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Changes in apoplastic and cytoplasmic pH fluctuations, following application of NH4NO3, NH4Cl or KNO3. (A) Apolplastic pH (pHex) following treatments with either NH4NO3, NH4Cl or KNO3. Note the increase pH fluctuations induced by either NH4NO3 and NH4Cl but not by KNO3. (B) Cytoplasmic pH (pHcyt) following treatments as above. Note the changes in pH fluctuations induced by NH4NO3 and the subtler effects of NH4Cl.
