Link, SO/ Nash, TH", III 1984: The influence of water on CO2 exchange in the lichen Parmelia praesignis Nyl. - Oecologia64: 204-210. [RLL List # 124-72 / Rec.# 11542] Keywords: PARMELIA/ FLAVOPUNCTELIA/ ARIZONA/ PHOTOSYNTHESIS/ WATER RELATIONS/ LIGHT EFFECTS/ CO2 EXCHANGE
Abstract: 2 figures. 1 table. [Net photosynthetic rates for Arizonan specimens " ... were obtained as a function of 5 light levels, 5 temperature levels, and of water content as thalli dried from saturated conditions. The greatest maximal net photosynthetic rate occurred at higher temperatures as the light intensity increased. In the light, maximal water efficiency and sensitivity to changes in water content were generally maximal at tempertures yielding the greatest maximal net photosynthetic rates."]