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Short-Term Exposure to Atmospheric Ammonia does not Affect Low-Temperature Hardening of Winter Wheat

Johannes M. A. M. Clement, Jan Henk Venema and Philip R. van Hasselt
The New Phytologist
Vol. 131, No. 3 (Nov., 1995), pp. 345-351
Published by: Wiley on behalf of the New Phytologist Trust
Stable URL: http://www.jstor.org/stable/2558900
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Short-Term Exposure to Atmospheric Ammonia does not Affect Low-Temperature Hardening of Winter Wheat
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Abstract

The effect of atmospheric NH3 on low-temperature hardening of winter wheat (Triticum aestivum L. cv. Urban) was investigated. Growth and photosynthesis were stimulated by ammonia exposure. After a 14 d exposure at moderate temperatures (day/night 18.5/16⚬C) total nitrogen content was enhanced by 45% compared with the controls. During that period, water-soluble sugar content was not affected by NH3. After lowering the temperature to 4/3 ⚬C, sugar content of the control plants doubled within 2 d, whereas in the plants exposed to NH3 it increased to a much lesser extent. Total nitrogen content further increased, leading to an 85% higher level in the NH3-exposed plants. Frost hardiness was not affected by atmospheric ammonia. It is concluded that winter wheat is tolerant to high ammonia concentrations, even under unfavourable growth conditions.

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