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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

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.


Tulip bulbs tulipa gesneriana l
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


Purpose of the project
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)


Morphological MR image of tulip bulb

scales

bud

basal plate

1 cm

Resolution 350 x 350 x 700 mm


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


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



Conclusions
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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