MeJA induces chilling tolerance in loquat fruit by regulating proline and γ-aminobutyric acid contents

► The levels of proline and GABA increased during the chilling development in loquat fruit. ► MeJA regulated enzymes involved in proline and GABA metabolism in loquat fruit. ► MeJA alleviated chilling in loquat fruit due to the increased proline and GABA partly.