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Marine Biology

, Volume 158, Issue 6, pp 1403–1416 | Cite as

Leaf reddening in the seagrass Thalassia testudinum in relation to anthocyanins, seagrass physiology and morphology, and plant protection

  • Alyssa B. Novak
  • Frederick T. Short
Original Paper

Abstract

Numerous seagrass species growing in high-light environments develop red coloration in otherwise green leaves, yet the ecophysiology of leaf reddening in seagrasses is poorly understood. To increase our understanding of the process of leaf reddening in Thalassia testudinum found in the lower Florida Keys (USA), we identified the molecules responsible for red coloration in leaves and compared physiological, morphological, and growth attributes of entirely red-leafed shoots to entirely green-leafed shoots. We determined that four anthocyanin molecules are responsible for red coloration in leaves. In addition, we found that red leaves had higher concentrations of photoprotective pigments (anthocyanins and UV-absorbing compounds), higher effective quantum yields (ΔF/Fm′) at midday, and were shorter, narrower, and weighed less than green leaves. No significant difference in growth rates was observed between red- and green-leafed shoots, but patches of red-leafed shoots had shorter canopy heights and smaller LAI compared to patches of green-leafed shoots. Our results demonstrate that leaf reddening in T. testudinum is caused by high concentrations of anthocyanins, is associated with physiological and morphological attributes, and acts as a sunscreen since red leaves were able to maintain high effective quantum yields at high light intensities.

Keywords

Anthocyanin Content Maximum Quantum Yield Shoot Density Effective Quantum Yield Thalassia Testudinum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We thank Cathy Short for technical editing and two anonymous reviewers for their comments. Additional valuable assistance from Richard Novak, Christopher Mercer, Pamelia Fraungruber, Lauren Gaskell, Paul Sokoloff, Nicole Sarrette, Jon Felch, and Holly Bayley. Research support from: the National Oceanic and Atmospheric Administration’s Nancy Foster Scholarship, the Department of Natural Resources and Environment at the University of New Hampshire, SeagrassNet, and Mote Marine Laboratory. All research for this project was conducted under National Marine Sanctuary Permit FKNMS-2007-042. Jackson Estuarine Laboratory contribution number 502.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Department of Natural Resources and the Environment, Jackson Estuarine LaboratoryUniversity of New HampshireDurhamUSA

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