《Table 3 Chloroplast morphology and ultrastructure in 90-21-3 and D937 grown under control and potas

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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) L，length；W，width.Values are expressed as mean±SE with 25 replicates.Within a row，values followed by different letters are significantly different（P<0.05），determined by LSD.

Chloroplast morphology Normal chloroplast morphology and structure in mesophyll cells（MCs）are necessary for ensuring normal leaf photosynthesis of maize.In this study，chloroplast from both lines was irregular，and chloroplast number in MCs was reduced accordingly under K deficiency（Table 3）.Compared with controls，the number of chloroplasts in MCs was decreased by 8.91 and 20.61%in 90-21-3 and D937，respectively.In addition，edema was evident in some chloroplasts under K deficiency in 90-21-3and D937.The external surfaces of chloroplasts were transformed from long and oval to elliptical or almost circular.Accordingly，the values of length/width（L/W）of chloroplasts were significantly decreased by 15.42%in 90-21-3，and by32.64%in D937 under K deficiency due to the decreased length and increased width of chloroplasts.Compared with the controls，the length in D937 was significantly decreased by 13.41%and the width was significantly expanded by28.22%，while in 90-21-3 the values were significantly decreased by 4.2 and 13.4%，respectively.