Table 6.

Pearson's correlation between δ⁶⁶Zn and some photosynthetic performance parameters

δ66Zn	gs	Fv′/Fm′	ΦCO2	qN	NPQ
r	0.921*	0.921*	0.883*	–0.944*	–0.974**
Significance (bilateral)	0.027	0.026	0.047	0.016	0.005
n	5	5	5	5	5

The δ⁶⁶Zn was measured in high leaves. The correlation coefficient (r) is indicated as significant at P <0.05 (*) or P <0.01 (**).

F_v′/F_m′, relative quantum yield; g_s. stomatal conductance to water; qN and NPQ, non-photochemical quenching; ΦCO₂, the quantum yield of CO₂ fixation.