Development-specific association of amyloplasts with microtubules in scale cells of Narcissus tazetta

S. Zaffryar, B. Zimerman, M. Abu-Abied, E. Belausov, G. Lurya, A. Vainstein, R. Kamenetsky, E. Sadot*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Narcissus tazetta is one of the major geophyte crops worldwide, but little is known about its cell biology. The narcissus storage organ was studied by monitoring scale cell biology during the growth stage and dormancy, and it was found that amyloplasts gradually increased in size and reached a maximum at dormancy. In parallel, microtubules changed their organisation: during the growth phase (February to March) they were oblique; during April and May, microtubules formed a network with round "holes"; by late June and the beginning of July, when dormancy started, they were organised in parallel arrays. The holes formed in the microtubule array corresponded to amyloplasts. A closer look showed that during a short time window, while the plants were preparing for dormancy, the microtubules surrounded the amyloplasts. In vitro reconfirmation of this phenomenon was obtained when fluorescent bovine brain microtubules enwrapped isolated amyloplasts that had been purified between April and July but not those purified between January and March. Interestingly, protease treatment of amyloplasts did not completely prevent binding of microtubules, which suggests the existence of a protease-resistant factor that docks microtubules to the outer membrane of amyloplasts.

Original languageAmerican English
Pages (from-to)153-163
Number of pages11
JournalProtoplasma
Volume230
Issue number3-4
DOIs
StatePublished - Apr 2007

Keywords

  • Amyloplast
  • Dormancy
  • Microtubule
  • Narcissus tazetta

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