2.5. Light and fluorescence microscopy
Cross and epidermal surface sections of green and senescent
yellow Sp. wallisii leaves were cut with a razor blade. Sections were
viewed at a Zeiss Axiovert 200 M microscope, equipped with a
Zeiss Axiocam MRc5 (Carl Zeiss AG, Jena, Germany). For fluorescence
images either filter set 01 (excitation BP 365/12 nm, emission
LP 397 nm) or filter set 09 (excitation BP 450–490 nm,
emission LP 515 nm) were used (see Fig. 4).