Genetic control of functional traits related to photosynthesis and water use efficiency in Pinus pinaster Ait. drought response: integration of genome annotation, allele association and QTL detection for candidate gene identification

Table 2 Pearson correlation coefficients and statistical significance for measured traits in the F ₁ full sib family Gal1056xOria6 (n = 103)

Time-point	Trait	g_sw	WUE_i	δ¹³C	SLA	F_v’F_m’	Φ_PSII
1	A_n	0.42**	0.36**	n.s	0.23*	0.47**	0.54**
	g_sw		-0.61**	-0.51**	0.37**	0.24*	n.s
	WUE_i			0.49**	n.s	n.s	0.37**
	δ¹³C				0.34**	n.s	0.31**
	SLA					0.21*	n.s
	F_v’F_m’						0.31**
2	A_n	0.52**	n.s	-	n.s	0.62**	0.58**
	g_sw		-0.8**	-	0.29**	0.5**	0.2*
	WUE_i			-	0.21*	0.24*	n.s
	SLA			-		0.22*	n.s
	F_v’F_m’			-			0.39**
3	A_n	0.57**	n.s	-	n.s	0.82**	0.77**
	g_sw		-0.65**	-	n.s	0.49**	0.27**
	WUE_i			-	n.s	n.s	n.s
	SLA			-		n.s	n.s
	F_v’F_m’			-			0.73**

A_{n =} net photosynthetic rate (μmol CO₂m^-2 s^-1); g_sw = stomatal conductance to water vapour (molH₂Om^-2 s^-1); WUE_i = intrinsic water use efficiency (μmol CO₂ molH₂O^-1); δ¹³C = isotopic composition of ¹³C (‰); SLA = specific leaf area (m²Kg^-1); F_v’F_m’ = maximum efficiency of PSII under light conditions; Φ_PSII = quantum yield. Time-points of measurements correspond with: 1, well watered plants; 2, seven days without irrigation; 3, fourteen days without irrigation. *p < 0.05, **p < 0.01,***p < 0.001.

ISSN: 1471-2164