Distinctive Photosystem II Photoinactivation and Protein Dynamics in Marine Diatoms

• DOI: 10.1104/pp.111.178772
• Publication Date: 2011-05-27T00:27:23Z
• Authors: Hongyan Wu; Amanda M. Cockshutt; Avery McCarthy; Douglas A. Campbell
• Keywords: Thalassiosira pseudonana; Oxygen evolution

Abstract Diatoms host chlorophyll a/c chloroplasts distinct from green chloroplasts. now dominate the eukaryotic oceanic phytoplankton, in part through their exploitation of environments with variable light. We grew marine diatoms across a range temperatures and then analyzed PSII function subunit turnover during an increase light to mimic upward mixing event. The small diatom Thalassiosira pseudonana initially responds increased photoinactivation under blue or white rapid acceleration photosystem II (PSII) repair cycle. Increased red provoked only modest but triggered clearance subpool PsbA. Furthermore, PsbD PsbB content was greater than PsbA content, indicating large pool partly assembled cycle intermediates lacking initial replacement rates for (D2) were, surprisingly, comparable higher those (D1), even supposedly stable (CP47) dropped rapidly upon shift, showing novel aspect protein diatoms. Under sustained high light, T. induces nonphotochemical quenching, which correlates stabilization pool. larger Coscinodiscus radiatus showed generally similar responses had smaller allocation complexes relative total nearly equal stiochiometries subunits. Fast multiple subunits, pools intermediates, photoprotective induction quenching are important interacting factors, particularly diatoms, withstand exploit high, fluctuating