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Plastid terminal oxidase ( PTOX ) has the potential to act as a safety valve for excess excitation energy in the alpine plant species R anunculus glacialis L .
Author(s) -
LAUREAU CONSTANCE,
DE PAEPE ROSINE,
LATOUCHE GWENDAL,
MORENOCHACÓN MARIA,
FINAZZI GIOVANNI,
KUNTZ MARCEL,
CORNIC GABRIEL,
STREB PETER
Publication year - 2013
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.12059
Subject(s) - photorespiration , plastoquinone , rubisco , photosynthesis , electron transport chain , botany , alternative oxidase , biology , photosystem ii , biophysics , horticulture , chemistry , biochemistry , chloroplast , respiration , thylakoid , gene
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.