Response of Pinus pinaster Ait. provenances at early age to water supply. I. Water relation parameters

Fernández, Manuel; Gil, Luis; Pardos, J.A.

doi:10.1051/forest:19990209

Cited by 46 publications

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“…[18], in agreement with Tognetti et al on P. halepensis [35], although these last authors recorded higher values than were observed in our study. This difference may be due to the fact that we did not re-hydrate our samples or to the fact that the seedlings we examined were younger.…”

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Resistance to water stress in seedlings of eight European provenances of Pinus halepensis Mill.

et al. 2001

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-In this study, pressure/volume curves were performed on 24-week-old seedlings of eight European provenances of Pinus halepensis Mill. subsp. halepensis after one week of water stress (-0.033, -0.4, -0.8, -1.2, -1.6 MPa). P. halepensis showed osmotic adjustments as a response to water stress, although the response varied between the provenances. Apoplastic water remained relatively constant. The elasticity module did not differ significantly. Water deficit at incipient plasmolysis and water content decreased as the stress increased. Water potential was markedly negative, even in seedlings not subjected to stress. The provenances from less xeric sites behaved similarly to species from non-arid sites, while those from more xeric sites displayed the strategy typical of drought-tolerant species. The impact on all provenances of one week of low-intensity water stress (-0.4 MPa) was slight. As the stress increased, the response varied between the provenances: N-Eubea > Kassandra > Litorale tarantino ≅ Guardiola > Otricoli ≅ E-Bouches du Rhône ≥ Hérault ≅ N-Vaucluse (in decreasing order).Aleppo pine / drought resistance / geographic variation / pressure-volume curves / provenances Résumé -Résistance au stress hydrique des plantules appartenant à huit provenances européennes de Pinus halepensis Mill. Sur des plantules âgées de 24 semaines, appartenant à 8 provenances de Pinus halepensis (Mill.) subsp. halepensis, des courbes pression-volume ont été effectuées après une semaine de stress hydrique (-0,033, -0,4, -0,8, -1,2, -1,6 MPa). P. halepensis a montré des ajustements osmotiques en réponse au stress hydrique, bien que de façon différenciée parmi les provenances. L'eau apoplastique a été relativement constante. Le module d'élasticité n'a pas différé significativement. Le déficit hydrique en début de plasmolyse et la teneur en eau ont baissé avec l'augmentation du stress. Le potentiel hydrique a été très négatif, même en absence de stress. Les semences provenant des milieux les moins secs se sont comporté de façon identique aux espèces des milieux non arides, tandis que les provenances originaires des milieux les plus secs ont révélé la stratégie caractéristique des espèces tolérant la sécheresse. En conclusion les provenances ont été insuffisamment influencées par une semaine de stress hydrique de faible intensité. En présence d'un accroissement du stress, les réponses ont permis de différencier les provenances : N-Eubea > Kassandra > Litorale tarantino ≅ Guardiola > Otricoli ≅ E-Bouches du Rhône ≥ Hérault ≅ N-Vaucluse (en ordre décroissant).courbes pression-volume / Pin d'Alep / provenances / résistance à la sécheresse / variation géographique Ann. For. Sci. 58 (2001) [663][664][665][666][667][668][669][670][671][672] 663

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“…The reduction of Ψ π100 as the water potential of the substrate decreases has already been observed and has been considered a clear response to drought [18,35,36]. Five and a half month old control seedlings of three North American conifers (Picea mariana Mill., Picea glauca Moench, Pinus banksiana Lamb.)…”

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Resistance to water stress in seedlings of eight European provenances of Pinus halepensis Mill.

et al. 2001

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“…On the other hand, under water shortage conditions (R2), the decrease of osmotic potential, bulk elasticity modulus and turgor to dry weight ratio previously reported [16] and the increase of intrinsic water use efficiency (A/g wv ) indicate strategies of acclimation to water stress, as it has been shown in some conifers [3,24,48,59].…”

Section: Discussionmentioning

confidence: 99%

“…After germination, seedlings were taken to open air under a translucid cover and sown in containers filled with 230 ml of a sand:black peat mixture (2:1 v/v). Air temperatures were recorded [16]. Seedlings were carefully watered twice a week for two months.…”

Section: Methodsmentioning

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“…Although sometimes these differences are only expressed within a given rank of plant water potential [3,9]. Significant differences between provenances were found concerning physiological adaptations to water stress in maritime pine young seedlings [16,27,41,42,43,50]. So, the need for a deeper basic knowledge on water stress adaptation of Pinus pinaster [36] in those situations is strengthened by its applicability to selection programmes.…”

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Effects of water supply on gas exchange in Pinus pinaster Ait. provenances during their first growing season

2000

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-Gas exchange parameters were monitored during the first growing season on Pinus pinaster young seedlings belonging to six provenances and submitted to two water supply regimes in the open air under cover. Significant differences were found between water supply regimes and measurement dates; sometimes also between provenances. Gas exchange rate responses to needle water potential were similar for all the provenances, and rate changes were only detected as water potential went down to less than -1.3 MPa. The Iberian provenances, in contrast to the Landes, showed a tendency to save water at the end of Spring, which indicates an adaptation to locations with Summer drought. The growth differences between provenances were not expressed in terms of differences in the instantaneous net photosynthetic rate, since this will depend on other factors, such as seedling water status and the time that the measurement was made. However, provenance growth differences may be partially explained by the differences in water use efficiency and nitrogen productivity. maritime pine / early selection / gas exchange parameters Résumé -Effets de l'alimentation en eau sur les échanges gazeux des provenances de Pinus pinaster Ait. au cours de leur première saison de végétation. Les échanges gazeux ont été étudiés au cours de la première saison de végétation de jeunes semis de Pinus pinaster appartenant à six provenances et soumis à deux régimes d'alimentation en eau sous couvert en plein air. Des différences significatives ont été trouvées entre les régimes d'alimentation en eau et les dates de mesures, parfois aussi entre les provenances. Les réponses des taux d'échanges gazeux au potentiel hydrique des aiguilles étaient similaires entre toutes les provenances, et les changements de taux ne furent seulement détectés que lorsque le potentiel hydrique devint inférieur à -1,3 MPa. Les provenances ibériques, contrairement à celles des Landes, montrèrent une tendance à économiser l'eau à la fin du printemps, ce qui indique une adaptation à la situation de sécheresse estivale. Les différences de croissance entre provenances ne se sont pas exprimées en terme de différences de taux nets instantanés de photosynthèse, car cela dépend aussi d'autres facteurs comme le statut hydrique des semis et de l'époque où les mesures ont été effectuées. Cependant, les différences d'accroissements entre provenances peuvent être partiellement expliquées par des différences dans l'efficience d'utilisation de l'eau et de l'azote. pin maritime / sélection précoce / échanges gazeux

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Water-Based Forest Management of Mediterranean Pine Forests

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Morcillo

et al. 2021

Pines and Their Mixed Forest Ecosystems in the Mediterranean Basin

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Response of Pinus pinaster Ait. provenances at early age to water supply. I. Water relation parameters

Cited by 46 publications

References 28 publications

Resistance to water stress in seedlings of eight European provenances of Pinus halepensis Mill.

Resistance to water stress in seedlings of eight European provenances of Pinus halepensis Mill.

Effects of water supply on gas exchange in Pinus pinaster Ait. provenances during their first growing season

Water-Based Forest Management of Mediterranean Pine Forests

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