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Ecophysiological Response of Manglietia aromatica to Short-term Low Temperature Treatment

LI Ming1,LI Fuxiu2,MA Huancheng2,LI Wei1,WANG Linzhong3 (1.The Laboratory of Aquatic Plant Biology Wuhan Botanical Garden Chinese Academy of Sciences Wuhan Hubei 430074;2.Southwest Forestry College Kunming Yunan 650224;3.Mianyang Normal College Mianyang Sichuan 621000)  
The variation of the physiological indices at low temperature of the Manglietia aromatica leaves have been measured in this experiment.The results indicate that the concentration of the free Proline.the malondialdelyole(MDA),soluble sugar and the relative electrical conductivity in leaves increased with the extended time of treatment.Among the chlorophyll fluorescence Parameters(Fv/Fm)and the variable fluorescence/initial fluorescence ratio(Fv/Fo)decreased,which could be explained by the influence of the low temperature on photosystem II(PSII).In leaves of Manglietia aromatica,the maximum quantum efficiency of PSII primary photochemistry(Fv/Fm)was significantly affected after 4h exposure to the low temperature of 2 ℃.The results could be used as the criterion for evaluation of the mechanism of winter resistance of Manglietia aromatica.
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