Plastid terminal oxidase ( PTOX) has the potential to act as a safety valve for excess excitation energy in the alpine plant species Ranunculus glacialis L.

• Published in: Plant, Cell & Environment
• Main Authors: LAUREAU, CONSTANCE, DE PAEPE, ROSINE, LATOUCHE, GWENDAL, MORENO‐CHACÓN, MARIA, FINAZZI, GIOVANNI, KUNTZ, MARCEL, CORNIC, GABRIEL, STREB, PETER
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2013
• Subjects: Ranunculus glacialis
• Online Access: http://dx.doi.org/10.1111/pce.12059; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fpce.12059; https://onlinelibrary.wiley.com/doi/pdf/10.1111/pce.12059

The capacity to consume excess photosynthetic electrons by PTOX activity was investigated in R. glacialis shade‐ and sun‐leaves. PTOX protein content was highest in sun‐leaves and correlated to electron consumption attributed to PTOX. In R. glacialis leaves, PTOX may act as safety valve to prevent overreduction of the electron transport chain and photoinhibition under conditions of varying light and temperature in the alpine environment.