Could anyone help me analyze the underlying mechanisms (biophysics, biochemistry or molecular biology etc. are all fine) that potassium may have to affect the chloroplast and thylakoid structure. Since under potassium deficiency conditions, chloroplasts are usually swollen with a poor constrast which grana stacks are difficult to distinguish (please find the attached files to see the different structure under full-nutrient and potassium deficient conditions). Many suggestions for further research are sincerely hoped.