Cyclic electron flow and light partitioning between the two photosystems in leaves of plants with different functional types.

ABSTRACT: Cyclic electron flow (CEF) around photosystem I (PSI) is essential for generating additional ATP and enhancing efficient photosynthesis. Accurate estimation of CEF requires knowledge of the fractions of absorbed light by PSI (f_I) and PSII (f_II), which are only known for a few model species such as spinach. No measures of f_I are available for C₄ grasses under different irradiances. We developed a new method to estimate (1) f_II in vivo by concurrently measuring linear electron flux through both photosystems [Formula: see text] in leaf using membrane inlet mass spectrometry (MIMS) and total electron flux through PSII (ETR2) using chlorophyll fluorescence by a Dual-PAM at low light and (2) CEF as ETR1-[Formula: see text]. For a C₃

SUBMITTER: Sagun JV 

PROVIDER: S-EPMC6874625 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature