A transient expression system was developed based on Agrobacterium-mediated transformation as previously described (Zhang et al., 2011 (link)). For fluorescence observations, the tobacco leaves were excised and mounted on slides in water. Green fluorescence (GFP: 488 nm), red fluorescence (mCherry: 561 nm), and yellow fluorescence (YFP: 514 nm) were observed under a Zeiss LSM750 confocal laser-scanning microscope (Carl Zeiss AG, Oberkochen, Germany).
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