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Differential photosynthetic and survival responses to soil drought in two evergreen Nothofagus species

Différence de réponse de la photosynthèse et de la survie en situation de sécheresse édaphique dans deux espéces à feuilles persistantes de Nothofagus

Annals of Forest Science volume 64, pages 447–452 (2007)Cite this article

Abstract

We asked if differences in distribution between Nothofagus nitida and N. dombeyi were associated with differences in drought tolerance. Survival, gas exchange and chlorophyll fluorescence were measured on seedlings subjected to a gradual drought. At a predawn leaf water potential (Ψm) of −2.7 MPa, survival of N. nitida was 50%, compared to 100% in N. dombeyi. Under well-watered conditions, the two species displayed similar stomatal conductance (g w ) and transpiration (E), but net photosynthesis (A) and instantaneous water-use efficiency (WUE i ) were slightly higher in N. nitida. A, E and g w declined in N. nitida along the gradual drought but increased in N. dombeyi at a Ψm between −1.5 and −2.5 MPa, and declined then drastically at a Ψm below < −2.5 MPa. As N. dombeyi was able to maintain A at higher levels despite declining g w , this species displayed significantly increased WUE i at Ψm below −2.5 MPa. Photochemical efficiency of PSII in the light (ΔF/Fmr) and photochemical quenching (qP) were always lower in N. nitida and along with the photochemical efficiency in the dark (Fv/Fm) they declined in both species. Non-photochemical quenching (NPQ) increased slowly in N. dombeyi along with the gradual drought, whilst it decreased in N. nitida. These results show that differences in drought tolerance are in agreement with sorting of Nothofagus species along moisture gradients in south-central Chile.

Résumé

Nous nous sommes demandés si des différences de distribution entre Nothofagus nitida et N. dombeyi sont associées à des différences de tolérance à la sécheresse. La survie, les échanges gazeux et la fluorescence de la chlorophylle ont été mesurés sur de jeunes plants soumis à une sécheresse croissante. Lorsque le potentiel hydrique de base (Ψm) atteignait −2.7 MPa la survie était de 50 et de 100 % pour N. nitida, et N. dombeyi, respectivement. Dans des conditions d’alimentation hydrique suffisante, les deux espèces ont présenté des valeurs voisines de conductance stomatique (g w ) et de transpiration (E) mais la photosynthèse nette (A) et l’effitience instantanée d’utilisation de l’eau (WUE i ) étaient légèrement plus élevées pour N. nitida. A, E et g w ont diminué pour N. nitida au cours d’une sécheresse croissante mais ont légèrement augmenté pour N. dombeyi pour des valeurs de Ψm comprises entre −1.5 et −2.5 MPa, puis diminué fortement à des valeurs de Ψm inférieures à −2.5 MPa. Par conséquent, N. dombeyi a présenté des valeurs de WUE i plus élevée que N. nitida à des niveaux de Ψm inferieurs à −2.5 MPa. L’effitience photochimique du PSII à la lumière (ΔF/F m ) et le quenching photochimique (qp) étaient toujours inférieurs pour N. nitida. L’effitience photochimique à l’obscurité (F v /F m ) ainsi que ΔFjFm ont diminué dans les deux espèces. Le quenching non-photochimique (NPQ) a légèrement augmenté pour N. dombeyi avec la sécheresse, alors qu’il diminuait pour N. nitida. Ces résultats montrent que des différences de tolérance à la sécheresse correspondent à la distribution d’espèces de Nothofagus le long de gradients d’humidité dans le centre sud du Chili.

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Authors and Affiliations

  1. Departamento de Botánica, Universidad de Conceptión, Edmundo Larenas 1290, casilla 160-C, Conceptión, Chile

    Frida I. Piper, Luis J. Corcuera & Christopher Lusk

  2. Instituto de Botánica, Universidad Austral, Valdivia, Chile

    Miren Alberdi

  3. Department of Biological Sciences, Macquarie University, 2109, NSW, Australia

    Christopher Lusk

Authors
  1. Frida I. Piper
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  2. Luis J. Corcuera
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  3. Miren Alberdi
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  4. Christopher Lusk
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Correspondence to Frida I. Piper.

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Piper, F.I., Corcuera, L.J., Alberdi, M. et al. Differential photosynthetic and survival responses to soil drought in two evergreen Nothofagus species. Ann. For. Sci. 64, 447–452 (2007). https://doi.org/10.1051/forest:2007022

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  • DOI: https://doi.org/10.1051/forest:2007022

Annals of Forest Science

ISSN: 1297-966X