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Effects of exogenous glycine betaine on growth and development of tomato seedlings under cold stress

文献类型： 外文期刊

作者： Dai, Taoyu 1 ; Ban, Songtao 2 ; Han, Liyuan 1 ; Li, Linyi 2 ; Zhang, Yingying 1 ; Zhang, Yuechen 3 ; Zhu, Weimin 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Protected Hort Inst, Shanghai Key Lab Protected Hort Technol, Shanghai, Peoples R China

2.Agr Informat Inst Sci & Technol, Shanghai Acad Agr Sci, Key Lab Intelligent Agr Technol Yangtze River Del, Minist Agr & Rural Affairs, Shanghai, Peoples R China

3.Hebei Agr Univ, Coll Agron, State Key Lab North China Crop Improvement & Regu, Key Lab Crop Growth Regulat Hebei Prov, Baoding, Hebei, Peoples R China

关键词： cold stress; tomato seedlings; glycine betaine; hyperspectral phenotyping; cryoprotectant

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.6； 五年影响因子：6.8 ）

ISSN： 1664-462X

年卷期： 2024 年 15 卷

页码：

收录情况： SCI

摘要： Low temperature is a type of abiotic stress affecting the tomato (Solanum lycopersicum) growth. Understanding the mechanisms and utilization of exogenous substances underlying plant tolerance to cold stress would lay the foundation for improving temperature resilience in this important crop. Our study is aiming to investigate the effect of exogenous glycine betaine (GB) on tomato seedlings to increase tolerance to low temperatures. By treating tomato seedlings with exogenous GB under low temperature stress, we found that 30 mmol/L exogenous GB can significantly improve the cold tolerance of tomato seedlings. Exogenous GB can influence the enzyme activity of antioxidant defense system and ROS levels in tomato leaves. The seedlings with GB treatment presented higher Fv/Fm value and photochemical activity under cold stress compared with the control. Moreover, analysis of high-throughput plant phenotyping of tomato seedlings also supported that exogenous GB can protect the photosynthetic system of tomato seedlings under cold stress. In addition, we proved that exogenous GB significantly increased the content of endogenous abscisic acid (ABA) and decreased endogenous gibberellin (GA) levels, which protected tomatoes from low temperatures. Meanwhile, transcriptional analysis showed that GB regulated the expression of genes involved in antioxidant capacity, calcium signaling, photosynthesis activity, energy metabolism-related and low temperature pathway-related genes in tomato plants. In conclusion, our findings indicated that exogenous GB, as a cryoprotectant, can enhance plant tolerance to low temperature by improving the antioxidant system, photosynthetic system, hormone signaling, and cold response pathway and so on.

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