文献类型： 外文期刊
作者： Zhang, Yingying 1 ; Dai, Taoyu 1 ; Liu, Yahui 1 ; Wang, Jinyan 3 ; Wang, Quanhua 2 ; Zhu, Weimin 1 ;
作者机构： 1.Shanghai Acad Agr Sci, Protected Hort Inst, Shanghai Key Lab Protected Hort Technol, Shanghai 201403, Peoples R China
2.Shanghai Normal Univ, Coll Life Sci, Shanghai 201400, Peoples R China
3.Acad Agr Sci, Innovat Ctr Jiangsu, Nanjing 210014, Peoples R China
关键词： cold stress; endogenous hormone; germination; glycine betaine (GB); tomato (Solanum lycopersicum); seed
期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：6.208； 五年影响因子：6.628 ）
ISSN：
年卷期： 2022 年 23 卷 18 期
页码：
收录情况： SCI
摘要： Cold stress is known to influence tomato growth, development, and yield. In this study, we analyzed the germination of tomato seeds treated with exogenous glycine betaine (GB) at a low temperature (14 degrees C). The results showed that cold stress inhibited tomato seed germination, and pretreatment with exogenous GB reduced this inhibition and enhanced the germination rate (GR), germination index (GI), and viability of tomato seeds at low temperatures. Analysis of gene expression and metabolism revealed that GB positively regulated endogenous hormone gibberellin (GA) content and negatively regulated abscisic acid (ABA) content, while GB reduced the starch content in the seeds by up-regulating the amylase gene expression. Gene expression analysis showed that the key genes (SlSOD, SlPOD, and SlchlAPX) involved in reactive oxygen species (ROS) scavenging systems were up-regulated in GB-pretreated tomato seeds compared with the control. At the same time, levels of malondialdehyde and hydrogen peroxide were significantly lower, while the proline content and peroxidase (POD), superoxide dismutase (SOD), and catalase (CAT) levels were elevated compared with those in the control. These results demonstrate that exogenous GB as a positive regulator effectively alleviated the inhibition of tomato seed germination under cold stress by different signal pathways.
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