Exogenous melatonin delays leaves senescence and enhances saline and alkaline stress tolerance in grape seedlings.

In conclusion, the MDA content was significantly higher after saline and alkaline treatment, indicating water loss and osmotic imbalance in grape seedlings under saline and alkaline conditions. As shown in Figures 5c & 5d , the H 2 O 2 content in the leaves and roots of grape seedlings showed an increasing trend with the continuous increase of saline and alkaline stress time.

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Effect of exogenous melatonin on photosynthetic pigments of grape seedlings under saline and alkaline stress As can be seen in Figure 3 , the chlorophyll content of grape seedlings showed an overall trend of increasing and then decreasing with increasing treatment time.

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Effect of exogenous melatonin on root vigor of grape seedlings under saline and alkaline stress As can be seen from Figure 4 , with the continuous increase of the stress time, the root vigor of grape seedlings showed a trend of decreasing and then increasing.

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