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首页> 外文期刊>Journal of Plant Physiology >Light-induced frost tolerance differs in winter and spring wheat plants
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Light-induced frost tolerance differs in winter and spring wheat plants

机译：冬小麦和春小麦的光诱导抗冻性不同

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It has been shown that the frost hardening of wheat plants at low temperature under low light conditions is much less effective than under normal light conditions. The aim of the present work was to uncover the biochemical changes responsible for the enhanced freezing tolerance of wheat plants with different levels of frost tolerance when frost hardening takes place in the light. Ten-day-old plants grown at 20/18 pC were cold hardened at 5 pC for 12 d under normal (250 omol m2 s1) or low light (20 omol m2 s1) conditions. Some of the plants were kept at non-hardening temperature for 12 d at elevated light (500 omol m2 s1). Changes in the polyamine contents during low temperature hardening showed marked light dependence; however, these changes differed in the spring and winter wheat plants. In the winter wheat Mv Emese, the putrescine, spermidine and cadaverine contents showed a substantial increase at low temperature under normal light conditions, while in the spring wheat Nadro, only the levels of spermidine and spermine increased under these conditions. Low temperature hardening induced a similar level of glutathione S-transferase activity in both Mv Emese and Nadro. However, this induction was more pronounced under normal light than under low light. In the next step, three winter wheat varieties with a high level of frost tolerance and three spring varieties with a low level of frost tolerance were tested for freezing tolerance after being kept at normal, non-hardening temperature at elevated light. The results showed that, although elevated light increased the survival rate of spring varieties as well, even after this hardening process winter varieties had higher frost tolerance than spring varieties. This suggests that there is a correlation between the freezing tolerance induced by low temperature and that induced by light at non-hardening temperature.
机译：已经表明，在弱光条件下，低温下小麦植株的霜冻硬化效果远不如正常光照条件下有效。本工作的目的是揭示在光照条件下进行霜冻硬化后，具有不同水平的霜冻耐受性的小麦植物的耐冻性增强的生物化学变化。在正常（250 omol m2 s1）或弱光（20 omol m2 s1）条件下，将以20/18 pC生长的10天龄植物在5 pC下冷硬化12 d。一些植物在高光下（500 omol m2 s1）在非硬化温度下保持12天。低温硬化过程中多胺含量的变化显示出显着的光依赖性。但是，这些变化在春季和冬季小麦植株中有所不同。在冬季小麦Mv Emese中，在正常光照条件下，低温下的腐胺，亚精胺和尸胺含量显着增加，而在春季Nadro小麦中，这些条件下仅亚精胺和亚精胺的含量增加。低温硬化在Mv Emese和Nadro中诱导了相似水平的谷胱甘肽S-转移酶活性。但是，这种感应在正常光线下比在弱光下更为明显。在下一步中，将三个耐寒性高的冬小麦品种和三个耐寒性低的春小麦品种在升高的光照下保持在正常的非硬化温度下后，测试其耐冻性。结果表明，尽管强光也能提高春季品种的成活率，但即使经过这种硬化处理，冬季品种的抗冻性也高于春季品种。这表明低温引起的耐冷冻性与非硬化温度下的光引起的耐冷冻性之间存在相关性。

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