Perception of Environmental Signals by a Marine Diatom

Author:

Falciatore Angela1,d'Alcalà Maurizio Ribera2,Croot Peter3,Bowler Chris1

Affiliation:

1. Laboratories of Molecular Plant Biology and

2. Biological Oceanography, Stazione Zoologica Anton Dohrn, Villa Comunale, I-80121 Naples, Italy.

3. Department of Marine Chemistry and Geology, Netherlands Institute for Sea Research (NIOZ), Postbus 59, 1790 AB Den Burg, Texel, Netherlands.

Abstract

Diatoms are a key component of marine ecosystems and are extremely important for the biogeochemical cycling of silica and as contributors to global fixed carbon. However, the answers to fundamental questions such as what diatoms can sense in their environment, how they respond to external signals, and what factors control their life strategies are largely unknown. We generated transgenic diatom cells containing the calcium-sensitive photoprotein aequorin to determine whether changes in calcium homeostasis are used to respond to relevant environmental stimuli. Our results reveal sensing systems for detecting and responding to fluid motion (shear stress), osmotic stress, and iron, a key nutrient that controls diatom abundance in the ocean.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference34 articles.

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2. Apt K. E., Kroth-Pancic P. G., Grossman A. R., Mol. Gen. Genet. 252, 572 (1996).

3. Transformation of Nonselectable Reporter Genes in Marine Diatoms

4. For further details see Science Online at www.sciencemag.org/feature/data/1048586.shl.

5. Transfected Aequorin in the Measurement of Cytosolic Ca2+ Concentration ([Ca2+]c)

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