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. 2019 Apr 5;180(2):793–812. doi: 10.1104/pp.19.00238

Table 4. Linear regression of the relationship of the δ13C, δ18O, δ2H isotope compositions and GY, gs, and total N concentration.

Linear regression of the relationship of the δ13C, δ18O, and δ2H isotope compositions in the WSF and DM of the flag leaves, ears, and mature kernels (grains) with the GY, gs, and total N concentration of the flag leaves (N-Flag) and ears (N-Ear)Nine genotypes and three replicates per genotype were considered, accounting for a total of 54 values under RF (water stress) conditions, including fertilized and nonfertilized conditions and under fertilized conditions (HN), including the two water conditions. For the δ18O and δ2H of DM (flag leaves, ears, and roots), only two cultivars and two landraces were considered (24 plots). Analyses were performed on samples from the 2010 crop season. Level of significance: not significant, ns, P > 0.05; ***, P < 0.001; **, P < 0.01; *, P < 0.05.

Isotope/Organ/
Fraction gs GY N-Flag N-Ear
SI RF HN LN SI RF HN LN SI RF HN LN SI RF HN LN
Hydrogen
δ2Hroots DM 0.2ns 0.2ns 0.4ns 0.4ns −0.2ns −0.1ns 0.2ns 0.4ns −0.1ns −0.1ns 0.5* −0.1ns −0.2ns −0.2ns 0.5* −0.1ns
δ2Hstem water −0.3* 0.4** −0.1ns 0.1ns −0.3ns −0.1ns −0.2ns 0.1ns −0.1* 0.3* −0.2ns −0.1ns 0.2ns 0.1ns 0.3* −0.0ns
δ2Hflag DM −0.2ns −0.7*** −0.8*** −0.3ns 0.1ns −0.5* −0.6** −0.3ns 0.3ns 0.5* −0.6** 0.0ns 0.3ns 0.7*** −0.1ns 0.1ns
δ2Hflag WSF −0.2* −0.6** −0.4** −0.1ns −0.1ns −0.3* −0.4** −0.1ns −0.1* 0.6** −0.4** 0.2ns 0.1ns 0.7*** 0.2ns 0.2ns
δ2Hear DM −0.2ns −0.4** −0.8*** −0.4ns 0.3ns −0.4* −0.6** −0.4ns 0.5ns 0.4** −0.3ns 0.4ns 0.5* 0.9*** 0.2ns 0.5*
δ2Hear WSF 0.2ns −0.6*** −0.4** −0.3* 0.4** −0.5*** −0.3* −0.3* 0.4ns 0.7*** −0.1ns 0.1ns 0.3* 0.5*** 0.1ns 0.1ns
δ2Hgrain 0.1ns −0.6*** −0.5*** −0.5*** 0.3* −0.4** −0.5*** −0.5*** 0.7ns 0.4** −0.5*** 0.1ns 0.6*** 0.4** −0.2ns −0.0ns
Oxygen
δ18Oroots DM 0.1ns −0.1ns 0.1ns 0.3ns 0.1ns −0.2ns 0.1ns 0.3ns 0.5ns −0.1ns −0.1ns −0.0ns −0.3ns 0.1ns −0.1ns −0.0ns
δ18Oxylem water 0.3* 0.3* 0.3* −0.0ns 0.3ns −0.2ns −0.3* 0.1ns −0.2* −0.3* −0.2ns −0.1ns 0.2ns 0.2ns 0.4** 0.1ns
δ18Oflag DM 0.1ns −0.2ns −0.4** −0.3ns 0.1ns −0.2ns −0.3* −0.3ns −0.2ns 0.0ns −0.5*** −0.1ns −0.1ns 0.2ns −0.2ns 0.2ns
δ18Oflag WSF −0.3* 0.0ns −0.8*** −0.2ns −0.2ns −0.5** −0.6*** −0.2ns −0.7* −0.3ns −0.5*** −0.1ns −0.6*** −0.2ns −0.3* 0.1ns
δ18Oear DM −0.1ns 0.2ns −0.2ns 0.1ns 0.1ns −0.3ns −0.1ns 0.1ns −0.1ns −0.1ns 0.1ns −0.2ns −0.0ns −0.0ns −0.0ns −0.1ns
δ18Oear WSF −0.1ns 0.2ns −0.3* −0.3* 0.1ns −0.4** −0.1ns −0.3* −0.1ns −0.2ns −0.1ns −0.1ns −0.2ns −0.1ns −0.1ns −0.1ns
δ18Ograin 0.1ns 0.1ns −0.0ns −0.0ns −0.2ns −0.2ns −0.2ns 0.1ns −0.2ns −0.2ns −0.1ns 0.1ns −0.3* −0.2ns −0.1ns −0.2ns
Carbon
δ13Cflag DM −0.2ns −0.7*** −0.7*** −0.59*** 0.1ns −0.3* −0.6*** −0.6*** 0.4s 0.3* −0.6*** 0.1ns 0. 5*** 0.4** −0.1ns 0.1ns
δ13Cflag WSF −0.4** −0.4** −0.8*** −0.6*** −0.3ns −0.3* −0.6*** −0.6*** −0.5** 0.1ns −0.6*** −0.1ns −0.4** 0.2ns −0.1ns 0.1ns
δ13Cear DM −0.1ns −0.5*** −0. 7*** −0.5*** 0.4** −0.4** −0.4** −0.5*** 0.5ns 0.4** −0.3* 0.1ns 0.5*** 0.4** −0.1ns 0.2ns
δ13Cear WSF −0.1ns −0.3* −0.6*** −0.42** 0.4** −0.5*** −0.4** −0.4** 0.4ns 0.3* −0.2ns 0.1ns 0.2ns 0.3* −0.1ns 0.2ns
δ13Cgrain −0. 4** −0.7*** −0.8*** −0.29* −0.3* −0.3* −0.8*** −0.3* 0.21** 0.47*** −0.57*** 0.3* 0.16ns 0.4** −0.3* 0.3ns