loss of na ( + ) was strongest at ph 4 and was affected by anions , being greatest with so 4 ( 2- ) and following the sequence so 4 ( 2- ) > cl ( - ) > no 3 ( - ) . on the basis of the finding that initial acceleration of uptake as well as loss of na ( + ) depended on the ph of the medium we suggest that , in barley roots , aba stimulates an exchange of na ( + ) for h ( + ) at the plasmalemma of the cortical cells .
C0007603
plasmalemma
C0007634
cells