Table 4.

Effect of Streptomyces sp. on root and hypocotyl length of seedlings of cultivated rocket, lamb lettuce, lettuce and tomato in vitro

	Length (mm)	Seed treatment
		Untreated control	S. anulatus CMJ58I	S. albidoflavus VT111I	S. cyaneus ZEA17I
Cultivated rocket	Radicle	15.52 ± 1.00a cb	46.83 ± 2.11 a	31.11 ± 1.79 b	29.77 ± 2.05 b
	Hypocotyl	9.34 ± 0.31 b	11.53 ± 0.36 a	11.11 ± 0.34 a	11.75 ± 0.40 a
	N	253	239	255	222
Lamb lettuce	Radicle	16.79 ± 0.51 b	26.35 ± 0.74 a	11.00 ± 0.33 c	9.08 ± 0.42 c
	Hypocotyl	11.28 ± 0.37 b	14.55 ± 0.34 a	10.41 ± 0.30 bc	9.24 ± 0.37 c
	N	266	272	261	255
Lettuce	Radicle	16.33 ± 0.68 d	39.22 ± 1.95 b	28.31 ± 1.50 c	58.59 ± 2.10 a
	Hypocotyl	2.97 ± 0.06 b	2.77 ± 0.05 b	2.95 ± 0.06 b	3.51 ± 0.06 a
	N	239	235	245	253
Tomato	Radicle	54.17 ± 1.09 b	59.33 ± 1.45 a	63.96 ± 1.55 a	63.41 ± 1.00 a
	Hypocotyl	11.52 ± 0.26 c	13.41 ± 0.33 b	14.69 ± 0.32 a	14.79 ± 0.29 a
	N	285	288	289	290

^a The mean value followed by standard error

^b Tukey post-hoc test; mean values in a row with the same letters are not significantly different (P = 0.05); ns not significant