Effects of Low Temperature and Recoery on Photosynthetic Characteristics of Maize
Used maize inbred lines Ye478, He344, Kat853 as the materials at different low temperature stress than returned to normal temperature conditions, and compare photosynthesis and chlorophyll fluorescence parame-ters of seedlings. The results indicated that as the temperature dropped and low temperature stress time extended, seedlings initial fluorescence Fo of three maize inbred lines is rising, while the Fv/Fo and Fv/Fm were decreased. Fluo-rescence parameters changed greatly as the temperature decreasing, and the change range Ye478 < close344 <Kat853 at same temperature. The leaf initial fluorescence Fo decreased when the low temperature returns to normal, Fv/Fm and Fv/Fo showed an upward trend overall. Ye478 had the strongest cold resistance, it had been restored to nor-mal levels when recovery 1-2 d; while the PSⅡof Kat853 was heavy damaged, it did not reached normal levels when recovery 3 d, so it has a weak cold resistance.
MaizeLow temperature stressChlorophyll fluorescence parameterNet photosynthetic rate
NETL
NSTL
万方数据
维普
