leaf_fluorescence_fv_over_fm

Label: Leaf maximum quantum yield (Fv/Fm)
Entity URI: https://w3id.org/APD/traits/trait_0020417
Type: numeric
Definition: Maximum [NCIT:C25564] quantum yield [TO:0012004] of photosystem II [GO:0009539], as determined through chlorophyll fluorescence [GO:0090546]. Quantum yield is the ratio [PATO:0001470] of photons [NCIT:C88112] absorbed to photons emitted [SIO:000384] through fluorescence.;A trait that indicates the health of photosystem II in a dark adapted leaf. Quantum yield is calculated as the ratio of variable fluorescence (Fv) to maximum fluorescence (Fm), with a higher value indicating a healthier leaf. Variable fluorescence (Fv) is calculated as the difference in fluorescence between a leaf where all photsystems have been saturated by light (Fm) and a leaf in a dark-adapted state (minimum fluorescence; Fo).
Additional comments: None
units: {dimensionless}
allowable range: 0.2 - 1 {dimensionless}

See the AusTraits Plant Dictionary (https://w3id.org/APD/traits/trait_0020417) for additional information about this trait.

Coverage

For this trait, AusTraits includes a total of 2,330 records. This includes: