《Table 4 Gas exchange parameters in 90-21-3, D937, 099, and 835 grown under control and potassium de

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《"Effects of potassium deficiency on photosynthesis,chloroplast ultrastructure,ROS,and antioxidant activities in maize(Zea mays L.)"》

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1) Tr，transpiration rate；Pn，photosynthetic rate；Gs，stomatal conductance；Ci，intercellular CO2 concentration.Values are expressed as mean±SE with five replicates.Within a row，values followed by different letters are significantly different（P<0.05），d

Under K deficiency，Chl a，Chl（a+b），and Chl a/b in 90-21-3and 099 were slightly different than controls，whereas these values in D937 and 835 were significantly decreased at tasseling and flowering stages compared to controls（Table 1）.Chl a and Chl（a+b）of D937 were significantly decreased by 13.99 and 9.03%in comparison to the control，17.92 and 14.65%，respectively，in 835.Moreover，Chla/b was significantly decreased by 8.85 and 16.31%respectively due to the decreased Chl a in D937 and 835.Chl b was stable under K deficiency stress.Chlorophyll parameters of 90-21-3 and 099 were all significantly higher than those in D937 and 835 under K deficiency treatment.