Fig. 1

Effects of low N condition on growth, photosynthesis and nitrogen content in a newly formed hexaploid (neo-6×), its diploid (2×) and tetraploid (4×) parents, and natural allohexaploid (nat-6×). 17-day-old seedlings were subjected to low N condition (0.1 mM) for 31 days. The values are means of four biological replicates. a Growth status of four wheat lines under 0.1 mM and 5 mM N conditions. b Photosynthesis and nitrogen content: g_s − stomatal conductance; P_N − net photosynthetic rate; Chl – chlorophyll; Car–carotenoid; E − transpiration rate. Asterisks indicated significant difference (t test, P < 0.05) between control and low N-stressed plants for a given genotype. The means of any two of all four lines at the same N condition were compared using t test (P < 0.05), and means followed by different letters at the same N condition are significant