Barley is described to mostly use sucrose for night carbon requirements. To understand how the transient carbon is accumulated and utilized in response to cold, barley plants were grown in a combination of cold days and/or nights. Both daytime and night cold reduced growth. Sucrose was the main carbohydrate supplying growth at night, representing 50-60% of the carbon consumed. Under warm days and nights, starch was the second contributor with 26% and malate the third with 15%. Under cold nights, the contribution of starch was severely reduced, due to an inhibition of its synthesis, including under warm days, and malate was the second contributor to C requirements with 24-28% of the total amount of carbon consumed. We propose that malate plays a critical role as an alternative carbon source to sucrose and starch in barley. Hexoses, malate, and sucrose mobilization and starch accumulation were affected in barley elf3 clock mutants, suggesting a clock regulation of their metabolism, without affecting growth and photosynthesis however. Altogether, our data suggest that the mobilization of sucrose and malate and/or barley growth machinery are sensitive to cold.

中文翻译：

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大麦的寒冷夜晚会影响水槽和源组织的日增型生长和瞬时储备。

据描述，大麦主要使用蔗糖满足夜间碳需求。为了了解瞬态碳如何响应寒冷而积累和利用，大麦植物在寒冷的白天和/或夜晚组合生长。白天和晚上的寒冷都会减少生长。蔗糖是夜间主要的碳水化合物供应增长，占碳消耗量的50-60％。在昼夜温暖的情况下，淀粉占第二位，占26％，苹果酸占第三位，占15％。在寒冷的夜晚，由于抑制了淀粉的合成（包括在温暖的天气下），淀粉的贡献大大降低了，而苹果酸则是碳需求的第二大贡献者，占总碳消耗量的24-28％。我们建议苹果酸在大麦中作为蔗糖和淀粉的替代碳源起着至关重要的作用。己糖，苹果酸，大麦elf3时钟突变体中蔗糖的动员和淀粉积累受到影响，这表明它们的代谢具有时钟调节作用，但不影响生长和光合作用。总体而言，我们的数据表明，蔗糖和苹果酸和/或大麦生长机制的动员对感冒敏感。