Fig. 1.

The effect of desiccation for 15 and 30 d followed by rehydration on photosynthesis in Peltigera polydactylon pretreated with partial dehydration (A and B) or 100 μM ABA (C and D), and the effects of these two pretreatments on respiration (E and F). a, After collection from the field; b, following 3-d pretreatment or maintenance moistened with distilled water (‘control’). Time 0 indicates the start of rehydration. In A and C the effects of pretreatment were significant (P < 0·001 and 0·002, respectively), and in the other graphs the effects of pretreatments were not significant. Open circles, control material; closed circles, material pretreated by partial dehydration; closed triangles, ABA-pretreated material; error bars denote the standard deviation, n = 5.