Saturating pulses were applied to obtain the maximum fluorescence yield (Fm).
the maximum fluorescence yield reached maximal value of fluorescence intensity (F M ) under saturating illumination.
The results demonstrated that water deficit stress decreased maximum Chl fluorescence (Fm), variable Chl fluorescence (Fv), the photochemical efficiency of PSII (Fv/Fm), Chl (a, b and a + b), leaf area index (LAI), biological yield and seed yield but minimum fluorescence (F0), carotenoids, Anthocyanin and trigonelline concentration increased under water deficit stress.
The O point of the fluorescence induction curve is a minimum value (designated as constant fluorescence yield Fo at 50 µs) when plastoquinone (PQ) electron acceptors (QA and QB) of the PSII complex are fully oxidized.
In a fully relaxed, dark-acclimated state, the minimum and maximum fluorescence yields are termed Fo and Fm respectively.
The adg1-1/tpt-2 doublexhibitedexhibited a slow decline in the fluorescence yield in the presence of FR until a new minimum level was attained, whereas Fo in the wild type remained unaffected by FR.
Al decreased maximum quantum yield of primary photochemistry and total performance index, but increased minimum fluorescence, K-band, relative variable fluorescence at J- and I-steps.
The results demonstrated that the highest light intensity and the severe water stress decreased maximum fluorescence (Fm), variable fluorescence (Fv /Fm, quantum yield of PSII photochemistry (ФPSII), Chl and photochemical quenching (qP) but increased non-photochemical quenching (NPQ), minimum fluorescence (F0) and Anthocyanin (Anth).
the current fluorescence yield.
total fluorescence yield.
