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The factors influencing dormancy release in lily bulbs strongly affect commercialization success, but the mechanism of dormancy release is still unclear. Magnetic resonance imaging (MRI) can detect changes in morphology and water status in a living plant bulb and aid in investigating release factors. To evaluate whether MRI could be used to detect intra-bulb metabolic changes during the dormant period in Oriental Lilies (Lilium 'Sorbonne'), a series of MRI and sugar concentration measurements were performed weekly on bulbs stored for 11 weeks at 4°C. The image quality of intra-bulb structure obtained using T (1)-weighted imaging was superior to that obtained using T (2)-weighted imaging and had a higher signal-to-noise ratio (0.97 ± 0.01). Magnetization transfer ratio values for the bud and basal plate declined during the first eight weeks of cold storage (P&gt;0.05), and were well correlated with concentration of soluble sugar in the bud (R (2)=0.95) and basal plate (R (2)=0.93). Thus, MRI can serve as a valuable tool for observation and analysis of dynamic morphological and metabolic changes in vivo during dormancy release. This information is potentially useful as a guide in the improvement of horticultural product quality.

MRI can reveal metabolic changes in lily bulbs in vivo during dormancy release