Table 3.

Correlation coefficients of the linear relationships between Δ¹³C of the different plant organs and Δ¹⁸O of shoots against WUEs for all the treatments and genotypes together

		WUEinstantaneous	WUEintrinsic	WUEbiomass
Low N	Δ13Csp	–0.406	–0.851**	–0.626*
	Δ13Cf	–0.378	–0.757**	–0.510
	Δ13Cs	–0.293	–0.778**	–0.491
	Δ13Cr	–0.123	–0.689*	–0.450
	Δ18Os	–0.278	–0.291	–0.145
High N	Δ13Csp	–0.736**	–0.708*	–0.958**
	Δ13Cf	–0.729**	–0.704*	–0.924**
	Δ13Cs	–0.734**	–0.746**	–0.928**
	Δ13Cr	–0.823**	–0.758**	–0.948**
	Δ18Os	0.124	0.273	0.131

Linear correlations were calculated within each N treatment using water and genotype means (n=12), *P <0.05, **P <0.01.