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Eureka lemon  (Cirrus limon  L. `Eureka') trees were grown in factorial combinations of low (L) or high (H) temperature [day/night temperature regimens of 29.4C/21.1C or 40.5C/32.2C] and ambient (C 380 ) or enriched (C 680 ) atmospheric CO 2  concentrations [380 umol mol -1  or 680 umol mol -1 , respectively]. After growth under these conditions for 5 months, morning and afternoon leaf carbon assimilation measurements were made with a temperature-controlled cuvette attached to a portable photosynthesis system. Net (P 3 ) and gross (P g ) photosynthesis were measured at 30 umol mol -1  intervals as leaves were exposed to cuvette CO 2  drawndowns from 700 to 300 umol mol -1  at 21% and 1% O 2 , respectively. Photorespiration (R p ) was estimated as the difference between P g  and P n . Generally, R p  increased as cuvette CO 2  decreased. Morning and afternoon R p  of leaves adapted to LC 380  conditions were similar. Morning R p  was higher than afternoon R p  for leaves adapted to LC 680  conditions. Morning R p  was higher for leaves adapted to HC 380  conditions as compared to HC 680 -adapted leaves. In contrast, afternoon R p  was higher for leaves adapted to HC 680  conditions than for H&amp;,-adapted leaves.

554 PB 365 PHOTORESPIRATION OF LEMON TREES IN RESPONSE TO TEMPERATURE AND ATMOSPHERIC CO, CONCENTRATION