Table 2.

Correlations between bud set traits in a Populus nigra full-sib family (POP5).

	(a)							(b)
	date2.5	date2	date1.5	date1	date0.5	subproc1	subproc2	date2.5	date2	date1.5	date1	date0.5	subproc1	subproc2
date2.5		0.97	0.89	0.81	0.62		-0.84		0.98	0.93	0.83	0.63		-0.24
		***	***	***	***		***		***	***	***	***		**
date2	0.99		0.96	0.89	0.61		-0.92	0.99		0.98	0.90	0.69		-0.20
	0.00		***	***	***		***	0.00		***	***	***		*
date1.5	0.93	0.97		0.97	0.63	0.24	-0.96	0.98	1.00		0.96	0.76	0.36	-0.12
	0.01	0.00		***	***	**	***	0.00	0.00		***	***	***	ns
date1	0.87	0.93	0.98		0.68	0.33		0.96	0.99	1.00		0.88	0.50
	0.02	0.01	0.00		***	***		0.01	0.00	0.00		***	***
date0.5	0.78	0.72	0.58	0.84		0.03		0.88	0.93	0.96	0.98		0.49
	0.03	0.04	0.05	0.02		ns		0.02	0.01	0.01	0.00		***
subproc1			-0.08	-0.17	0.11		-0.27			-0.31	-0.42	-0.59		0.28
			0.08	0.08	0.08		***			0.07	0.07	0.05		***
subproc2	-0.92	-0.98	-1.00			0.08		-0.56	-0.47	-0.37			0.74
	0.01	0.00	0.01			0.08		0.06	0.06	0.07			0.04

POP5 grown in two experimental sites in Italy: Cavallermaggiore (CV) and Viterbo (VT). Data were analyzed on cumulative night length (CNL) basis. (a) Within site phenotypic (above the diagonal) and genetic (below the diagonal, with ± standard deviation (SD)) correlations for CV and (b) likewise for VT. The levels of significance of the Pearson coefficient are indicated as: ns, non-significant; *, P ≤ 0.05; **, P ≤ 0.01; ***, P ≤ 0.001.