Table 1.

Effect of different magnitude of PEG-induced imbibitional dehydration stress (− 0.344, − 0.851 and − 1.619 MPa) on germination and early growth performances [assessed in terms of T₅₀, Vigour Index (VI), Relative Germination Performance (RGP), Relative Growth Index (RGI) and Relative Water Content (RWC)] of four indigenous aromatic rice varieties of Oryza sativa L. (Cultivars Tulaipanji, Sitabhog, Badshabhog and Jamainadu)

Early growth performances	Landraces of aromatic rice	Imbibitional dehydration stress [IDS] (MPa)
		Untreated control	− 0.344	− 0.851	− 1.619
T50 (h)	Jamainadu	26.09 ± 0.05	22.22 ± 0.14**	31.58 ± 0.19	150 ± 0.54
	Tulaipanji	26.09 ± 0.08	19.35 ± 0.05**	24 ± 0.03**	25 ± 0.04**
	Sitabhog	37.5 ± 0.23	40 ± 0.25	60 ± 0.19	300 ± 1.4
	Badshabhog	75 ± 0.23	120 ± 0.41	100 ± 0.82	100 ± 0.27
Vigor index (VI)	Jamainadu	0.148 ± 0.001	0.083 ± .0003**	0.106 ± 0.007	0.067 ± 0.001**
	Tulaipanji	0.082 ± 0.001	0.052 ± 0.0003**	0.060 ± 0.001**	0.079 ± 0.0003**
	Sitabhog	0.084 ± 0.001	0.074 ± 0.001**	0.063 ± 0.001**	0.099 ± 0.001
	Badshabhog	0.122 ± 0.016	0.069 ± 0.003	0.060 ± 0.002	0.138 ± 0.005
Relative germination performance (RGP)	Jamainadu	100.00 ± 0	104.44 ± 0.27	86.66 ± 0.19**	51.11 ± 0.25**
	Tulaipanji	100.00 ± 0	100.00 ± 0	100.00 ± 0	100.00 ± 0
	Sitabhog	100.00 ± 0	88.88 ± 0.26**	77.77 ± 0.19**	80.55 ± 0.15**
	Badshabhog	100.00 ± 0	120.00 ± 0.68	100.00 ± 0.27	92.00 ± 0.22**
Relative growth index (RGI)	Jamainadu	100.00 ± 0	99.03 ± 0.23	101.44 ± 0.54	95.65 ± 0.24*
	Tulaipanji	100.00 ± 0	106.03 ± 0.82	108.62 ± 0.54	104.31 ± 0.27
	Sitabhog	100.00 ± 0	102.02 ± 0.41	91.91 ± 0.27**	102.02 ± 0.54
	Badshabhog	100.00 ± 0	104.12 ± 0.68	101.03 ± 0.41	109.28 ± 0.98
Relative water content (RWC)	Jamainadu	91.7 ± 0.22	89.20 ± 0.19**	88.78 ± 0.15**	83.50 ± 0.17**
	Tulaipanji	90.23 ± 0.18	90.96 ± 0.16	89.27 ± 0.15**	86.25 ± 0.14**
	Sitabhog	92.00 ± 0.21	89.20 ± 0.19**	83.62 ± 0.17**	81.20 ± 0.16**
	Badshabhog	87.05 ± 0.20	84.32 ± 0.17**	82.62 ± 0.13**	82.44 ± 0.14**

Results are mean of three replicates ± standard error

* Significant from control at 0.05 level (t test); ** significant from control at 0.01 level (t test)