The induction of secondary seed dormancy by oxygen deficiency in a barnyard grass Echinochloa crus-galli.
At 25°C, secondary dormancy was induced in E. crus-galli seeds exposed for 100 d to oxygen deficiency. Hypoxia did not induce dormancy at 15° or prevent dormancy termination at 7°. Secondary dormancy was terminated after 2 months stratification at 7°. It was concluded that oxygen deficiency may increase the proportion of dormant seeds in the soil, and affect the dynamics of the E. crus-galli soil seed bank.