. 2018 Sep 5;6:e5445. doi: 10.7717/peerj.5445

Table 3. Organic acids identified on sugarcane methanolic leaves extracts by GC-MS TOF.

The treatments were inoculation with G. diazotrophicus and H. seropedicae (PGPB), bacteria and humic acid (PGPB+HA) or only humic acid (HA) isolated from vermicompost. The data were expressed in respect to the control treatment (%).

Metabolite	HA	PGPB	PGPB+HA
2,3-dihydroxybutanoic acid	30^ns	31^ns	66^ns
2,5-furandicarboxylic acid	8^ns	19^ns	85^ns
2-deoxyribonic acid	−11^ns	−11^ns	28^ns
2-deoxytetronic acid	95^ns	95^ns	100^ns
2-hydroxyadipic acid	68^ns	7^ns	185^ns
2-hydroxyglutaric acid	262^ns	77^ns	57^ns
2-ketoadipic acid	−37^ns	8^ns	−36^ns
2-oxogluconic acid	65^ns	264^ns	730^**
3-hydroxy-3-methylglutaric acid	−23^ns	-4^ns	5^ns
3-hydroxypropionic acid	27^ns	31^ns	87^**
4-hydroxybutyric acid	27^ns	25^ns	50^ns
5-hydroxymethyl-2-furoic acid	−12^ns	−3^ns	33^ns
adipic acid	8^ns	8^ns	26^ns
alpha ketoglutaric acid	7^*	22^*	83^**
aminomalonic acid	36^ns	116^ns	83^ns
ascorbic acid	114^ns	155^ns	368^**
citramalic acid	−8^ns	−27^ns	−49^ns
citric acid	98^**	416^**	748^**
dihydroxymalonic acid	−72^ns	0^ns	298^**
fumaric acid	2^ns	−47^ns	126^**
galactonic acid	−39^ns	34^ns	37^ns
gluconic acid	4^ns	34^ns	77^ns
gluconic acid lactone	105^ns	330^**	412^**
glutaric acid	12^ns	179^ns	184^ns
glycolic acid	−16^ns	1^ns	19^ns
hexuronic acid	−9^ns	85^ns	305^*
idonic acid	150^*	150^*	268^**
isocitric lactone	145^**	10^ns	140^**
isothreonic acid	30^ns	103^**	211^**
itaconic acid	−50^**	31^**	28^**
lactic acid	76^**	22^**	43^**
maleic acid	305^**	263^**	122^**
mannonic acid	27^ns	160^ns	173^ns
methylmaleic acid	−11^ns	44^ns	60^ns
mucic acid	−47^**	127^**	408^**
oxalic acid	745^**	18^**	259^**
pantothenic acid	11^ns	81^**	307^**
propane-1,2,3-tricarboxylate /carballylic acid	80^ns	55^ns	174^ns
pyruvic acid	−61^**	0^ns	29^**
ribonic acid	33^*	46^**	155^**
saccharic acid	133^**	−13^ns	235^**
salicylic acid	−26^ns	44^ns	72^*
succinate semialdehyde/4-oxobutanoic acid	−4^ns	31^ns	48^ns
succinic acid	−23^*	−27^**	−15^ns

Notes.

ns: no significant

p < 0.05.

^**

p < 0.01.