Lange, OL/ Green, TGA/ Reichenberger, H 1999: The response of lichen photosynthesis to external CO2 concentration and its interaction with thallus water-status. - Journal of Plant Physiology154: 157-166. [RLL List # 175 / Rec.# 11020] Keywords: CO2 CONCENTRATING MECHANISM/ DIFFUSION RESISTANCE/ PHOTOSYNTHESIS/ WATER CONTENT/ WATER RELATIONS
Abstract: 4 fig. 1 tab. [Three species exhibiting different responses in net photosynthesis (NP) to high water content (WC) were compared: Diploschistes muscorum, with no depression in NP, D. scruposus, with a slight depression in NP, and Fulgensia fulgens, with a severe depression in NP. "The major differences in NP at high WC and ambient CO2 concentration were due not just to how high these additional resistances were. There was a major contrast between the three species in how they managed the interaction between CO2 diffusion pathways and water storage at high WC. Since underlying carboxylation processes were nearly identical our studies confirmed that the difference in NP performances at high WC must have a morphological basis and be a product of the symbiosis rather than just of the photobiont."]