Abstract
Daylily (Hemerocallis citrina) bud is a functional vegetable rich in various nutrients and many bioactive compounds. However, fresh daylily buds are very susceptible to senescence and quality deterioration occurs rapidly after harvest. The effects of nordihydroguaiaretic acid (NDGA) on postharvest quality, reactive oxygen species (ROS) metabolism and phytohormone alterations in daylily buds were investigated. The results showed that NDGA treatments delayed the loss of overall quality, and alleviated yellowing and disaggregation. The NDGA treatment inhibited the production of hydrogen peroxide and malondialdehyde, enhanced activities of ROS-scavenging enzymes and delayed the decrease in total antioxidant capacity. The biosynthesis of abscisic acid was decreased, while the contents of indole-3-acetic acid and brassinosteroids were increased by NDGA treatment, and therefore equilibrium involving several phytohormones was altered by NDGA. Transcriptomic profiling of genes associated with the signal transduction pathways of the main phytohormones was performed to reveal alterations in the regulation of postharvest senescence of daylily buds in response to NDGA. Collectively, NDGA treatment is a potential approach for the preservation of fresh daylily flower buds.
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