English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Mutualistic symbioses between scleractinian corals and endosymbiotic dinoflagellates ( Symbiodinium  spp.) are the foundation of coral reef ecosystems. For many coral-algal symbioses, prolonged episodes of thermal stress damage the symbiont's photosynthetic capability, resulting in its expulsion from the host. Despite the link between photosynthetic competency and symbiont expulsion, little is known about the effect of thermal stress on the expression of photosystem genes in  Symbiodinium . This study used real-time PCR to monitor the transcript abundance of two important photosynthetic reaction center genes,  psbA  (encoding the D1 protein of photosystem II) and  psaA  (encoding the P 700  protein of photosystem I), in four cultured isolates (representing ITS2-types A13, A20, B1, and F2) and two  in hospite Symbiodinium  spp. within the coral  Pocillopora  spp. (ITS2-types C1b-c and D1). Both cultured and  in hospite Symbiodinium  samples were exposed to elevated temperatures (32°C) over a 7-day period and examined for changes in photochemistry and transcript abundance.  Symbiodinium  A13 and C1b-c (both thermally sensitive) demonstrated significant declines in both  psbA  and  psaA  during the thermal stress treatment, whereas the transcript levels of the other  Symbiodinium  types remained stable. The downregulation of both core photosystem genes could be the result of several different physiological mechanisms, but may ultimately limit repair rates of photosynthetic proteins, rendering some  Symbiodinium  spp. especially susceptible to thermal stress.

Transcriptional Response of Two Core Photosystem Genes in Symbiodinium spp. Exposed to Thermal Stress