Comparative analysis of heterogeneity of primary photosyntheticprocesses within fruticose lichen thalli: Preliminary study ofinterspecific differences
2014
Two species of fruticose lichens from different habitats and of
distinct color, Usnea antarctica and Stereocaulon vesuvianum,
were compared using chlorophyll fluorescence imaging in order
to study the distribution of primary photosynthetic processes
within the thalli. The thallus of U. antarctica is yellow with
black tips: in this species chlorophyll containing cells were
mostly located in the middle region of the thallus and the
highest PS II efficiency was detected in the middle to basal
region, as shown by the FV/FM and PhiPSII values. No
chlorophyll fluorescence was detected in the apical part of the
thallus, indicating that little or no photosynthesis takes
place in these tissues. The lichen S. vesuvianum is
homogeneously pale grayish green and chlorophyll containing
cells are distributed along the thallus with maximum
concentration in the middle region. In S. vesuvianum, the
highest PS II efficiency was detected in the apical to middle
region of the thallus, while the basal portion was found to
have the lowest efficiency of primary photochemical reactions.
Quenching analysis data confirmed the uneven patterns of
primary photosynthetic processes within the thalli of these
fruticose lichens.
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