Alizée Malnoë
@alizeemalnoe.bsky.social
400 followers
780 following
64 posts
Photosynthesis researcher 🌞 plant biologist 🌱 Associate professor at Indiana University Bloomington malnoelab.com
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Alizée Malnoë
@alizeemalnoe.bsky.social
· Feb 25
The minor antennae of photosystem II contribute to qH-energy dissipation in Arabidopsis
Photosynthesis is a biological process that converts light energy into chemical energy. Excessive light can damage the photosynthetic machinery, so plants have evolved photoprotective mechanisms such as non-photochemical quenching (NPQ). Among the NPQ mechanisms, qH is a form of sustained quenching, dependent on LIPOCALIN IN THE PLASTID (LCNP) and repressed by SUPPRESSOR OF QUENCHING 1 (SOQ1), protecting against abiotic stress. Recently, we showed in Arabidopsis thaliana that qH can occur in the major light-harvesting complexes (Lhcb1, Lhcb2, Lhcb3) but independently of any specific major antenna. Interestingly, in mutants with little or no accumulation of major antennae ( koLHCII, lhcb1, cpsrp43 ), qH can still be induced. Here, we show that the minor antennae can be quenched by qH and remain quenched once isolated. To investigate the role of minor antennae in qH, we combined the soq1 mutant, which displays high qH, with mutations in each minor antenna type (Lhcb4, Lhcb5, or Lhcb6), or with a mutant lacking all minor antennae. None are strictly required for qH to occur. Still, the absence of Lhcb6 decreases qH induction likely due to an indirect effect from the slower electron transport rate and/or a different macro-organization of photosynthetic complexes in the thylakoids. Overall, this work demonstrates that the minor antennae are a secondary target for qH and could serve as an additional safety valve for photoprotective energy dissipation during prolonged stress. ### Competing Interest Statement The authors have declared no competing interest.
www.biorxiv.org
Reposted by Alizée Malnoë
Reposted by Alizée Malnoë
Alizée Malnoë
@alizeemalnoe.bsky.social
· Jul 12
Reposted by Alizée Malnoë
Reposted by Alizée Malnoë
Reposted by Alizée Malnoë
Orit Peleg
@oritpeleg.bsky.social
· Jun 25
Reposted by Alizée Malnoë
Alizée Malnoë
@alizeemalnoe.bsky.social
· Jun 18
Amorphophallus titanum: Stinky plants: Featured plants: Biology Building Greenhouse: Indiana University Bloomington
Learn about the Amorphophallus titanum growing in the Biology Building greenhouse at Indiana University Bloomington.
greenhouse.biology.indiana.edu
Reposted by Alizée Malnoë
Reposted by Alizée Malnoë
Reposted by Alizée Malnoë
Liz Haswell
@ehaswell.bsky.social
· Jun 8
Reposted by Alizée Malnoë
Alizée Malnoë
@alizeemalnoe.bsky.social
· May 23
Alizée Malnoë
@alizeemalnoe.bsky.social
· May 23
Alizée Malnoë
@alizeemalnoe.bsky.social
· May 23
Alizée Malnoë
@alizeemalnoe.bsky.social
· May 23
Improving Performance, Accountability and Responsiveness in the Civil Service
The Office of Personnel Management (OPM) is proposing a rule to increase career employee accountability. Agency supervisors report great difficulty removing employees for poor performance or misconduc...
www.federalregister.gov
Alizée Malnoë
@alizeemalnoe.bsky.social
· May 16
Alizée Malnoë
@alizeemalnoe.bsky.social
· May 13
Reposted by Alizée Malnoë