Tolerance to frost and ice encasement in cultivars of timothy and perennial ryegrass during winter
作者： M. Höglind , A. K. Bakken , M. Jørgensen , L. Østrem
DOI: 10.1111/J.1365-2494.2010.00762.X
关键词:
摘要: Ice encasement causes major winter damage in grasslands coastal areas of Northern Scandinavia and may also affect grass performance a future changing climate. Changes ice-encasement tolerance (LD50), frost (LT50) water-soluble carbohydrate (WSC) content were investigated different cultivars timothy perennial ryegrass sampled at three sites with contrasting conditions. Timothy endured ice for 40 d more than (maximum LD50 63 vs. 20 d), cultivar originating from 69� N tolerated significantly longer periods 59� N. A similar relationship between origin was observed ryegrass. The higher compared seemed to be associated lower rate change WSC during encasement, but no apparent found the start plant survival ice. significant linear LT50 plants field. differing decline species indicated that is resistant dehardening under This study contributes data functional relationships needed develop models winter.
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