. 2021 Nov 8;10(11):1149. doi: 10.3390/biology10111149

Table 2.

Quantification of PGP substances or activity of Enterobacter sp./L. adecarboxylata PAB19 grown with 2–15% PEG-6000 stress.

Treatment	Dose Rate (%)	IAA Production (µg mL⁻¹)	ACC Deaminase (μmol α-KB/mg Protein/h)	P-Solubilization (µg mL⁻¹)	Production of Siderophore Production
Treatment	Dose Rate (%)	IAA Production (µg mL⁻¹)	ACC Deaminase (μmol α-KB/mg Protein/h)	P-Solubilization (µg mL⁻¹)	HCN	NH₃	FeCl₃ Test	SA (µg mL⁻¹)	2,3 DHBA (µg mL⁻¹)
Drought (PEG-6000)	0	136.3 ^d ± 6.8	29.3 ^d ± 2.5	68.3 ^e ± 3.5	−	+++	++	24.2 ^e ± 1.4	34.1 ^d ± 0.5
	2	139 ^d ± 10.3	31.0 ^d ± 7.0	74.6 ^d ± 3.0	−	++	++	27.3 ^d ± 2.1	36.0 ^c ± 1.1
	5	157.6 ^c ± 8.5	37.0 ^c ± 2.0	81.6 ^c± 3.2	−	++	++	31.5 ^c ± 2.5	38.5 ^b ± 1.7
	10	169.6 ^b ± 5.5	44.0 ^b ± 2.0	91.6 ^b ± 3.5	−	++	++	37.0 ^b ± 2.8	40.0 ^b ± 1.8
	15	176.2 ^a ± 5.6	56.6 ^a ± 5.0	98.3 ^a ± 3.5	−	+	++	42.5 ^a ± 3.0	44.3 ^a ± 2.3

IAA = indole-3-acetic acid; α-KB = α-keto butyrate; HCN = hydrogen cyanide; SA = salicylic acid; 2,3 DHBA = 2, 3-dihydroxybenzoic acid. ‘+’ and ‘–‘ represent positive and negative reactions, respectively. Values are the mean of three independent replicates. Mean values denoted with different letters are significantly different (p ≤ 0.05) as determined by the DMRT test. Values represent means ± SDs. ‘+’, ‘++’, and ‘+++’ denote low, moderate, and high production, respectively.