期刊
SCIENTIA HORTICULTURAE
卷 288, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scienta.2021.110406
关键词
SlMYC2; Methyl jasmonate; Chilling tolerance; Ascorbate-glutathione cycle; SlICE-SlCBF-SlCOR signaling pathway; Tomato fruits
类别
资金
- National Natural Science Foundation of China [31772024]
- Key Project of the Natural Science Foun-dation of Shandong Province [ZR2020KC011]
The study showed that MeJA treatment improved chilling tolerance in tomato fruit by reducing oxidative stress and enhancing the accumulation of AsA and GSH. Additionally, SlMYC2 was found to be crucial in regulating the ASA-GSH cycle and ICC signaling pathway during cold tolerance.
This study parsed the mechanism of SlMYC2 involving methyl jasmonate (MeJA)-mediated tomato fruit chilling tolerance. The data indicated that the application of MeJA significantly prevented chilling injury (CI) and inhibited the accumulation of hydrogen peroxide (H2O2) and superoxide anions (O-2(center dot-)) in tomato fruit during cold storage. The accumulation of endogenous ascorbate (AsA) and glutathione (GSH) contents in fruit were enhanced by MeJA treatment resulting from increasing activities of enzymes related to AsA-GSH cycle. Meanwhile, the MeJA-treated fruit exhibited significantly higher expression levels of C-repeat-binding factor 1 (SlCBF1), cold regulated gene (SlCOR413) and inducer of SlCBF expression (SlICE1 and SlICEa), which belong to the SlICESlCBF-SlCOR (ICC) signaling pathway. However, the effects of MeJA were inhibited by the silence of SlMYC2. The expression levels of SlCBF1, SlCOR413, SlICE1 and SlICEa were reduced in SlMYC2-silenced fruits, and there was no significant difference in CI index and the indexes related to AsA-GSH cycle between (SlMYC2-silenced+MeJA)-treated fruit and control during most storage periods. In addition, correlation analysis indicated that the indexes involved in AsA-GSH cycle and ICC signaling pathway were closely related to the transcription of SlMYC2. Therefore, these results illustrated that SlMYC2 was involved in the regulation of ASA-GSH cycle and ICC signaling pathway mediated by MeJA during the cold tolerance of tomato fruit.
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