
TY  - JOUR
A1  - Forseth, IN 
A1  - Ehleringer, JR 
T1  - Ecophysiology of Two Solar-Tracking Desert Winter Annuals. I. Photosynthetic Acclimation to Growth Temperature
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 1982
VL  - 9
IS  - 3
SP  - 321
EP  - 332
KW  - 
UR  - https://doi.org/10.1071/PP9820321 
N2  - The ability of two solar-tracking desert winter annuals, Lupinus arizonicus Watson and Malvastrum rotundifolium Gray, to acclimate their photosynthetic characteristics to different growth temperatures was examined. Plants were grown in growth chambers under 25/15&#176;C and 40/30&#176;C thermal regimes. The plants grown at 40/30&#176;C were also subjected to a drying cycle in order to assess whether or not drought affected the photosynthetic acclimation to high temperatures. Both species exhibited shifts in their temperature optima and thermal death points for photosynthesis. The droughted plants showed no further acclimation than did the watered plants grown at 40/30&#176;C. Using representative meteorological conditions measured in Death Valley, California, it was predicted that photosynthetic acclimation plays only a small role in enhancing daily carbon-gaining ability for late-season conditions. However, under conditions of drought stress and high temperatures, the acclimation may prevent thermal death and extend plant life. 
ER  -

