The expression of PIP1;1 decreased in the tolerant cultivar under
low N
In the sensitive cultivar, there was no significant difference in thePIP1;1 transcript abundance under both N-sufficient and
N-deficient conditions (Fig. 3). In ‘Topas’, contrary to the protein
abundance, N deficiency caused a two-fold reduction in the PIP1;1transcript level. The transcription of PIP1;3 was unaffected by N
deficiency in both cultivars.