Fluorescence microtiter plate spectroscopy of intact leaf disks was done as previously described (Pasin et al., 2014 (link)). Fifty microliters of water were placed in each well of a Costar flat-bottom black opaque 96 well plate (Corning Inc., Corning, NY, USA) and spread to cover the bottom of the well. Single leaf disks taken with a size 3 cork borer (6 mm diameter) were placed with the adaxial side down on top of the water in the wells. Fluorescence detection was performed using a Synergy 2 reader with Gen5 version 1.10 software (BioTek Instruments Inc., Winooski, VT, USA) and the following read parameters: excitation 485/20, emission 516/50, optics position top 50%, and sensitivity 120.
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