Optimizing tobacco growth under low temperature: Glutamine enhancing tolerance by coordinating carbon and nitrogen metabolism

文献类型： 外文期刊

第一作者： Lin, Zhihui

作者： Lin, Zhihui;Chen, Tao;Chen, Chengliang;Yin, Changlin;Yu, Keke;Song, Wenjing;Zongguo, Xinan;Yu, Zhiyong;Zhang, Yali;Gao, Zhengxu

作者机构：

关键词： Tobacco; Glutamine; Cold stress; Carbon and nitrogen metabolism; Auxin

期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：6.2； 五年影响因子：6.2 ）

ISSN： 0926-6690

年卷期： 2025 年 225 卷

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收录情况： SCI

摘要： Temperature is one of the major stresses for tobacco growth due to its sensitivity to low temperature. Optimizing nitrogen (N) supply and acclimatization of N metabolism are essential prerequisite for the performance of plants when facing low temperature. In this study, we aimed to explore the influence of exogenous glutamine (Gln) under low temperature on growth, N metabolism and photosynthetic characteristics of tobacco. Cold stress resulted in retarded plant growth mainly contributing to inhibited growth of leaf and root. However, Gln application alleviated cold stress and significantly increased leaf fresh weight by 44.8 % and root fresh weight by 38.4 %, respectively. Similarly, Gln application recovered N content under low-temperature treatment to the similar level as that under the control. Increased N content by Gln application resulted from upregulated transcripts of N transporters and assimilation genes within tobacco plants. In addition, photosynthetic capacity was also increased by Gln application compared with low-temperature treatment alone, in which Gln significantly boosted the photosynthetic activity (24.3 %) and increased the leaf area (24.8 %) under cold stress. Intriguingly, enhanced auxin content was observed in leaves and roots after Gln application, paralleling with higher transcripts of auxin synthesis and polar transport genes and higher [3H]IAA activity under Gln treatment. Furthermore, exogenous addition of analog auxin under low temperature restored leaf area, photosynthesis and growth of lateral root to a similar level as that under the control; in contrast, addition of auxin transport inhibitor under Gln-application treatment inhibited growth of leaf and root. We demonstrated that Gln addition improved growth of tobacco plants and thus facilitated coordination of carbon and N metabolism in which changing auxin distribution within plants was involved in their balance. In conclusion, the current findings imply that Gln application mitigates cold stress and enhances tobacco growth and development in low temperature.

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