The release of secondary dormancy by ethylene in Amaranthus caudatus L. seeds
2003
Kępczyński, Jan | Bihun, Magdalena | Kępczyñska, Ewa
Neither ethylene nor 1-aminocyclopropane-1-carboxylic acid (ACC) was able to prevent the induction of secondary dormancy of Amaranthus caudatus at 45°C. Both ethylene (4.5 × 10(-9)–4.5 × 10(-7) M) and ACC (10(-3)–10(-2) M) removed secondary dormancy at 25°C, although ethylene was much more effective. The presence of ethylene for only 10 h was sufficient to remove secondary dormancy in almost all seeds. Incubation of secondary dormant seeds for up to 5 d at 25°C did not change sensitivity to ethylene. The breaking of secondary dormancy by ethylene was prevented by 2,5-norbornadiene (NBD; 1.5 × 10-5(-3) × 10(-4) M), indicating the physiological action of ethylene. Abscisic acid (ABA; 10(-4)–10(-3) M) increased the requirement for exogenous ethylene. It is suggested that secondary dormancy in A. caudatus seeds might be related to insufficient ethylene production associated with an insufficient amount of ACC.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by National Agricultural Library