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Photosynthetica

, Volume 56, Issue 2, pp 698–706 | Cite as

Leaf plasticity and stomatal regulation determines the ability of Arundo donax plantlets to cope with water stress

  • A. Romero-Munar
  • E. Baraza
  • J. Cifre
  • C. Achir
  • J. Gulías
Original paper

Abstract

The objective of this study was to evaluate the response of the giant reed (Arundo donax L.) to drought stress at early stages, as well as to determine the effects of limited soil water availability on plant growth, gas exchange, and water-use efficiency. Plantlets of a commercial clone were grown in a greenhouse under two water treatments: at 100% of field capacity and progressive drought for 66 days (until 20% of field capacity). Soil water content, leaf elongation rate, plant water consumption, and gas-exchange parameters were measured throughout the experiment. Total plant biomass, leaf water, and osmotic potential were determined at the end of the experiment. Plant growth and leaf gas-exchange parameters were significantly affected by soil water availability, but only when it was below 40% of field capacity. At early stages, Arundo donax showed drought stress acclimation due to leaf plasticity, stomatal regulation, and osmotic adjustment.

Additional key words

early stage osmotic potential stomatal conductance water deficit 

Abbreviations

Cc

chloroplastic CO2 concentration

Chl

chlorophyll

Ci

substomatal CO2 concentration

DAT

days after transplantation

FC

field capacity percentage

gs

stomatal conductance

gm

mesophyll conductance

H2Oc

total water consumption

Jmax

the potential light- saturated electron transport rate

Jflu

the electron transport rate

PN

net photosynthetic rate

RD

respiration rate in the light

Rn

the respiratory rate in the absence of light

Vcmax

the maximum Rubisco carboxylation rate

WD

water-stressed

WUE

water-use efficiency

WW

well-watered.

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Supplementary material

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Copyright information

© The Institute of Experimental Botany 2018

Authors and Affiliations

  • A. Romero-Munar
    • 1
  • E. Baraza
    • 1
  • J. Cifre
    • 1
  • C. Achir
    • 1
  • J. Gulías
    • 1
  1. 1.Research Group on Plant Biology under Mediterranean Conditions. Department of Biology. University of the Balearic IslandsCtra. ValldemossaPalma de MallorcaSpain

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