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Published in Crop Sci 9:771-774 (1969)
© 1969 Crop Science Society of America
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Interactive Effects of Temperature and Osmotic Potential on the Germination of Range Plants1

N. H. Tadmor, Y. Cohen and Y. Harpaz2

Germination of Oryzopsis holciformis (M.B.) Hack, Phalaris tuberosa L., Medicago polymorpha L., Medicago truncatula Gaertn., and cultivars of wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.) were compared in D-mannitol solutions of 0, 0.1, 0.3, 1.0, 4.0, 8.0 and 15 atm. osmotic concentration at 4, 10, 15, 20 and 25 C. The effect of temperature X osmotic potential interaction differed with the aspect of germination investigated. Onset of germination was delayed in all species by an osmotic potential above 4 atm. In Phalaris and Oryzopsis, onset of germination also was negatively correlated with temperature. Final germination percentage was dependent on the temperature X osmotic potential interaction in all range species. The more the temperature diverged from the optimum for germination, the more final germination became dependent on osmotic potential. The rate of germination was greatly affected by temperature at all osmotic potentials in all species, while the effect of osmotic potential was greatly dependent on temperature.

Key Words: Seed germination • Arid range seeding

1 Contribution from the Volcani Institute of Agricultural Research (N.U.I.A.), Bet Dagan, Israel. 1969 Series, No. 1512-E. Supported by the U.S. Department of Agriculture under P.L. 480, Research Contract No. A10-CR-45.

2 Senior Lecturer in Botany, the Hebrew University of Jerusalem; and Research Agronomists, Division of Pasture Research, The Volcani Institute of Agricultural Research, Bet Dagan. The authors are indebted to Miss Na'ava Aisland for her valuable help in the laboratory.

Received for publication May 6, 1969.




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