Table 2.

Water potential thresholds describing the maximum (Ψ_b95), median (Ψ_b50) and minimum (Ψ_b5) (mean ± s.e., n = 4) responses of untreated florets, wet/dry-cycled (WD) florets and cleaned seeds in Triodia

Triodia species	Dormancy state	Ψ b95 [MPa]	Ψ b50 [MPa]	Ψ b5 [MPa]
Triodia basedowii	Florets	0.0 ± 0.0	−0.01 ± 0.01	−0.05 ± 0.01
	Seeds	−0.1 ± 0.01 t= 6.31***	−0.24 ± 0.01 t= 6.31***	−0.49 ± 0.05 t= 6.31***
Triodia epactia	Florets	−0.14 ± 0.03	−0.27 ± 0.01	−0.36 ± 0.04
	WD Florets	−0.12 ± 0.03t=−0.21	−0.30 ± 0.02t=−1.06***	−0.39 ± 0.07t=0.65
	Seeds	−0.11 ± 0.01t=0.66	−0.44 ± 0.01t=−3.04***	−0.88 ± 0.1t=-7.14***
Triodia lanigera	Florets	−0.04 ± 0.03	−0.18 ± 0.03	−0.32 ± 0.07
	Seeds	−0.03 ± 0.01t=0.19	−0.24 ± 0.02t=−1.21	−0.49 ± 0.06t=2.20***
Triodia pungens	Florets	−0.12 ± 0.02	−0.24 ± 0.01	−0.36 ± 0.04
	WD Florets	−0.13 ± 0.02t=−0.21	−0.27 ± 0.01t=−1.06***	−0.40 ± 0.04t=-0.65
	Seeds	−0.11 ± 0.01t=0.34	−0.37 ± 0.01t=−6.78***	−0.73 ± 0.06t=-8.01***
Triodia sp. Shovelanna Hill	Florets	0.0 ± 0.0	−0.01 ± 0.01	−0.1 ± 0.1
	Seeds	0.0 ± 0.0t=0.03	−0.18 ± 0.02t=−5.81***	−0.4 ± 0.05t=-6.91***
Triodia wiseana	Florets	−0.09 ± 0.02	−0.23 ± 0.01	−0.38 ± 0.03
	WD Florets	−0.07 ± 0.03t=0.5	−0.26 ± 0.03t=2.59	−0.41 ± 0.03t=−0.46
	Seeds	−0.07 ± 0.01t=0.73	−0.41 ± 0.01t=−5.06***	−0.78 ± 0.07t=−8.32***

Untreated, WD florets and cleaned seeds were plated onto Petri dishes containing different PEG solutions simulating moisture stress. Experimental responses in T. basedowii, T. lanigera and T. sp Shovelanna Hill were omitted due to lack of germination following wet/dry cycling.

Water potentials were calculated from a three-parameter Weibull function for germination data across water potentials.

Summary statistics (t-statistics and P-values) are shown for WD florets and cleaned seeds for comparison with untreated florets only. Asterisks show the significance level at P < 0.001 (***).