Table 6.

Rates of Rb⁺ and K⁺ influx for coleoptiles grown in normoxic (aerated), hypoxic (3% O₂), and anoxic (N₂) solution Three-day-old seedlings were transferred to fresh solution containing 0.25 mM of Rb⁺ or K⁺. Triplicate 50 ml samples were taken from the growth solution every hour for 4 h. Coleoptiles were excised and weighed. Total amounts of Rb⁺/K⁺ uptake were determined using a flame photometer. Data are mean and SEM (n=3). Statistically different data across treatments (Tukey–Kramer, α=0.05) are indicated by different letters.

Treatment	Rubidium influx (μmol Rb+ g−1 FW h−1)	Net potassium influx (μmol K+ g−1 FW h−1)
Normoxic	3.9±0.2 a	3.0±0.3 a
Hypoxic	3.6±0.3 a	2.6±0.1 a
Anoxic	0.8±0.2 b	0.9±0.2 b