Table IV. Multivariate linear regression equations of root architectural plasticity traits in each experiment related to the grain yield stability coefficient of each genotype.

TRL, Total root length; refer to Table I legend for other abbreviation definitions.

Population/Experiment	P	r2	Model (Yield Stability Coefficient)
Aus 276
Field physiology	0.0324	0.7456	1.15 − (1.23 × Plas RLD 0–15 cm) + (0.22 × Plas RLD 30–45 cm) + (0.35 × Plas RLD 45–60 cm)
Lowland lysimeter	0.0125	0.4629	0.6434 − (0.0169 × Plas TRL >60 cm LDS) − (0.0380 × Plas TRL >60 cm LRW) − (0.0513 × Plas RDW >60 cm LDS)
Upland lysimeter	0.0384	0.2904	0.3778 + (0.0597 × Plas TRL >60 cm UDS) − (0.5055 × Plas RDW 20–40 cm UDS)
Rhizoscope	0.1485	0.1015	0.2543 + (0.6108 × Plas diameter)
Kali Aus
Field physiologya	0.0864	0.9703	3.45 + (1.33 × Plas RLD 0–15 cm) − (4.82 × Plas RLD 15–30 cm) − (1.89 × Plas RLD 45–60 cm) + (6.23 × Plas %LR 15–30 cm) + (5.74 × Plas %LR 30–45 cm) + (4.10 × Plas %LR 45–60 cm)
Lowland lysimeterb	0.055	0.1896	1.29 − (0.34 × Plas RDW 20–40 cm LRW)
Upland lysimetera	0.0067	0.5907	1.50 − (0.16 Plas TRL >60 cm URW) + (0.53 × Plas %LR >60 cm URW) + (0.5 × Plas RDW 0–20 cm UDS) − (0.15 × Plas RDW 20–40 cm URW)
Rhizoscope	0.1764	0.0894	1.25 + (0.82 × Plas angle)

^aExcluding genotypes IR 92801-371-B and IR 92801-434-B with yield stability coefficients > 2.

^bExcluding parents Kali Aus and MTU1010.