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. 2019 Feb 20;42(5):1532–1544. doi: 10.1111/pce.13514

Table 2.

Correlation matrices by Spearman's rho correlation of leaf rolling and potentially associated traits under drought stress in (A, B) field and (C) greenhouse lysimeter experiments conducted on ~220 aus genotypes

(A) 2012DS field—early maturing group—measurements taken on 70 DAS
LRS NDVI ΔNDVI 64–70 DAS LWP θv 30 cm Leaf width Leaf length gs CT
NDVI −0.1
ΔNDVI 64–70 DAS −0.47* 0.26
LWP −0.1 0.25 0.02
θv 30 cm −0.17 0.13 0.2 0.13
Leaf width −0.52*** 0.19 0.23 0.46** 0.16
Leaf length 0.59*** 0.26 −0.27 −0.28 −0.14 −0.2
gs −0.3 0 0.16 0.08 −0.02 0.14 −0.31
CT −0.09 0.18 −0.14 0.71*** 0.07 0.5 −0.23 0.27
[ABA] −0.06 −0.28 0.11 0.03 −0.19 −0.07 −0.05 −0.12 −0.24
(B) 2012DS field—medium maturing group—measurements taken on 81 DAS
LRS NDVI ΔNDVI 74–81 DAS LWP θv 30 cm Leaf width Leaf length gs
NDVI −0.17
ΔNDVI 74–81 DAS −0.6*** 0.35***
LWP −0.26* 0.29 0.27
θv 30 cm −0.01 −0.01 0.01 −0.2
Leaf width −0.22 −0.02 −0.05 0.09 −0.12
Leaf length 0.33* −0.19 −0.05 −0.15 −0.18 0.04
gs −0.15 0.35*** 0.23 0.13 0.05 0.13 −0.25
CT −0.01 −0.21 −0.01 0.08 0.16 0.18 −0.05 0.12
(C) Greenhouse lysimeter study—108 DAP
LRS LWP Soil moisture Normalized Tr Absolute Tr Leaf width Leaf width ratio Leaf length Leaf length ratio Leaf area Leaf area ratio gs
LWP 0.04
Soil Moisture −0.44* 0.27
Normalized Tr −0.26 0.04 0.55***
Absolute Tr 0.13 0.04 −0.31 0.48*
Leaf width −0.4* −0.19 0.19 0.11 0.01
Leaf width ratio 0.3 0.03 −0.23 0 0.02 −0.47*
Leaf length −0.04 −0.27 −0.2 −0.31 −0.06 0.12 −0.41
Leaf length ratio 0.07 0.19 0.41 0.54*** −0.09 −0.13 0.27 −0.58
Leaf Area −0.28 −0.35 0.06 −0.06 −0.02 0.65*** −0.64*** 0.73*** −0.42*
Leaf area ratio 0.29 0.22 −0.09 0.09 −0.06 −0.31 0.8*** −0.65*** 0.64*** −0.69***
gs −0.23 −0.42 0.3 0.22 −0.3 −0.02 −0.06 0.07 0.22 0.06 −0.06
[ABA] 0.07 0.07 −0.33 −0.28 −0.13 −0.39 0.35 −0.17 −0.28 −0.32 0.09 0.05

Note. Absolute Tr: absolute weekly transpiration rate at 99 DAP; CT: canopy temperature; gs: stomatal conductance; LRS: leaf rolling score; LWP: leaf water potential; NDVI: normalized difference vegetation index; Normalized Tr: weekly transpiration rate at 99 DAP normalized to water uptake of the first week of stress; SM: soil moisture level relative to initial soil moisture at the start of the stress treatment; ratio: WW‐DS/WW; θv 30 cm: volumetric water content at 30 cm depth.

Significant correlations are indicated by

*

P < 0.05;

**

P < 0.01;

***

P < 0.001.