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Interactions of alcohols and increased air pressure on Echinochloa crus-galli (L.) Beauv. seed germination

Taylorson, R.B.
Annals of botany 1991 v.68 no.4 pp. 337-340
Echinochloa crus-galli, seed germination, dormancy breaking, butanol, atmospheric pressure, 1-propanol, air
In contrast to previous findings, where stimulation of E. crus-galli seed germination by n-propanol was reversed by simultaneous treatment with 0.965 MPa air pressure, similar pressure was unable to reverse stimulation by n-butanol. When pressure was applied up to 2 d prior to n-propanol, stimulation by n-propanol was still prevented. Pressure appeared to exert its effect rapidly: only 15 min exposure gave the maximum effect. If temperature during treatment with pressure and n-propanol was 15 degrees C, rather than 35 degrees C, the inhibitory effect was not observed. The inhibitory action of pressure can persist but is not lethal since drying the seeds after n-propanol and pressure treatment restored high levels of responsiveness to red irradiation. These several facts suggest that pressure may not simply prevent the action of alcohols (anaesthetics) as previously thought, but may have an action of its own, which may only be apparent upon interaction with specific compounds, e.g. n-propanol.