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The physiological functions of sphingolipids in animals have been intensively studied, while less attention has been paid to their roles in plants. Here, we reveal the involvement of  sphingolipid delta8 desaturase (SlSLD ) in the chilling resistance of tomato ( Solanum lycopersicum  cv. Micro-Tom). We used the virus-induced gene silencing (VIGS) approach to knock-down  SlSLD  expression in tomato leaves, and then evaluated chilling resistance. Changes in leaf cell structure under a chilling treatment were observed by transmission electron microscopy. In control plants,  SlSLD  was highly expressed in the fruit and leaves in response to a chilling treatment. The degree of chilling damage was greater in  SlSLD -silenced plants than in control plants, indicating that  SlSLD  knock-down significantly reduced the chilling resistance of tomato. Compared with control plants,  SlSLD -silenced plants showed higher relative electrolytic leakage and malondialdehyde content, and lower superoxide dismutase and peroxidase activities after a chilling treatment. Chilling severely damaged the chloroplasts in  SlSLD -silenced plants, resulting in the disruption of chloroplast membranes, swelling of thylakoids, and reduced granal stacking. Together, these results show that  SlSLD  is crucial for chilling resistance in tomato.

The sphingolipid biosynthetic enzyme Sphingolipid delta8 desaturase is important for chilling resistance of tomato