Table IV. Correlation between grain yield and metabolite levels

Correlation coefficients are shown between grain yield and metabolite levels under each growth condition. Ten genotypes grown in two plots were analyzed (n = 20 for 1 year). Data from both years were analyzed for the WW and DS conditions, whereas only 2010 data were analyzed for the HS and DS+HS conditions.

MetaboliteWWDSHSDS+HS
Ala−0.05−0.080.17−0.52*
Asn0.27−0.36*0.36−0.55*
Asp0.29−0.300.33−0.63**
Benzoate0.040.11−0.44−0.66**
β-Ala0.43**−0.050.42−0.21
Erythritol0.250.060.58*0.07
Fru−0.06−0.03−0.160.17
Fumarate0.180.15−0.58*−0.43
Glycerol-3-phosphate−0.22−0.51**0.00−0.25
GABA−0.130.10−0.19−0.55*
Galactinol−0.10−0.32*−0.250.15
Glu0.09−0.160.21−0.60*
Glycerate−0.060.36−0.050.05
Glycerol0.140.380.67*0.17
Gly0.14−0.52***−0.35−0.59*
Homo-Ser0.26−0.250.31−0.56*
Ile−0.05−0.210.43−0.71**
Itaconate−0.14−0.40*−0.310.22
Malate−0.100.20−0.45−0.59*
Maltitol0.43**0.180.350.64**
Maltose0.100.290.250.44
Myoinositol−0.22−0.54***−0.21−0.51*
Nicotinate−0.27−0.47**0.51*−0.02
Octadecanoate−0.26−0.20−0.420.00
Phe−0.08−0.260.38−0.67**
Phosphate−0.02−0.37*0.56*−0.24
Pro0.03−0.100.42−0.44
Putrescine−0.030.150.36−0.05
Pyro-Glu0.24−0.40*−0.28−0.60*
Raffinose0.050.29−0.59*0.12
Ser0.10−0.37*0.26−0.49
Succinate−0.160.11−0.73***−0.13
Threonate0.14−0.47**−0.050.31
Thr0.180.120.52*−0.62**
Trehalose0.110.010.60**−0.34
Trp0.050.080.01−0.50*
Tyr0.060.140.38−0.52*
Urea0.020.170.00−0.30
Val−0.06−0.170.55*−0.69**
Xylitol0.160.100.56*0.23
Xyl0.020.280.320.06
  • * Correlation at P < 0.05.

  • ** Correlation at P < 0.01.

  • *** Correlation at P < 0.001.