Table 4 Correlation analysis of yield and different physiological traits under two different N supplies.

	LAi	SLA	Roots	Leaves	Shoot: root	Chl a	Chl b	Chl a/b
HN	0.8	−0.3	−0.22	0.73	0.38	0.49	0.43	0.36
LN	0.72	−0.6	0.71	0.74	0.014	0.68	0.7	−0.63
	Pn	gs	WUEi	Amax	Jmax	Jmax: VCmax	TPU	CCpoint
HN	0.84	0.33	0.64	0.38	0.65	0.44	0.52	0.16
LN	0.94	0.89	0.15	0.74	0.84	0.72	0.91	−0.33
	Protein	NH4+	Proline	Betacyanin	*CqNR*	*CqGS2*	*CqASS1*	*CqAMT1*.1
HN	0.73	−0.64	−0.51	−0.73	−0.56	−0.63	−0.38	−0.32
LN	0.9	−0.92	−0.76	−0.56	−0.45	−0.74	−0.41	−0.62
	Seed weight	N° of seeds m ⁻²	% N seeds	Total free amino acids
HN	0.69	−0.72	0.69	0.67
LN	0.31	−0.4	0.21	0.45

The parameters analyzed under two different N supplies (HN (high nitrogen) and LN (low nitrogen)) included: individual leaf area [LAi], specific leaf area [SLA]), biomass dry weight (leaves, root, and shoot:root ratio), pigments (including chlorophyll a [Chl a], chlorophyll b [Chl b] and Chl a/b), photosynthetic parameters (including Pn [net photosynthesis], stomatal conductance [gs], intrinsic water use efficiency [WUEi]), maximum photosynthesis rate [A], maximum rate of carboxylation [V_Cmax], maximum rate of electron transport [Jmax], Jmax:V_Cmax ratio, use of trioses [TPU]) protein, \({{\rm{NH}}}_{4}^{+}\) and proline contents, enzyme activities (NR and GS), relative gene expression of CqAMT1.1 and yield and seed-related parameters (including harvest index [HI], seed weight, number of seed per area, N and protein contents and total free amino acids). Pearson correlation coefficient (PCC) was calculated; bold numbers denote significant correlation at a P < 0.05 and underlined numbers significant correlation at P < 0.001 (n = 12).

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