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

Frida I. Piper; Luis J. Corcuera; Miren Alberdi; Christopher Lusk

doi:10.1051/forest:2007022

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

Frida I. Piper^*, Luis J. Corcuera, Miren Alberdi, Christopher Lusk

^*Corresponding author for this work

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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 (ψ_m) 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 ψ_m between 1.5 and 2.5 MPa, and declined then drastically at a ψ_m 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 ψ_m below -2.5 MPa. Photochemical efficiency of PSII in the light (ΔF/Fm′) 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.

Original language	English
Pages (from-to)	447-452
Number of pages	6
Journal	Annals of Forest Science
Volume	64
Issue number	4
DOIs	https://doi.org/10.1051/forest:2007022
Publication status	Published - Jun 2007

Bibliographical note

Keywords

Drought tolerance
Gas exchange
Nothofagus
Soil water potential
Water use efficiency

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title = "Differential photosynthetic and survival responses to soil drought in two evergreen Nothofagus species",

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 (gw) and transpiration (E), but net photosynthesis (A) and instantaneous water-use efficiency (WUEi) were slightly higher in N. nitida. A, E and gw 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 gw, this species displayed significantly increased WUEi at ψm below -2.5 MPa. Photochemical efficiency of PSII in the light (ΔF/Fm′) 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.",

keywords = "Drought tolerance, Gas exchange, Nothofagus, Soil water potential, Water use efficiency",

author = "Piper, {Frida I.} and Corcuera, {Luis J.} and Miren Alberdi and Christopher Lusk",

note = "Copyright 2007 EDP Sciences, First published in Annals of forest science, Vol. 64, No. 4, published by EDP Sciences. The original article can be found athttp://dx.doi.org/10.1051/forest:2007022",

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doi = "10.1051/forest:2007022",

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T1 - Differential photosynthetic and survival responses to soil drought in two evergreen Nothofagus species

AU - Piper, Frida I.

AU - Corcuera, Luis J.

AU - Alberdi, Miren

AU - Lusk, Christopher

PY - 2007/6

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AB - 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 (gw) and transpiration (E), but net photosynthesis (A) and instantaneous water-use efficiency (WUEi) were slightly higher in N. nitida. A, E and gw 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 gw, this species displayed significantly increased WUEi at ψm below -2.5 MPa. Photochemical efficiency of PSII in the light (ΔF/Fm′) 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.

KW - Drought tolerance

KW - Gas exchange

KW - Nothofagus

KW - Soil water potential

KW - Water use efficiency

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DO - 10.1051/forest:2007022

M3 - Article

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VL - 64

SP - 447

EP - 452

JO - Annals of Forest Science

JF - Annals of Forest Science

SN - 1286-4560

IS - 4

ER -

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

Abstract

Bibliographical note

Keywords

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