Dihydroporphyrin iron (III) enhances low temperature tolerance by increasing carbon and nitrogen metabolism in Andrographis paniculata

文献类型： 外文期刊

第一作者： Jian, Shao-Fen

作者： Jian, Shao-Fen;Huang, Yan-Fen;Zhong, Chu;Jian, Shao-Fen;Huang, Yan-Fen;Zhong, Chu;Jian, Shao-Fen;Huang, Yan-Fen;Zhong, Chu;Chen, Dong-Liang

作者机构：

关键词： dihydroporphyrin iron; low temperature stress; carbon metabolism; Andrographis paniculata; antioxidant

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：4.8； 五年影响因子：5.7 ）

ISSN： 1664-462X

年卷期： 2025 年 15 卷

页码：

收录情况： SCI

摘要： Dihydroporphyrin iron (DH-Fe) is a novel plant growth regulator that plays significant roles in plant stress resistance. We found that Andrographis paniculata is extremely sensitive to low temperature (LT) with a threshold of 25 degrees C. To evaluate whether and how DH-Fe alleviates LT stress in A. paniculata, different DH-Fe concentrations (0, 10, 20, and 40 mu gL-1) were applied to estimate its effects on C and N metabolism and antioxidative capacity in A. paniculata grown under 20 degrees C. Pre-treatment of DH-Fe alleviated LT-induced anthocyanin accumulation. Additionally, it relieved LT-induced oxidative stress by increasing the activity of catalase (CAT). DH-Fe reduced the contents of sucrose, soluble sugar and starch and the activities of sucrose synthase (SS) and hexokinase (HXK), but stimulated the activities of sucrose phosphate synthase (SPS), glucose-6-phosphate dehydrogenase (G6PDH), glyceraldehyde 3-phosphate dehydrogenase (GAPDH), phosphoenolpyruvate carboxylase (PEPC), isocitrate dehydrogenase (ICDH), and malic enzyme (ME). Soluble protein and proline contents were decreased by DH-Fe, while total N and free amino acids contents were increased, accompanying by the enhancement of the activities of glutamine synthase (GS), glutamic-oxaloacetic transaminase (GOT) and glutamic-pyruvic transaminase (GTP). Simultaneously, the content of andrographolide, the bioactive ingredient of A. paniculata, was remarkably declined. These results indicated that DH-Fe alleviates LT-induced oxidation by increasing sugar catabolism and allocating C metabolic flow to N assimilation. A concentration of 20 mu gL-1 DH-Fe is recommended to be used to enhance LT tolerance in A. paniculata. Our results update the understanding of the mechanism of plant cold tolerance and provide new ideas for relieving plant cold damage.

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