
%0 Journal Article
%A Neales, TF 
%A Sale, PJM 
%A Meyer, CP 
%T Carbon Dioxide Assimilation by Pineapple Plants, <I>Ananas comosus</I> (L.) Merr. II. Effects of Variation of the Day/Night Temperature Regime
%J Functional Plant Biology
%D 1980/08/01
%V 7
%N 4
%P 375-385
%K 
%R https://doi.org/10.1071/PP9800375
%U https://www.publish.csiro.au/paper/PP9800375 
%X The effects of variation of day/night temperature regime on the diurnal patterns of CO2 assimilation of pineapple plants were examined using single leaf and field enclosure methods.    At day temperatures of 30&#176;C, increasing night temperatures from 20 to 35&#176;C reduced the total assimilation of CO2 per daily light/dark cycle from 6.5 to 1.3 g CO2 m-2 (leaf area) day-1, and also reduced the proportion of total CO2 assimilation that occurred at night from c. 90% to c. 40%.    Decreasing day temperatures (30 to 10&#176;C) had little effect on total daily CO2 assimilation in warm (25&#176;C) nights, but reduced it in cooler (15&#176;C) nights. At day temperatures of <152C, CO2 assimilation took place predominantly (60-100%) in the photoperiod. In cool (10&#176;C) days, the normal inverted stomatal rhythm of CAM plants was reversed; leaf conductance was high (c. 1.0 mm s-1) throughout the photoperiod and a large CO2 efflux was observed, lasting c. 2 h, at the beginning of the dark period.    Leaf conductance of pineapples, by day and by night, is strongly influenced by ambient temperatures, with cool conditions favouring stomatal opening. 
