Table 2.

Comparison and analysis of root traits of transgenic GmXTH1 soybean at seedling stage under different drought conditions

		M18	OEA1	OEA2	IEA1	IEA2
Normal irrigation	TL (cm)	130.17 ± 0.28	176.81 ± 2.41**	159.03 ± 0.89**	106.32 ± 3.01**	100.96 ± 4.45**
	SA (cm2)	20.14 ± 2.18	34.18 ± 3.56**	31.37 ± 4.15*	20.59 ± 1.71	15.19 ± 0.44*
	PA (cm2)	6.41 ± 0.69	10.88 ± 1.13**	9.99 ± 1.32*	6.55 ± 0.55	4.83 ± 0.14**
	Vol (cm3)	0.25 ± 0.05	0.53 ± 0.10**	0.51 ± 0.14**	0.32 ± 0.06*	0.18 ± 0.02*
	AvgD (mm)	0.49 ± 0.05	0.61 ± 0.06**	0.63 ± 0.08**	0.62 ± 0.07**	0.48 ± 0.03
	TNT	892.33 ± 32.20	1293.00 ± 139.08**	1151.30 ± 168.00**	854.67 ± 76.22	790.00 ± 42.06**
	TNF	897.33 ± 149.63	1564.00 ± 242.09**	1559.00 ± 13.80**	909.67 ± 24.22	791.67 ± 78.25**
	TNC	60.33 ± 9.21	127.67 ± 6.84**	101.00 ± 7.77**	56.00 ± 10.69	47.67 ± 7.42*
Drought 7 days	TL (cm)	337.66 ± 10.31	508.61 ± 36.97**	392.67 ± 17.74*	242.28 ± 2.56**	239.18 ± 3.10**
	SA (cm2)	91.87 ± 12.20	134.47 ± 5.51**	107.74 ± 28.40*	52.08 ± 1.69**	51.47 ± 7.56**
	PA (cm2)	29.24 ± 3.88	42.80 ± 1.75**	34.30 ± 9.04*	16.58 ± 0.54**	16.38 ± 2.41**
	Vol (cm3)	2.05 ± 0.54	2.84 ± 0.16**	2.59 ± 1.01*	0.89 ± 0.07**	0.92 ± 0.25**
	AvgD (mm)	0.86 ± 0.10	0.84 ± 0.04	0.85 ± 0.20	0.68 ± 0.03*	0.69 ± 0.10*
	TNT	2751.67 ± 237.17	3608.00 ± 87.50**	2376.33 ± 269.22*	1637.67 ± 156.33**	2012.67 ± 160.32*
	TNF	5871.33 ± 259.68	9039.33 ± 147.54**	5782.00 ± 1231.13	2400.33 ± 38.67**	3211.33 ± 494.89**
	TNC	434.33 ± 23.38	671.00 ± 36.59**	404.33 ± 57.91	150.00 ± 3.00**	222.00 ± 43.11**
Drought 15 days	TL (cm)	243.86 ± 13.06	295.09 ± 6.74**	280.27 ± 3.22**	206.55 ± 10.91**	199.16 ± 6.44**
	SA (cm2)	50.33 ± 14.08	80.15 ± 9.88**	58.12 ± 5.55*	51.65 ± 9.92	38.63 ± 2.39**
	PA (cm2)	16.02 ± 4.48	25.51 ± 3.14**	18.50 ± 1.77	15.09 ± 2.10	12.30 ± 0.76*
	Vol (cm3)	0.91 ± 0.45	1.78 ± 0.38**	0.98 ± 0.17	0.83 ± 0.16	0.60 ± 0.06**
	AvgD (mm)	0.64 ± 0.14	0.87 ± 0.09**	0.66 ± 0.06	0.70 ± 0.05	0.62 ± 0.03
	TNT	1847 ± 132.22	2342.33 ± 111.44**	1859 ± 160.07	1292.67 ± 99.34**	1380 ± 17.39**
	TNF	2986.67 ± 785.96	5311.33 ± 444.03**	3661.33 ± 727.30**	2196.33 ± 371.68**	2102 ± 129.19**
	TNC	238.67 ± 20.51	379 ± 9.07**	283.33 ± 63.60**	136.67 ± 31.00**	145 ± 1.00**

Within a row and treatment (normally or drought), values followed by asterisks are significantly different from M18. *P < 0.05; **P < 0.01