Possible mechanisms of afterripening in Xanthium seeds
Version of Record online: 28 APR 2006
Volume 87, Issue 3, pages 359–364, March 1993
How to Cite
Esashi, Y., Ogasawara, M., Górecki, R. and Leopold, A. C. (1993), Possible mechanisms of afterripening in Xanthium seeds. Physiologia Plantarum, 87: 359–364. doi: 10.1111/j.1399-3054.1993.tb01742.x
- Issue online: 28 APR 2006
- Version of Record online: 28 APR 2006
- Received 11 September. 1992; revised 19 October, 1992
- relative humidity;
- seed dormancy;
- seed germination water content;
- Xanthium pennsylvanicum.
Breaking dormancy in some seeds requires a period of dry storage. In the seeds of Xanthium pennsylvanicum Wallr., the process of afterripening proceeds optimally at water contents between 7 and 14%: this range of dehydration can be identified with water binding region 2, in which water is bound with low enthalpy. At water contents below 7%. Seeds remained primarily dormant over 3 years. Attempts to alter the afterripening with atmospheres of elevated nitrogen showed no effect. and with oxygen there was no consistent effect. There were no changes is osmotic value of the seed sap, or in its sugar or amino acid contents. We speculate that afterripening in Xanthium may involve some nonenxymatic reactions which remove substances which inhibit germination. Candidates for these reactions include the Amadori and Maillard reactions.