Photosynthetic parameters of Juglans nigra trees are linked to cumulative water stress
The influence of water deficits and drought on tree physiological processes, growth, and survival has been the focus of substantial research efforts and debate over the past decades, but there is still a need to quantitatively link finer scale mechanistic explanations of the influence of water statu...
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| Published in | Canadian journal of forest research Vol. 49; no. 7; pp. 752 - 758 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
Ottawa
NRC Research Press
01.07.2019
Canadian Science Publishing NRC Research Press |
| Subjects | |
| Online Access | Get full text |
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| Abstract | The influence of water deficits and drought on tree physiological processes, growth, and survival has been the focus of substantial research efforts and debate over the past decades, but there is still a need to quantitatively link finer scale mechanistic explanations of the influence of water status with the physiological responses of trees, particularly for those past the sapling stage. Hence, the objective of this study was to link accumulated water stress during the growing season to leaf physiological response mechanisms of Juglans nigra L. trees. Results showed that trees subjected to higher cumulative water stress had lower maximum light-saturated photosynthesis (A
max
), initiated net photosynthesis at higher light levels (I
c
), and displayed reduced effectiveness of CO
2
fixation per photons absorbed (Q
e
) at the bottom and upper positions along the vertical canopy gradient. Results suggest that water stress integral (S
ψ
), a variable that takes into account accumulated water deficits, would be useful to help future research efforts aimed at investigating responses to drought in trees past the sapling stage. |
|---|---|
| AbstractList | The influence of water deficits and drought on tree physiological processes, growth, and survival has been the focus of substantial research efforts and debate over the past decades, but there is still a need to quantitatively link finer scale mechanistic explanations of the influence of water status with the physiological responses of trees, particularly for those past the sapling stage. Hence, the objective of this study was to link accumulated water stress during the growing season to leaf physiological response mechanisms of Juglans nigra L. trees. Results showed that trees subjected to higher cumulative water stress had lower maximum light-saturated photosynthesis ([A.sub.max]), initiated net photosynthesis at higher light levels (Ic), and displayed reduced effectiveness of C[O.sub.2] fixation per photons absorbed ([Q.sub.e]) at the bottom and upper positions along the vertical canopy gradient. Results suggest that water stress integral ([S.sub.[psi]]), a variable that takes into account accumulated water deficits, would be useful to help future research efforts aimed at investigating responses to drought in trees past the sapling stage. The influence of water deficits and drought on tree physiological processes, growth, and survival has been the focus of substantial research efforts and debate over the past decades, but there is still a need to quantitatively link finer scale mechanistic explanations of the influence of water status with the physiological responses of trees, particularly for those past the sapling stage. Hence, the objective of this study was to link accumulated water stress during the growing season to leaf physiological response mechanisms of Juglans nigra L. trees. Results showed that trees subjected to higher cumulative water stress had lower maximum light-saturated photosynthesis (A max ), initiated net photosynthesis at higher light levels (I c ), and displayed reduced effectiveness of CO 2 fixation per photons absorbed (Q e ) at the bottom and upper positions along the vertical canopy gradient. Results suggest that water stress integral (S ψ ), a variable that takes into account accumulated water deficits, would be useful to help future research efforts aimed at investigating responses to drought in trees past the sapling stage. The influence of water deficits and drought on tree physiological processes, growth, and survival has been the focus of substantial research efforts and debate over the past decades, but there is still a need to quantitatively link finer scale mechanistic explanations of the influence of water status with the physiological responses of trees, particularly for those past the sapling stage. Hence, the objective of this study was to link accumulated water stress during the growing season to leaf physiological response mechanisms of Juglans nigra L. trees. Results showed that trees subjected to higher cumulative water stress had lower maximum light-saturated photosynthesis (Amax), initiated net photosynthesis at higher light levels (Ic), and displayed reduced effectiveness of CO2 fixation per photons absorbed (Qe) at the bottom and upper positions along the vertical canopy gradient. Results suggest that water stress integral (Sψ), a variable that takes into account accumulated water deficits, would be useful to help future research efforts aimed at investigating responses to drought in trees past the sapling stage. The influence of water deficits and drought on tree physiological processes, growth, and survival has been the focus of substantial research efforts and debate over the past decades, but there is still a need to quantitatively link finer scale mechanistic explanations of the influence of water status with the physiological responses of trees, particularly for those past the sapling stage. Hence, the objective of this study was to link accumulated water stress during the growing season to leaf physiological response mechanisms of Juglans nigra L. trees. Results showed that trees subjected to higher cumulative water stress had lower maximum light-saturated photosynthesis ([A.sub.max]), initiated net photosynthesis at higher light levels (Ic), and displayed reduced effectiveness of C[O.sub.2] fixation per photons absorbed ([Q.sub.e]) at the bottom and upper positions along the vertical canopy gradient. Results suggest that water stress integral ([S.sub.[psi]]), a variable that takes into account accumulated water deficits, would be useful to help future research efforts aimed at investigating responses to drought in trees past the sapling stage. Key words: climate change, drought, gas exchange, walnut, water stress. L'influence des deficits hydriques et de la secheresse sur les processus physiologiques, la croissance et la survie des arbres a ete le centre d'interet d'importants efforts de recherche et de discussions au cours de la derniere decennie, mais encore faudrait-il relier quantitativement a une echelle plus fine les explications mecanistes de l'influence du statut hydrique aux reactions physiologiques des arbres, particulierement chez ceux qui ont franchi le stade de gaule. Par consequent, l'objectif de cette etude consistait a relier le stress hydrique accumule durant la saison de croissance aux mecanismes de reaction physiologique des feuilles de Juglans nigra L. Les resultats montrent que les arbres soumis a un stress hydrique cumulatif plus eleve avaient un niveau maximum de photosynthese au point de saturation lumineuse ([A.sub.max]) inferieur, atteignaient la photosynthese nette a des niveaux de lumiere plus eleves (Ic) et montraient une efficacite de fixation du C[O.sub.2] par photon absorbe ([Q.sub.e]) reduite dans les positions inferieure et superieure le long d'un gradient vertical dans le couvert forestier. Les resultats indiquent que l'integrale du stress hydrique ([S.sub.[psi]]), une variable qui tient compte des deficits hydriques accumules, serait utile pour assister les futurs efforts de recherche visant a etudier les reactions a la secheresse chez les arbres qui ont franchi le stade de gaule. [Traduit par la Redaction] Mots-cles: changement climatique, secheresse, echange gazeux, noyer, stress hydrique. |
| Abstract_FL | L’influence des déficits hydriques et de la sécheresse sur les processus physiologiques, la croissance et la survie des arbres a été le centre d’intérêt d’importants efforts de recherche et de discussions au cours de la dernière décennie, mais encore faudrait-il relier quantitativement à une échelle plus fine les explications mécanistes de l’influence du statut hydrique aux réactions physiologiques des arbres, particulièrement chez ceux qui ont franchi le stade de gaule. Par conséquent, l’objectif de cette étude consistait à relier le stress hydrique accumulé durant la saison de croissance aux mécanismes de réaction physiologique des feuilles de Juglans nigra L. Les résultats montrent que les arbres soumis à un stress hydrique cumulatif plus élevé avaient un niveau maximum de photosynthèse au point de saturation lumineuse (A
max
) inférieur, atteignaient la photosynthèse nette à des niveaux de lumière plus élevés (I
c
) et montraient une efficacité de fixation du CO
2
par photon absorbé (Q
e
) réduite dans les positions inférieure et supérieure le long d’un gradient vertical dans le couvert forestier. Les résultats indiquent que l’intégrale du stress hydrique (S
ψ
), une variable qui tient compte des déficits hydriques accumulés, serait utile pour assister les futurs efforts de recherche visant à étudier les réactions à la sécheresse chez les arbres qui ont franchi le stade de gaule. [Traduit par la Rédaction] |
| Audience | Academic |
| Author | Jacobs, Douglass F Gauthier, Martin-Michel |
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| CitedBy_id | crossref_primary_10_1016_j_plaphy_2023_107939 crossref_primary_10_1186_s13595_022_01143_x |
| Cites_doi | 10.1086/284319 10.1093/treephys/tpt012 10.1016/j.agrformet.2014.01.001 10.1093/forestscience/31.3.617 10.1093/treephys/tpr116 10.1093/treephys/4.4.315 10.1016/j.foreco.2018.03.036 10.1007/s00442-015-3380-9 10.1111/gcb.13030 10.1104/pp.010400 10.1139/b75-137 10.1139/b75-009 10.1093/treephys/tpw066 10.1111/j.1365-2486.2005.001082.x 10.1093/aob/mcv064 10.1093/treephys/18.7.431 10.1890/ES15-00203.1 10.1016/S0168-1923(99)00079-9 10.1093/treephys/tpy037 10.1111/j.1365-3040.2011.02424.x 10.1093/forestscience/55.3.221 10.1111/nph.12548 10.1890/13-1942.1 10.1007/s13595-011-0135-6 10.1093/treephys/11.3.271 10.1093/jxb/erw062 10.1093/forestscience/20.4.317 10.1093/treephys/18.5.307 10.1890/080016 10.1016/j.agrformet.2017.08.026 10.1007/s00468-018-1706-z 10.1007/BF00010099 10.1093/treephys/tpt032 10.1111/pce.12417 10.1104/pp.106.090092 10.1016/j.foreco.2009.11.004 10.18637/jss.v066.i05 10.1007/s10457-015-9795-9 10.1016/B978-0-12-425040-6.50005-9 10.1016/j.foreco.2009.09.001 10.1093/treephys/tpw126 10.1016/0378-1127(82)90010-X 10.2307/1938853 10.1080/14620316.2006.11512082 10.1093/treephys/8.1.1 |
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| SubjectTerms | Aquatic resources Carbon dioxide Carbon dioxide fixation Carbon sequestration changement climatique climate change Climatic changes Drought Droughts gas exchange Influence Juglans nigra Light levels noyer Photons Photosynthesis Physiological aspects Physiological responses Physiology Phytochemistry Scientific equipment and supplies industry Stress stress hydrique Studies sécheresse Trees United States Vertical orientation walnut Water Water stress échange gazeux |
| Title | Photosynthetic parameters of Juglans nigra trees are linked to cumulative water stress |
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