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Survival and Cold Hardiness of Winter Wheats During Partial and Total Ice Immersion¹

Seedlings of winter wheats (Triticum aestivum L.) of contrasting cold hardiness were only slightly damaged by partial immersion in ice at –1C for up to 6 weeks, whereas during 1 week total ice immersion survival was reduced considerably. Survival varied with the cultivar, and increased in each cultivar with increasing period of cold hardening before ice exposure. The cold hardiness of plants thawed after 1 week partial ice immersion was similar to cold hardiness of nonimmersed plants, while hardiness of plants surviving after total ice immersion was reduced by 8 to 12 C. Plants with or without ice treatments showed greatest hardiness after 7 weeks cold hardening. Survival was reduced more rapidly with decreasing ice temperature, but cultivars with the greatest resistance to total ice immersion at –1C were not superior in their survival at –7 C. Thawing of the ice during the course of protracted total ice immersion at –1 and –3 C increased the survival of the immersed plants.

Key Words: Cold acclimation • Fost resistance • Controlled environments

² Research scientist, Chem. and Biol. Res. Inst., Agric. Can., Ottawa, Ont. KIA OC6.

Received for publication October 7, 1974.

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