Table 2.

Parameters of glutamate induced series of action potentials in Helianthus annuus seedlings growing under osmotic and salt stresses.

Hydroponic medium (mM)	Number of studied plants	% of excitable plants	n	APs series
				APs number	Series duration (min)
Distilled water	7	29	2	5 ± 2	13 ± 2
Nutrient solution (control)	10	100	10	10 ± 1	20 ± 5
160 mM D-sorbitol	14	100	14	10 ± 1	22 ± 5
80 mM KCl	16	100	16	11 ± 1	35 ± 3*
80 mM NaCl	8	50	4	7 ± 1	16 ± 5
160 mM KCl	12	58	7	2.4 ± 0.2***	9 ± 2
160 mM NaCl	13	69	9	2.8 ± 0.3***	33 ± 15

The duration of the series is the time between the first and the last AP in the series. n—number of excitable plants. AP number: data non-normally distributed, unequal variance (Levene's test p = 0.0020), Kruskal-Wallis ANOVA (Chi square = 27.22 df = 6 p = 0.0001). Series duration: data non-normally distributed, unequal variance (Levene's test p = 0.0421), Kruskal-Wallis ANOVA (Chi square = 13.57 df = 6 p = 0.0421). Mann-Whitney U-test was used to assess the statistical difference between the control plants and each sunflower group growing in different nutrients. p-value ranges are marked by asterisks:

^***p < 0.001,

^*p < 0.05.