Table 2.

Effect of different magnitude of PEG-induced imbibitional dehydration stress (− 0.344, − 0.851 and − 1.619 MPa) on ascorbate (total ascorbate, ascorbate and dehydroascorbate) and dehydroascorbate reductase of four indigenous aromatic rice varieties of Oryzasativa L. (Tulaipanji, Sitabhog, Badshabhog and Jamainadu)

Landraces of aromatic rice	Treatment	Total ascorbate (mg g−1 dm)	Ascorbate (mg g−1 dm)	Dehydroascorbate (mg g−1 dm)	Dehydroascorbate reductase (A265 min−1 g−1 dm)
Jamainadu	Untreated control	2.682 ± 0.03	2.424 ± 0.02	0.258 ± 0.016	0.447 ± 0.020
	IDS (− 0.344 MPa)	2.121 ± 0.02**	1.995 ± 0.02**	0.126 ± 0.009	0.297 ± 0.019**
	IDS (− 0.851 MPa)	1.721 ± 0.03**	1.619 ± 0.03**	0.103 ± 0.002	0.218 ± 0.022**
	IDS (− 1.619 MPa)	1.568 ± 0.02**	1.430 ± 0.02**	0.139 ± 0.005*	0.141 ± 0.016**
Tulaipanji	Untreated control	2.466 ± 0.02	2.282 ± 0.01	0.185 ± 0.003	0.356 ± 0.010
	IDS (− 0.344 MPa)	2.101 ± 0.02**	1.933 ± 0.02**	0.168 ± 0.004*	0.347 ± 0.011
	IDS (− 0.851 MPa)	2.046 ± 0.02**	1.841 ± 0.02**	0.205 ± 0.002	0.300 ± 0.009**
	IDS (− 1.619 MPa)	2.139 ± 0.01**	1.773 ± 0.02**	0.366 ± 0.007	0.179 ± 0.014**
Sitabhog	Untreated control	2.068 ± 0.01	2.029 ± 0.02	0.039 ± 0.001	0.076 ± 0.008
	IDS (− 0.344 MPa)	2.266 ± 0.02	2.148 ± 0.02	0.117 ± 0.006	0.062 ± 0.006
	IDS (− 0.851 MPa)	1.576 ± 0.03**	1.556 ± 0.02**	0.020 ± 0.005	0.047 ± 0.008**
	IDS (− 1.619 MPa)	1.379 ± 0.03**	1.349 ± 0.02**	0.030 ± 0.007	0.035 ± 0.005
Badshabhog	Untreated control	1.829 ± 0.02	1.784 ± 0.01	0.046 ± 0.004	0.144 ± 0.026
	IDS (− 0.344 MPa)	1.435 ± 0.02**	1.389 ± 0.01**	0.046 ± 0.01	0.165 ± 0.027
	IDS (− 0.851 MPa)	1.479 ± 0.03**	1.313 ± 0.02*	0.167 ± 0.04	0.185 ± 0.027
	IDS (− 1.619 MPa)	1.295 ± 0.03**	1.200 ± 0.03**	0.095 ± 0.001	0.044 ± 0.006

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)