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Endogenous ABA concentration in embryos of annual ryegrass seeds. Seeds were stratified for 21 d at 20 °C in the dark or light and then transferred to germination conditions for a further 3 d. Embryo ABA concentration was measured in subsamples of seeds at 0, 21, and 24 d after the start of imbibition. Values are means ±SE (n=3). Data were analysed by two-factor ANOVA, and different letters above the bars indicate a significant difference at the 5% level (pooled LSD value=1.5).
