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Biologia Plantarum

, Volume 56, Issue 1, pp 15–24 | Cite as

Photosynthetic and leaf anatomical characteristics of Castanea sativa: a comparison between in vitro and nursery plants

  • P. L. Sáez
  • L. A. Bravo
  • K. L. Sáez
  • M. Sánchez-Olate
  • M. I. Latsague
  • D. G. Ríos
Original Papers

Abstract

The anatomic and functional leaf characteristics related to photosynthetic performance of Castanea sativa growing in vitro and in nursery were compared. The irradiance saturated photosynthesis in in vitro grown plantlets was significantly lower compared to nursery plants (65 vs. 722 μmol m−2 s−1). The maximum photosynthetic rate (PNmax) was 4.0 and 10.0 μmol(CO2) m−2 s−1 in in vitro microshoots and nursery plant leaves, respectively. Carboxylation efficiency (CE) and electron transport rate (ETR) were three-folds higher in nursery plants than in microshoots. The nonphotochemical quenching (NPQ) was saturated at 80 μmol m−2 s−1 in microshoots suggesting limited photoprotection by thermal dissipation. The microshoots had wide open, spherical stomata and higher stomatal density than nursery plants and they had almost no epicuticular wax. Consequently, the microshoots had high stomatal conductance and high transpiration rate. These anatomic and functional leaf characteristics are likely major causes of the low survival rates of plantlets after ex vitro transfer.

Additional key words

chloroplasts fluorescence micropropagation net photosynthetic rate stomata transpiration rate 

Abbreviations

BAP

6-benzylaminopurine

CE

carboxylation efficiency

DKW

Driver and Kuniyuki medium

ETR

electron transport rate

gs

stomatal conductance

IBA

indolebutyric acid

NPQ

non-photochemical quenching

PFD

photon flux density

PN

net photosynthetic rate

PS 2

photosystem 2

Qa

primary quinone acceptor of PS 2

qL

photochemical quenching

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Notes

Acknowledgements

The authors would like to thank projects INNOVA BIOBIO No. 4 B3-234 and DIUC 210.142.029-1.0 from the Direction of Investigations of the University of Concepcion, for the financial support of this work and Adrianne Nicotra for review of the manuscript. Patricia L. Sáez thanks CONICYT for her doctoral fellowship.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • P. L. Sáez
    • 1
  • L. A. Bravo
    • 3
    • 4
  • K. L. Sáez
    • 2
  • M. Sánchez-Olate
    • 1
  • M. I. Latsague
    • 5
  • D. G. Ríos
    • 1
  1. 1.Laboratorio Cultivo de Tejidos Vegetales, Facultad de Ciencias Forestales y Centro de BiotecnologíaUniversidad de ConcepciónConcepciónChile
  2. 2.Departamento de Estadística, Facultad de Ciencias Físicas y MatemáticasUniversidad de ConcepciónConcepciónChile
  3. 3.Laboratorio de Fisiología y Biología Molecular Vegetal, Instituto de Agroindustria, Departamento de Ciencias Agronómicas y Recursos Naturales. Facultad de Ciencias Agropecuarias y ForestalesUniversidad de La FronteraTemucoChile
  4. 4.Center of Plant, Soil Interaction and Natural Resources Biotechnology, Scientific and Technological Bioresource NucleusUniversidad de La FronteraTemucoChile
  5. 5.Facultad de Recursos NaturalesUniversidad Católica de TemucoTemucoChile

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