OTU numbers and biodiversity estimators of lettuce after treatment with an organic acid^a.

Treatment	Total OTU	Genus OTU	Chao 1	ACE
AA	731 ± 88	689 ± 73	851.39 ± 158.48a	881.46 ± 176.38ab
PA	625 ± 110	592 ± 101	731.77 ± 188.60a	739.22 ± 191.66a
LA	675 ± 90	638 ± 85	771.04 ± 163.33a	811.50 ± 190.27ab
TA	811 ± 136	765 ± 121	918.97 ± 160.87a	973.27 ± 173.99b
SA	758 ± 96	717 ± 91	880.87 ± 139.29a	914.67 ± 146.61ab
MA	738 ± 70	701 ± 58	840.10 ± 151.71a	863.30 ± 151.36ab
CA	758 ± 85	710 ± 78	868.05 ± 147.93a	902.00 ± 157.64ab
Control	749 ± 76	706 ± 71	832.02 ± 148.84a	858.62 ± 167.63ab

^aValues (mean ± SD) in the same column with different letters are significantly different (p < 0.05). OTU: operational taxonomic unit; control: distilled water, CA: citric acid, MA: malic acid, LA: lactic acid, TA: tartaric acid, SA: succinic acid, PA: propionic acid, AA: acetic acid.