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首页> 外文期刊>European Journal of Agronomy >The freezing characteristics of wheat at ear emergence.
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The freezing characteristics of wheat at ear emergence.

机译：穗出时小麦的冷冻特性。

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摘要

Wheat is occasionally exposed to freezing temperatures during ear emergence and can suffer severe frost damage. Few studies have attempted to understand the characteristics of freezing and frost damage to wheat during late development stages. It was clearly shown that wheat appears to have an inherent frost resistance to temperatures down to -5 degrees C but is extensively damaged below this temperature. Acclimation, whilst increasing the frost resistance of winter wheat in a vegetative state was incapable of increasing frost resistance of plants at ear emergence. It is proposed that the ability to upregulate frost resistance is lost once vernalisation requirement is fulfilled. Culms and ears of wheat were able to escape frost damage at temperatures below -5 degrees C by supercooling even to as low as -15 degrees C and evidence collected by infrared thermography suggested that individual culms on a plant froze as independent units during freezing with little or no cross ice-nucleation strategies to protect wheat from frost damage in the field appear to revolve around avoiding ice nucleation..
机译：小麦在出耳期间偶尔会暴露于冰冻温度下，并可能遭受严重的霜冻破坏。很少有研究试图了解发育后期对小麦的冻害和霜冻损害的特征。清楚地表明，小麦对低至-5摄氏度的温度似乎具有固有的抗冻性，但在此温度以下会遭到广泛破坏。在增加营养状态下冬小麦的抗霜性的同时，驯化并不能在耳朵出苗时提高植物的抗霜性。建议一旦满足春化要求，就失去了上调抗冻性的能力。小麦的茎和耳朵能够通过在-5°C以下的温度过冷甚至至-15°C的低温进行冷却，从而避免霜冻损害，并且红外热成像技术收集的证据表明，植物的单个茎在冷冻期间很少冻结为独立的单位或没有跨冰成核策略来保护小麦免受田间的霜冻损害，似乎没有绕过冰成核。

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