Interestingly, an increasing trend of hyperoside, neohesperidin, kaempferol 3-neohesperidoside, genistin, eriocitrin, and luteolin flavonoids was observed in sour orange after 12DDS and 18DDS, whereas the opposite trend was observed in lemon plants ( Figure 3 ).
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LC-MS/MS-based metabolomics approach identified novel antioxidant flavonoids associated with drought tolerance in citrus species.
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These results showed that the aforementioned flavonoids have some significant roles in SO drought tolerance because these flavonoids showed an increasing trend in SO, in response to drought stress, whereas in drought-susceptible lemon, these flavonoids showed a decreasing trend in response to drought stress. 3.5.