Fig. 5.

Unidirectional Na⁺ influx in 21-day-old seedlings of IR29 and Pokkali, grown and measured at 25 mM [Na⁺]_ext and 0 or 3 mM Si. Plants were loaded for 2 min in radioactive solution, then desorbed first for 5 s and then for 7 min in non-radioactive solution. Different lower case letters (a, b) indicate significant differences between conditions (t-test, P<0.05). Data are represented as the mean ±SEM (n=3). Measurements taken at 30 °C in seedlings grown under a 30/20 °C (day/night) temperature cycle. Unidirectional influx values, derived using compartmental analysis at cultivar-specific EC₅₀s, can be found in Supplementary Fig. S4.