Exogenous Spermidine Alleviated Low-Temperature Damage by Affecting Polyamine Metabolism and Antioxidant Levels in Apples
文献类型： 外文期刊
作者： He, Meiqi 1 ; Zhou, Jia 1 ; Lyu, Deguo 1 ; Xu, Gongxun 2 ; Qin, Sijun 1 ;
作者机构： 1.Shenyang Agr Univ, Coll Hort, Key Lab Fruit Qual Dev & Regulat Liaoning Prov, Shenyang 110866, Peoples R China
2.Chinese Acad Agr Sci, Res Inst Pomol, Xingcheng 125100, Peoples R China
关键词： spermidine; cold resistance; apple; antioxidant enzymes; polyamine metabolism
期刊名称：PLANTS-BASEL （ 影响因子：4.5； 五年影响因子：4.8 ）
ISSN： 2223-7747
年卷期： 2024 年 13 卷 8 期
页码：
收录情况： SCI
摘要：
Low-temperature stress significantly limits the growth, development, and geographical distribution of apple cultivation. Spermidine (Spd), a known plant growth regulator, plays a vital role in the plant's response to abiotic stress. Yet, the mechanisms by which exogenous Spd enhances cold resistance in apples remain poorly understood. Therefore, the present study analyzed the effects of exogenous Spd on antioxidant enzyme activity, polyamine metabolism, and related gene expression levels of 1-year-old apple branches under low-temperature stress. Treatment with exogenous Spd was found to stabilize branch tissue biofilms and significantly reduce the levels of reactive oxygen species by elevating proline content and boosting the activity of antioxidants such as superoxide dismutase. It also upregulated the activities of arginine decarboxylase, S-adenosylmethionine decarboxylase, and spermidine synthase and the expression levels of MdADC1, MdSAMDC1, and MdSPDS1 under low-temperature stress and led to the accumulation of large amounts of Spd and spermine. Moreover, compared with the 2 mmol
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