Table 2.

Gas-exchange and PSII efficiency parameters of StSXD1-silenced potato plants after 14-days’ exposure to salt stress^a

	Treatment
	Genotype	Control	Salt stress
A (μmol CO2 m–2 s–1)	Wild type	5.70±1.80a	2.40±0.59a*
	SXD1:RNAi 21	4.43±2.28a	0.85±0.13b*
	SXD1:RNAi 22	4.95±1.62a	1.38±0.64b*
E (mmol m–2 s–1)	Wild type	1.36±0.68a	0.43±0.12a*
	SXD1:RNAi 21	1.12±0.91a	0.20±0.05b*
	SXD1:RNAi 22	1.05±0.43a	0.27±0.11b*
ETR	Wild type	69.1±2.3a	59.3±5.5a*
	SXD1:RNAi 21	71.2±6.4a	51.0±6.4a*
	SXD1:RNAi 22	71.5±7.2a	56.5±8.5a*
Fv/Fm	Wild type	0.797±0.016a	0.789±0.017a
	SXD1:RNAi 21	0.784±0.011a	0.759±0.075a
	SXD1:RNAi 22	0.806±0.024a	0.794±0.026a

^a Data correspond to middle leaves (leaf 8) and represent the means ± SD of 4–5 individual plants. Data were analysed by t-test: significant differences among genotypes within a treatment are indicated by different letters for each parameter, and significant differences between control and salt stress within a genotype are indicated by an asterisk (P < 0.05).