it is postulated that ( a ) the biochemical system involved in the induction of nr in the cortex and stele is relatively insensitive to the presence of no ( 3 ) ( - ) , ( b ) the receptor for the nr induction response and the nr protein are associated with cell plasmalemmae and little no ( 3 ) ( - ) is taken up by cells of the cortex and stele , and/or ( c ) no ( 3 ) ( - ) is compartmentalized during transport through the symplasm , which limits exposure for induction of nr and no ( 3 ) ( - ) reduction .
C0007634
cell
C0007603
plasmalemmae