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Photosynthetica

, Volume 47, Issue 2, pp 304–308 | Cite as

Effects of rapidly imposed water deficit on photosynthetic parameters of three C4 grasses

  • A.S. Soares-Cordeiro
  • A.E. Carmo-Silva
  • A. Bernardes da Silva
  • J. Marques da Silva
  • A.J. Keys
  • M.C. Arrabaça
Brief Communication

Abstract

Water deficit, when rapidly imposed on three C4 grasses of the different metabolic subtypes, Paspalum dilatatum Poiret (NADP-malic enzyme), Cynodon dactylon (L.) Pers (NAD-malic enzyme) and Zoysia japonica Steudel (phosphoenolpyruvate carboxykinase), caused decreases in photosynthetic rates, in the quantum yield of PS II and photochemical quenching, and in the activities of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and phosphoenolpyruvate carboxylase (PEPC). The results provide evidence for non-stomatal limitations of photosynthesis differing in nature between the three species.

Additional key words

chlorophyll a fluorescence drought stress NAD-malic enzyme NADP-malic enzyme phosphoenolpyruvate carboxykinase phosphoenolpyruvate carboxylase photosynthetic capacity Rubisco 

Abbreviations

DM

dry mass

NAD-ME

NAD-malic enzyme

NADP-ME

NADP-malic enzyme

NPQ

non-photochemical quenching

PEPC

phosphoenolpyruvate carboxylase

PEPCK

phosphoenolpyruvate carboxykinase

Pmax

rate of photosynthesis at saturating CO2 and high irradiance

PPFD

photosynthetic photon flux density

PSII

photosystem II

qP

photochemical quenching

Rubisco

ribulose-1,5-bisphosphate carboxylase/oxygenase

RWC

leaf relative water content

Vmax

PEPC maximal activity

Vt

Rubisco total activity

ΦPSII

effective quantum yield of PS II electron transport

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • A.S. Soares-Cordeiro
    • 1
  • A.E. Carmo-Silva
    • 1
    • 2
  • A. Bernardes da Silva
    • 1
  • J. Marques da Silva
    • 1
  • A.J. Keys
    • 2
  • M.C. Arrabaça
    • 1
  1. 1.Centro de Engenharia Biológica and Departamento de Biologia VegetalFaculdade de Ciências da Universidade de LisboaLisboaPortugal
  2. 2.Department of Plant Sciences, Centre for Crop Genetic ImprovementRothamsted ResearchHarpenden HertfordshireUK

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