Table 3.

Functional screening of selected tea rhizobacteria for in vitro PGP and antifungal activities.

Sl No	Sample	Plant growth promoting traits					Antifungal traits
		IAA production (µg ml−1)*	IAA production when supplemented with Tryptophan (µg ml−1)*	Siderophore production (%)*	Phosphate solubilization (µg ml−1)*	Ammonia production#	Protease production (qualitative)	Cellulase production (qualitative)	ACC deaminase (qualitative)	Anti fungal activity against R. solani
1	AB200	6.67 ± 2.86	15 ± 2.36	97.21 ± 0.56	30 ± 2.52	Moderate	−	−	−	+
2	AB201	1.95 ± .034	7.97 ± 1.03	95.05 ± 1.15	230.52 ± 8.75	Small	+	+	+	−
3	AB203	0.76 ± .19	20.34 ± 1.26	98.88 ± 0.42	175.88 ± 8.42	Small	−	+	−	−
4	AB209	3.67 ± 0.47	14.83 ± 2.63	52.31 ± 4.46	280.18 ± 69.09	Large	+	−	−	+
5	AB212	0.68 ± .024	30 ± 2.71	92.71 ± 2.16	275.58 ± 43.63	Moderate	−	−	−	+
6	AB214	3.33 ± 0.36	16.67 ± 1.43	72.07 ± 3.67	572.62 ± 23.59	Moderate	+	+	−	+
7	AB228	1.36 ± 0.72	9.92 ± 6.11	98.55 ± 1.50	51.99 ± 2.04	Small	−	+	−	+
8	AB230	25.33 ± 2.83	37.33 ± 2.83	97.69 ± 1.49	794.86 ± 12.87	Moderate	+	−	+	−
9	AB233	10.33 ± 1.89	20 ± 2.84	94.77 ± 3.22	187.19 ± 37.26	Small	+	+	−	+
10	AB236	25.33 ± 2.83	56.33 ± 3.33	94.43 ± 1.04	22 ± 2.05	Moderate	+	−	+	−
11	AB237	22 ± 0.47	25.33 ± 1.89	75.05 ± 1.64	635.75 ± 18.89	Large	+	−	−	+
12	AB242	4 ± 1.41	38 ± 3.33	72.56 ± 2.46	12 ± 3.0	Large	−	−	+	−
13	AB246	16.5 ± 0.71	20 ± 0.47	80.25 ± 4.60	591.28 ± 53.44	Moderate	+	−	−	+
14	AB255	7 ± .94	15.33 ± 2.83	99.26 ± 1.21	191.51 ± 8.31	Small	+	−	+	−
15	AB266	9.67 ± 1.41	39.33 ± 1.86	88.18 ± 2.77	70.12 ± 5.92	Small	−	−	+	+
16	AB267	7 ± 2.83	12 ± 2.83	68.77 ± 3.69	335.62 ± 23.59	Small	+	−	−	+
17	AB276	15 ± 2.36	16.67 ± 2.86	97.21 ± 0.56	21.78 ± 5.75	Moderate	−	−	+	+
18	AB285	34.67 ± 4.24	27 ± 3.29	93.25 ± 1.25	229.40 ± 24.67	Small	−	−	+	+
19	AB286	4 ± 1.42	15.67 ± 1.89	82.71 ± 1.25	33.52 ± 4.25	Moderate	+	−	−	−
20	AB304	55.17 ± 5.42	90 ± 4.33	83.87 ± 2.26	137.52 ± 14.41	Large	+	+	−	+
21	AB312	9.17 ± 3.06	113 ± 2.36	99.01 ± 0.21	252.83 ± 9.35	Large	+	−	−	−
22	AB320	28.17 ± 2.12	74.83 ± 5.89	98.21 ± 0.24	452.65 ± 1.28	Moderate	+	+	−	−
23	AB321	13.83 ± 3.06	58.33 ± 2.36	98.92 ± 0.49	446.76 ± 3.84	Moderate	+	−	+	+
24	AB328	15.33 ± 0.47	99.83 ± 2.12	98.42 ± 0.42	577.71 ± 53.83	Moderate	+	−	−	−
25	AB330	26.17 ± 1.18	53 ± 2.65	97.07 ± 0.11	312.37 ± 6.73	Small	+	−	−	+
26	AB331	25.17 ± 3.54	134.67 ± 3.59	93.60 ± 0.07	275.49 ± 4.57	Large	+	+	+	+
27	AB332	19.33 ± 2.36	48.83 ± 2.78	96.38 ± 0.31	522.89 ± 26.27	Large	−	−	+	−
28	AB336	19.67 ± 3.77	30.67 ± 2.71	97.76 ± 0.45	822.39 ± 41.97	Moderate	+	−	−	+
29	AB341	13 ± 4.71	28.50 ± 1.18	93.99 ± 0.41	728.55 ± 71.77	Small	+	−	+	+
30	AB345	9 ± 1.41	60.50 ± 2.42	98.60 ± 0.24	841.42 ± 10.89	Moderate	+	−	−	−

*Mean value (all values are triplicate) ± Standard deviation (SD), + means positive activity and—means no activity.

^# Ammonia production attributes are equivalent to Small: 1–3 µmole ml⁻¹ , Moderate: 3–6 µmole ml⁻¹, and Large: > 6 µmole ml⁻¹.