%0 Journal Article
%T Photosynthetic Response to the Low Temperature in Elephant Grass (Pennisetum purpureum) and Zea mays
%A Abdulkhaliq A. AL-Shoaibi
%J International Journal of Botany
%D 2008
%I 
%X Photosynthetic CO2 uptake and the quantum efficiency of PSII photochemistry (Fv/Fm) of C4 grasses (Pennisetum purpureum and Zea mays) were studied at 14 and 25 ¡ãC. P. purpureum showed superior photosynthetic rates at chilling temperature (14 ¡ãC) than Z. mays. Growth at a chilling temperature compared to 25 ¡ãC had no significant effect on the light saturated assimilation rate (Asat), the quantum yield (¦Õ), the CO2 saturated rate of CO2 uptake (Amax) and the carboxylation efficiency of P. purpureum but caused more than 78% loss of those occurred in Z. mays. The values of Fv/Fm were significantly reduced only in Z. mays at 14 ¡ãC compared to 25 ¡ãC and as a result, the photosynthetic apparatus of P. purpureum was more resistant to chilling temperature than of Z. mays.
%K Zea mays
%K Pennisetum purpureum
%K chilling stress
%K gas exchange
%K Fv/Fm
%U http://docsdrive.com/pdfs/ansinet/ijb/2008/309-314.pdf