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- Title
Effect of fusicoccin and gibberellic acid on primary dormant Avena fatua caryopses.
- Authors
Foley, Michael E.
- Abstract
Fusicoccin induced germination in dormant and partially afterripened dormant caryopses of Avena fatua L. The rate of caryopsis germination was slower and final percentage germination lower in the highly dormant inbred line M73 at a given concentration of fusicoccin than in the dormant caryopses of line AN265. Gibberellic acid was more effective than fusicoccin in breaking dormancy in both lines. Promotion of germination of dormant caryopses by fusicoccin was inhibited by a 6-day pretreatment with (2-chloroethyl)trimethylammonium chloride. The basal rate of proton efflux from embryos isolated from dormant and fully after-ripened line AN265 caryopses was similar. Addition of fusicoccin increased the rate of proton efflux from the isolated embryos of dormant and afterripened caryopses by nearly 400%. Gibberellic acid had no effect on the rate of proton extrusion. The uptake of 86Rb+ in dormant and afterripened A. fatua embryos was similar after a 2 h uptake period. The addition of fusicoccin to the medium doubled the uptake of 86Rb+ by dormant and afterripened embryos. Gibberelleic acid had no effect on the uptake of 86Rb+ by isolated embryos from either dormant or afterripened caryopses. The experimental results indicate that gibberellic acid is more versatile in its action than fusicoccin, and gibberellic acid may facilitate dormant A. fatua caryopsis germination by stimulating mechanisms other than the direct H+ efflux and K+ uptake at the membrane level.
- Subjects
GIBBERELLIC acid; CARYOPSES; FRUIT; WILD oat; GERMINATION; PLANT embryology
- Publication
Physiologia Plantarum, 1986, Vol 67, Issue 4, p690
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1986.tb05079.x