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Physiological and Transcriptomic Mechanisms Underlying Vitamin C-Mediated Cold Stress Tolerance in Grafted Cucumber

文献类型： 外文期刊

作者： Yu, Panpan 1 ; Wang, Junkai 1 ; Zhang, Xuyang 1 ; Weng, Zhenglong 1 ; Huo, Kaisen 3 ; Yi, Qiuxia 1 ; Wu, Chenxi 1 ; Kumar, Sunjeet 1 ; Gao, Hao 1 ; Fu, Lin 1 ; Chen, Yanli 1 ; Zhu, Guopeng 1 ;

作者机构： 1.Hainan Univ, Sanya Inst Breeding & Multiplicat, Sch Breeding & Multiplicat, Sanya 572025, Peoples R China

2.Hainan Univ, Trop Agr & Forestry Coll, Key Lab Qual Regulat Trop Hort Crops Hainan Prov, Haikou 570228, Peoples R China

3.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Haikou 571101, Peoples R China

关键词： grafted cucumber seedlings; low-temperature stress; vitamin C; transcriptome analysis

期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）

ISSN： 2223-7747

年卷期： 2025 年 14 卷 15 期

页码：

收录情况： SCI

摘要： Cucumbers (Cucumis sativus L.) are highly sensitive to cold, but grafting onto cold-tolerant rootstocks can enhance their low-temperature resilience. This study investigates the physiological and molecular mechanisms by which exogenous vitamin C (Vc) mitigates cold stress in grafted cucumber seedlings. Using cucumber 'Chiyu 505' as the scion and pumpkin 'Chuangfan No.1' as the rootstock, seedlings were grafted using the whip grafting method. In the third true leaf expansion stage, seedlings were foliar sprayed with Vc at concentrations of 50, 100, 150, and 200 mg L-1. Three days after initial spraying, seedlings were subjected to cold stress (8 degrees C) for 3 days, with continued spraying. After that, morphological and physiological parameters were assessed. Results showed that 150 mg L-1 Vc treatment was most impactive, significantly reducing the cold damage index while increasing the root-to-shoot ratio, root vitality, chlorophyll content, and activities of antioxidant enzymes (SOD, POD, CAT). Moreover, this treatment enhanced levels of soluble sugars, soluble proteins, and proline compared to control. However, 200 mg L-1 treatment elevated malondialdehyde (MDA) content, indicating potential oxidative stress. For transcriptomic analysis, leaves from the 150 mg L-1 Vc and CK treatments were sampled at 0, 1, 2, and 3 days of cold stress. Differential gene expression revealed that genes associated with photosynthesis (LHCA1), stress signal transduction (MYC2-1, MYC2-2, WRKY22, WRKY2), and antioxidant defense (SOD-1, SOD-2) were initially up-regulated and subsequently down-regulated, as validated by qRT-PCR. Overall, we found that the application of 150 mg L-1 Vc enhanced cold tolerance in grafted cucumber seedlings by modulating gene expression networks related to photosynthesis, stress response, and the antioxidant defense system. This study provides a way for developing Vc biostimulants to enhance cold tolerance in grafted cucumbers, improving sustainable cultivation in low-temperature regions.

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