Photosynthetica

, Volume 51, Issue 4, pp 574–582

Effects of drought stress on the evergreen Quercus ilex L., the deciduous Q. robur L. and their hybrid Q. × turneri Willd.

Original Papers

DOI: 10.1007/s11099-013-0058-6

Cite this article as:
Koller, S., Holland, V. & Brüggemann, W. Photosynthetica (2013) 51: 574. doi:10.1007/s11099-013-0058-6

Abstract

Five-year-old trees of deciduous Quercus robur L., evergreen Q. ilex L., and their semideciduous hybrid, Q. × turneri Willd. (var. pseudoturneri), growing in pots, were subjected to drought stress by withholding water for 18–22 days, until leaf water potentials decreased below −2 MPa. Gas-exchange rates, oxygen evolution, and modulated chlorophyll (Chl) fluorescence measurements revealed that by strong stomata closure and declining photosynthetic capacity down to approximately 50%, all three taxa responded with strongly reduced photosynthesis rates. In Q. robur, photochemical quenching of the drought-stressed plants was much lower than in nonstressed controls. Dissection of the occurring events in the photosynthetic electron transport chain by fast Chl fluorescence induction analysis with the JIP-test were discussed.

Additional key words

chlorophyll fluorescence gas exchange oak OJIP-test Quercus 

Abbreviations

Chl

chlorophyll

Ci

intercellular CO2 mole fraction

DS

drought stress

ET

electron transport

Fv

maximal variable fluorescence

Fv/Fm

maximum quantum yield of primary photochemistry

gs

stomatal conductance of water vapour

LWC

leaf water content

NPQ

nonphotochemical quenching

PAM

pulse-amplitude-modulated

PAR

photosynthetically active radiation

Pmax

photosynthetic capacity (capacity of the photosynthetic system, if photorespiration and stomatal effects are avoided due to high CO2 concentration)

PN

net photosynthetic rate

PIabs

performance index on absorption basis

PS

photosystem

Q

plastochinon

qI

photoinhibitory quenching

qP

photochemical quenching

RC

reaction centre

VI

relative variable fluorescence at I-step (30 μs)

VJ

relative variable fluorescence at I-step (30 μs)

VK

relative variable fluorescence at K-step (300 μs)

VIP

IP-phase (1-VI)

ΦD0

quantum yield of energy dissipation

ΦE0

quantum yield of electron transport

ΦP0

maximum quantum yield of primary photochemistry

Ψleaf

predawn leaf water potential

Ψ0

probability that a trapped exciton moves an electron into the electron transport chain beyond QA

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Biodiversity and Climate Research Center Frankfurt (BiK-F)FrankfurtGermany
  2. 2.Department of Ecology, Evolution and DiversityGoethe University FrankfurtFrankfurtGermany

Personalised recommendations