

Gausling

2000

Ann. For. Sci.

View full text Add to dashboard Cite

show abstract

“…Sink activation of A has been hypothesized to be related to removal of end-product inhibition as a result of leaf starch-pool depletion (Sasek, DeLucia & Strain, 1985). Net assimilation rate and leaf starch and sucrose contents decreased in Q. petraea with the imposition of water deficits, whereas glucose and fructose contents increased (Epron & Dreyer, 1996). In the absence of drought, increased assimilation by first-flush Q. robur leaves drove second-flush development by means of increased partitioning of photosynthate to exportable sucrose at no expense to the content of starch (Alaoui-Sosse!…”

Section: P D Anderson and P T Tomlinsonmentioning

confidence: 99%

Ontogeny affects response of northern red oak seedlings to elevated CO₂ and water stress: I. Carbon assimilation and biomass production

Anderson

Tomlinson

1998

New Phytologist

View full text Add to dashboard Cite

The interactive influences of elevated carbon dioxide, water stress, and ontogeny on carbon assimilation and biomass production were investigated in northern red oak, a species having episodic shoot growth characteristics. Seedlings were grown from acorns through three shoot-growth flushes (8-11 wk) in controlled-environment chambers at 400, 530 or 700 µmol mol −" CO # and under well watered or water-stressed soil-moisture regimes. Increasing CO # growth concentration from 400 to 700 µmol mol −" resulted in a 34 % increase in net assimilation rate (A), a 31 % decrease in stomatal conductance to water vapour (g s ) and a 141 % increase in water use efficiency (WUE) in well watered seedlings. In contrast, water-stressed seedlings grown at 700 µmol mol −" CO # demonstrated a 69 % increase in A, a 23 % decrease in g s , and a 104 % increase in WUE. However, physiological responses to increased CO # and water stress were strongly modified by ontogeny. During active third-flush shoot growth, A in first-flush and second-flush foliage of water-stressed seedlings increased relative to the quiescent phase following cessation of second-flush growth by an average of 115 % ; g s increased by an average of 74 %. In contrast, neither A nor g s in comparable foliage of well watered seedlings changed in response to active third-flush growth. Whereas seedling growth was continuous through three flushes in well watered seedlings, growth of water-stressed seedlings was minimal following the leaf-expansion stage of the third flush. Through three growth flushes total seedling biomass and biomass allocation to root, shoot and foliage components were very similar in water-stressed seedlings grown at 700 µmol mol −" CO # and well watered seedlings grown at 400 µmol mol −" CO # . Enhancement effects of elevated CO # on seedling carbon (C) assimilation and biomass production may offset the negative impact of moderate water stress and are likely to be determined by ontogeny and stress impacts on carbon sink demand.

show abstract

“…3). Generally, European oak can sustain periods of prolonged drought due to a complex system of stomatal (Dickson and Tomlinson, 1996) and non-stomatal controls of carbon fixation (Epron and Dreyer, 1996). The clear negative association between growth and water deficit, however, points to reduced hydraulic conductance of shoots, and, as a result, limits stomatal conductance and carbon assimilation during drought periods (Rust and Roloff, 2002).…”

Section: Growth and Monthly Weather Conditionsmentioning

confidence: 99%

Influence of annual weather on growth of pedunculate oak in southern Sweden

et al. 2008

View full text Add to dashboard Cite

-• A network of oak (Quercus robur L.) chronologies containing 49 sites and 635 single trees was analysed to identify weather variables affecting annual tree-ring increment dynamics in southern Sweden during 1860-2000.• We analysed (1) the growth response of oak to non-extreme weather, and (2) the temporal and spatial patterns of regional growth anomalies (pointer years) and associated climatic extremes resolved on a monthly scale.• Growth was controlled by precipitation in the current (June-July) and the previous growing season (August) in 48% and 22% of all sites, respectively. Temperature during July of the current year and August of the previous year was negatively correlated with growth in 29% and 43% of the sites, respectively. Growth was positively correlated with temperature in October of the previous season in 72% of the sites. The most extensive growth anomaly occurred in 1965 and was probably caused by intrusion of cold Arctic air masses into the region at the end of March that year.• During climatically non-extreme years, oak growth is driven mostly by the dynamics of summer precipitation. Many of the negative growth anomalies, however, were associated with temperature extremes. Southern Swedish oak pointer years tend not to coincide with the pan-European oak pointer years.climatic variability / dendroecology / extreme events / hardwood / Scandinavia Résumé -Influence de la variabilité interannuelle de climat sur la croissance du chêne pédonculé dans le Sud de la Suède.• Une série de chronologies de chênes (Quercus robur L.) comprenant 49 stations et 635 arbres individuels a été analysée pour identifier les variables climatiques affectant la dynamique de croissance annuelle des cernes dans le Sud de la Suède, pendant la période 1860-2000.• Nous avons analysé (1) la réponse de croissance des chênes aux évènements météorologiques non extrêmes et (2) les patrons temporels et spatiaux des anomalies régionales de croissance (années indices) et les extrêmes climatiques associés au pas de temps mensuel.• La croissance était contrôlée par les précipitations de la saison de végétation (juin-juillet) et les précipitations de la saison de végétation précédente (août), respectivement dans 48 % et 22 % de toutes les stations. Les températures du mois de juillet de la saison de végétation et du mois d'août de l'année précédente étaient corrélées négativement avec la croissance, respectivement dans 29 % et 43 % des stations. La croissance était corrélée positivement avec la température du mois d'octobre de l'année précédente dans 72 % des stations. L'anomalie de croissance la plus considérable est arrivée en 1965 et a été causée probablement par l'intrusion de masses d'air froid arctique dans la région, à la fin du mois de mars.• Pendant les années climatiquement non-extrêmes, la croissance du chêne est principalement commandée par la dynamique des précipitations estivales. Cependant, beaucoup d'anomalies négatives de croissance ont été associées avec des extrêmes de température. Les années indices du Sud ...

show abstract

Starch and soluble carbohydrates in leaves of water-stressed oak saplings

Abstract: Summary — Four-year-old potted saplings of Quercus petraea (Matt) Liebl were exposed to water shortage by withholding irrigation. After

Cited by 52 publications

References 24 publications

Morphological and physiological responses of oak seedlings (Quercus petraea and Q. robur) to moderate drought

Morphological and physiological responses of oak seedlings (Quercus petraea and Q. robur) to moderate drought

Ontogeny affects response of northern red oak seedlings to elevated CO₂ and water stress: I. Carbon assimilation and biomass production

Influence of annual weather on growth of pedunculate oak in southern Sweden

Contact Info

Product

Resources

About

Starch and soluble carbohydrates in leaves of water-stressed oak saplings

Abstract: Summary — Four-year-old potted saplings of Quercus petraea (Matt) Liebl were exposed to water shortage by withholding irrigation. After

Cited by 52 publications

References 24 publications

Morphological and physiological responses of oak seedlings (Quercus petraea and Q. robur) to moderate drought

Morphological and physiological responses of oak seedlings (Quercus petraea and Q. robur) to moderate drought

Ontogeny affects response of northern red oak seedlings to elevated CO2 and water stress: I. Carbon assimilation and biomass production

Influence of annual weather on growth of pedunculate oak in southern Sweden

Contact Info

Product

Resources

About

Ontogeny affects response of northern red oak seedlings to elevated CO₂ and water stress: I. Carbon assimilation and biomass production