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SlMYC2 Involved in Methyl Jasmonate-Induced Tomato Fruit Chilling Tolerance.
Journal of Agricultural and Food Chemistry 2018 March 29
MYC2, a basic helix-loop-helix transcription factor, is a master regulator in Jasmonic acid (JA) signaling pathway. However, the functions of SlMYC2 in methyl jasmonate (MeJA)-mediated fruit chilling tolerance are far from being clearly understood. Thus, in the present work, we constructed SlMYC2-silenced tomato fruit by virus-induced gene silencing (VIGS) and investigated the function of SlMYC2 in MeJA-induced tomato fruit chilling tolerance. The results showed that MeJA treatment markedly induced the SlMYC2 expression; increased proline content, lycopene content, and antioxidant enzyme activities, including superoxide dismutase, peroxidase, catalase, and ascorbate peroxidase; inhibited the increase of electrical conductivity and malondialdehyde content; and effectively reduced the chilling injury (CI) incidence and CI index. However, these effects of MeJA treatment were partially counteracted in SlMYC2-silenced tomato fruit, and the CI incidence and CI index in ( SlMYC2-silenced + MeJA)-treated fruit were higher than those in MeJA-treated fruit. Our results indicated that SlMYC2 might be involved in MeJA-induced chilling tolerance, possibly by ameliorating the antioxidant enzyme system of fruit and increasing proline and lycopene levels.
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