Effects of Enhanced Temperature on Chlorophyll Content and Chlorophyll Fluorescence Parameters in Populus tomentosa Carr.

The effects of elevated temperature(+2℃ and +4℃) on chlorophyll content and chlorophyll fluorescence in Populus tomentosa Carr.were imitated in artificial climate room using the variety of Populus tomentosa Lumao50 as material.The results showed that,elevation of 2℃ and 4℃ significantly decreased chlorophyll a and chlorophyll a+b content,12.97%,13.66% and 11.91%,12.61%,respectively.However,it gave little effect on chlorophyll b and chlorophylla/b,6.84%,7.53% and 6.96%,6.60%,respectively.On the other hand,elevation of 2℃ and 4℃ showed little influence on Fv/Fm.In relation to the effects on Yield and qP,elevated 2℃ and 4℃ caused different results.Elevation of 2℃ little changed Yield and qP,while elevation of 4℃ signi-ficantly reduced the Yield and qP values(7.11% and 12.74%).Meanwhile,elevation of 2℃ and 4℃ significantly decreased qN value in the observed seedlings(6.47% and 7.09%).In conclusion,the elevated temperature showed significant inhibition on the chlorophyll a and total chlorophyll content,and also inhibited the procedure and efficiency of photosynthetic electron transport.