Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 16:201-204 (1976)
© 1976 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Recovery of Hardened Barley from Winter Injuries1

C. R. Olien and B. L. Marchetti2

A distinct pattern of injury is caused by high intensity freezing. This type of stress results from rapid transfer of latent heat as the temperature slowly decreases (1 C/hour) in plant tissues at a high moisture content. Because the high moisture content is induced by flooding before freezing, effects of flooding and freezing were compared and distinguished. The roots and lower crown tissues of ‘Hudson’ barley (Hordeum vulgare L.) are severely injured by high intensity freezing, while the leaves and upper crown tissues are relatively unaffected. Surgical removal of injured tissues at the start of recovery, before degeneration had occurred, significantly improved survival. Detoxification mechanisms might affect winterhardiness.

Preliminary tests indicated that degenerating root tissues became generally toxic during the first few days of incubation at room temperature. New root formation from vegetative barley plants, seed germination of barley, and growth of Bacillus subtilis Cohn em. Prazm. were inhibited by association with degenerating root tissues. This general toxicity may affect winterhardiness by influencing recovery. Secondary degeneration of injured roots and crown tissues did reduce survival by affecting crown meristems. However the aseptic effect might aid in control of infection.

Key Words: Freeze injury • Root degeneration • Hordeum vulgare L.

1 Cooperative investigations of the ARS, USDA and Michigan Agric. Exp. Stn., East Lansing,, MI 48824. Exp. Stn. Journal Article No. 7189.

2 Plant physiologist and biological laboratory technician, ARS, USDA, Crop and Soil Science Dep., Michigan State Univ., East Lansing, MI 48824.

Received for publication April 10, 1975.




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