Table 2.

Fold changes of detected metabolites in leaves of the three barley genotypes under LK stress

Metabolite name	Log2(LK/C)a			Metabolite name	Log2(LK/C)a
	XZ153	XZ141	LuDaoMai		XZ153	XZ141	LuDaoMai
Amino acid b				Sugars and polyols
L-Alanine	0.01	0.51**	0.24**	Sucrose	0.06	0.13**	0.01
Valine	1.17**	1.39**	1.27**	Inositol	0.76**	0.30**	1.28**
L-Leucine	1.23**	1.84**	1.06**	Organic acid
L-Isoleucine	1.01**	1.17**	1.65**	Glycolic acid	1.88**	1.29**	1.67**
L-Proline	0.78**	0.61**	0.71*	Benzoic acid	2.35**	1.59**	1.82**
Glycine	2.30**	3.41**	3.36**	Maleic acid	3.43**	2.79**	2.92**
L-Serine	1.00**	0.83**	0.80**	Succinic acid	−1.40**	−1.26**	−1.28**
L-Threonine	0.79**	0.81**	0.78**	Glyceric acid	−0.20*	−0.04	1.42**
β-Alanine	−0.96**	−0.52**	0.14	Fumaric acid	−0.35**	−0.50**	0.27**
L-Aspartic acid	−1.61**	−2.40**	−1.79**	Malic acid	−2.12**	−2.40**	−1.41**
GABA	0.13*	0.33**	0.05	Ketoglutaric acid	−3.59**	−4.73**	−2.51**
L-Glutamic acid	−1.69**	−2.25**	−1.21**	Threonic acid	−1.47**	− 1.09**	−1.83**
L-Phenylalanine	1.90**	1.38**	1.51**	Ribotide	−0.02	−0.95**	−0.03
L-Lysine	2.52**	1.82**	1.91**	Shikimic acid	−0.56**	−0.30*	0.92**
Tyrosine	2.30**	1.80**	2.15**	Citric acid	−4.77**	−4.99**	−3.58**
L-Asparagine	5.43**	3.98**	2.32**	Quinic acid	−0.17**	−0.30*	0.35**
L-Glutamine	3.78**	2.66**	2.43**	Ascorbic acid	0.12	−0.35*	0.69**
Sugars and polyols				Hexadecanoic acid	1.19**	1.38**	0.15*
Xylose	0.71**	1.05**	1.34**	Hexanoic acid	0.26	0.50**	−0.70**
L-Arabinose	1.85**	1.54**	1.74**	others
Ribose	0.87**	2.14**	1.36**	Putrescine	5.30**	5.14**	4.54**
Xylitol	0.58**	0.59**	0.27*	Uracil	3.08**	1.35**	2.62**
2-Keto-L-gluconic acid	0.25*	0.27**	0.18*	Pipecolinic acid	3.83**	2.61**	0.71**
Fructose	2.83**	3.07**	3.43**	Threonic acid-1,4-Lactones	0.1	0.63**	1.02**
Galactose	3.75**	2.65**	2.81**	O-Acetyl-L-Serine	1.31**	0.55**	2.03**
Glucose	4.63**	3.57**	3.87**	Pyroglutamic acid	0.68**	−0.32**	−0.03
Sorbose	2.64**	2.63**	2.86**	O-Methyl-Inositol	0.91**	−0.04	0.12
Maltose	−0.50**	−0.52**	− 0.11	–	–	–	–

^aThe fold changes were calculated using the formula log₂ (LK/C), LK Low potassium, C control. ^bThe bolder parts of the table are the different categories of metabolites.* and ** indicate significant (p < 0.05) and highly significant difference (p < 0.01), respectively