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VaSUS2 confers cold tolerance in transgenic tomato and Arabidopsis by regulation of sucrose metabolism and ROS homeostasis

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VaSUS2 enhances cold tolerance of transgenic tomato and Arabidopsis by regulating sucrose metabolism and improving antioxidant enzymes activity.

Abstract

Sucrose synthetase (SUS) is a key enzyme of sugar metabolism, and plays an important role in response to abiotic stress in plant. However, the function of VaSUS2 remains unknown in cold tolerance. Here, the cloning and functional characterization of the plasma membrane-localized VaSUS2 gene isolated from Vitis amurensis was studied. The transcript level of VaSUS2 was up-regulated under cold stress in Vitis amurensis. Heterologous expression of VaSUS2 in tomato increased SUS activity, which promoted the accumulation of glucose and fructose under cold treatment. The transgenic tomato and Arabidopsis exhibited higher levels of antioxidant enzymes activity, lower relative electrolyte leakage (REL), malondialdehyde (MDA) and hydrogen peroxide (H2O2) content compared to wild type under cold stress. Importantly, the ability of scavenging reactive oxygen species (ROS) in transgenic plants was significantly improved. Moreover, yeast two-hybrid (Y2H) indicated that VaSnRK1 might be a potential interaction protein of VaSUS2. qRT-PCR showed that sucrose metabolism-related genes SlSUS, SlSPS and SlINV were significantly up-regulated in transgenic tomatoes. Meanwhile, the expression levels of antioxidant enzyme genes and cold-related genes CBF1, COR47 and ICE1 were up-regulated in transgenic plants. Taken together, these results suggested that VaSUS2 was involved in cold tolerance by increasing the levels of soluble sugars, improving the activity of antioxidant enzymes, and up-regulating the expression of cold-related genes in transgenic tomatoes and Arabidopsis.

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The data included in this article are available from the corresponding author on reasonable request.

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Funding

This work was supported by Education science and technology innovation project of Gansu Province (GSSYLXM-02), Key Project of Natural Science Foundation of Gansu Province (22JR5RA831), FuXi Foundation of Gansu Agricultural University (No. Ganfx-03J02) and “Innovation Star” Project for outstanding graduate students in Gansu Province (2022CXZXB-035).

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BHC and JM designed the experiments and revised the manuscript. YML performed the analyses and wrote the manuscript. GPL, GJN, SXL and WFM participated in the determination of physiological-biochemical indicators. ZHM participated in the revision of the manuscript. All authors read and approved the manuscript.

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Correspondence to Juan Mao or Baihong Chen.

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The authors declare no conflict of interest.

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Communicated by Ying-Tang Lu.

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Li, Y., Liang, G., Nai, G. et al. VaSUS2 confers cold tolerance in transgenic tomato and Arabidopsis by regulation of sucrose metabolism and ROS homeostasis. Plant Cell Rep 42, 505–520 (2023). https://doi.org/10.1007/s00299-022-02972-w

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  • DOI: https://doi.org/10.1007/s00299-022-02972-w

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