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Annals of Botany 82: 555-560, 1998
© 1998 Annals of Botany Company

Effect of Dormancy Relieving Compounds on the Seed Germination of Non-dormantAllenrolfea occidentalisunder Salinity Stress

BILQUEES GUL+, and DARRELL J. WEBER

Department of Botany and Range Sciences, Brigham Young University, Provo, Utah, 84602-5181, USA

December 9, 1997 ; April 24, 1998 . June 2, 1998 .

Allenrolfea occidentalis(Chenopodiaceae) is a highly salt tolerant plant species that is widely distributed in inland salt marshes and salt playas of the western United States. We investigated the influence of dormancy-relieving compounds (fusicoccin, ethephon, nitrate and thiourea) in alleviating salinity stress on the seed germination ofA. occidentalis. Seed germination decreased with an increase in salinity and no seed germinated at 800 mMNaCl. Fusicoccin (5 µM), ethephon (10 mM) and nitrogenous compounds (20 mMnitrate and 10 mMthiourea) were able to counteract the inhibition produced by salinity treatments. All dormancy relieving compounds significantly (P<0.0001) promoted germination at all salinity concentations. Fusicoccin completely reversed the inhibitory effects of salinity on seed germination ofA. occidentalis. Ethephon application significantly promoted germination at all salinities. Nitrate and thiourea were relatively less effective in alleviating the effects of high salinity on germination.Copyright 1998 Annals of Botany Company

Allenrolfea occidentalis, ethephon, fusicoccin, halophyte, dormancy, nitrate, salinity, seed germination, thiourea.


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