The roles of radiative, structural and physiological information of sun-induced chlorophyll fluorescence in predicting gross primary production of a corn crop at various temporal scales

•SIF's radiative component dominated SIF-GPP relationship at high temporal resolution.•The control shifted from radiation to structure over diurnal to seasonal scales.•SIF's physiological information weakened the SIF-GPP relationship.•The SIF-GPP linearity varied with temporal scales, with higher at lower resolutions.•The temporal-scale dependency cannot be solely attributed to observational noise.