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Morphological structure and water status in bulbs during

Morphological structure and water status in bulbs during their transition from dormancy to active growth: Visualization by NMR imaging. Rina Kamenetsky Hanita Zemah Annette van der Toorn Haim D. Rabinowitch Henk van As Peter Bendel accepted by J. exp. Bot.

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Morphological structure and water status in bulbs during

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  1. Morphological structure and water status in bulbs during their transition from dormancy to active growth: Visualization by NMR imaging Rina Kamenetsky Hanita Zemah Annette van der Toorn Haim D. Rabinowitch Henk van As Peter Bendel accepted by J. exp. Bot.

  2. Tulip bulbs (Tulipa gesneriana L.) • World wide use of tulip as ornamental plant • Needs a cold period during dormancy to facilitate normal development and flowering • Fundamental knowledge about bulb dormancy and growth is limited

  3. Purpose of the project: To determine if significant differences in water status between bulbs stored at 4 oC and at 20 oC can be observed using MRI. Mainly using: • Visible morphological changes in the images • Proton density determination • R2 measurements (1/T2) • ADC measurements (reflecting proton mobility) • R1 measurements (1/T1)

  4. Morphological MR image of tulip bulb scales bud basal plate 1 cm Resolution 350 x 350 x 700 mm

  5. Single parameter images of the tulip bulb Amp of R1 Amp of R2 Amp of ADC 0.033 0.025 0.033 0 0 0 2.5 30 2.5e-9 0 0 0 R1 image R2 image ADC image

  6. 7 20 oC 4o C 30 20 oC 4 oC amplitude Time- dependent change in R2 for two bulbs R2 Time- dependent change in amplitude for two bulbs 0 0 start 2 weeks 4 weeks 8 weeks 12weeks

  7. Planted bulbs (10 days after planting) 4 oC 20 oC

  8. Conclusions • MR parameters such as R2 and ADC can be used to observe differences between chilled and non-chilled bulbs • MRI needs to be combined with histology to understand the observed changes in water status • The majority of changes in water status take place between 2 and 8 weeks after storage

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