The use of osmoregulators and antioxidants to mitigate the adverse impacts of salinity stress in diploid and tetraploid potato genotypes (Solanum spp.)

Chemical and Biological Technologies in Agriculture

Table 3 Chlorophyll (SPAD), catalase (U min⁻¹ g⁻¹ FW) and peroxidase (U min⁻¹ g⁻¹ FW) of 13 genotypes of potato divided into 7 tetraploid cultivars of Solanum tuberosum (tbr), and 6 diploid clones of S. chacoense (chc) grown in vitro under stress conditions

Genotypes	Chlorophyll (SPAD)		Catalase (U min⁻¹ g⁻¹ FW)		Peroxidase (U min⁻¹ g⁻¹ FW)
Genotypes	Control	Stress	Control	Stress	Control	Stress
Tetraploid cultivars of S. tuberosum (tbr)
Agata	48.5	33.4	1.32	3.8	1.29	3.5
Atlantic	49.6	35.0	1.39	3.9	1.32	3.5
Anya	46.5	23.7	1.34	4.0	1.24	4.1
Diamond	50.4	41.1	1.33	3.7	1.35	3.4
Gala	45.6	22.7	1.33	4.03	1.23	4.1
Kennebec	47.6	32.8	1.35	3.9	1.25	3.9
Russet Burbank	49.5	34.7	1.36	3.8	1.31	3.5
Diploid clones of S. chacoense (chc)
A-6	47.5	42.1	1.41	2.1	1.34	1.8
B-7	48.5	28.2	1.45	3.2	1.25	3.2
C-8	47.6	42.4	1.44	1.9	1.35	1.7
C-9	49.5	35.7	1.42	4.3	1.26	3.5
D-2	47.1	41.8	1.43	2.1	1.32	1.9
D-3	47.3	35.4	1.41	4.2	1.3	3.3
LSD (0.05)	2.451		0.305		0.201

Explants were grown on media supplemented with three different concentrations of NaCl (100, 200 or 300 mmol L−1) and the average tested parameters over the combined three levels of stress were compared with the control (no stress)