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Gibberellins pp 220-228 | Cite as

The Role of Gibberellin in the Formation of Onion Bulbs

  • H. Shibaoka

Abstract

Onion plants form bulbs in response to the stimulus of long-day conditions. More than forty years ago, Heath1 reported that the bulb is formed by the swelling of leaf-sheath cells and that cell division is not involved in this phenomenon. Under short-day conditions, leaf-sheath cells elongate longitudinally, whereas under long-day conditions they expand laterally. This means that leaf-sheath cells respond to a long-day stimulus by a change in direction of cell expansion. The direction of cell expansion depends largely on the orientation of the cellulose microfibrils in the cell wall.2 The orientation of cellulose microfibrils, in turn, is considered to be controlled by cortical microtubules.3 Since changes in the direction of cell expansion are part of bulb development, the cortical microtubules may be involved in the regulation of this development. Therefore, we examined the behavior of cortical microtubules in the leaf-sheath cells of onion plants during bulb development. We have reported previously that the suppression by gibberellin A3 (GA3) of the lateral expansion of cells in azuki bean epicotyls is correlated with an increased number of transversely oriented cortical microtubules.4 This is followed by the accumulation of transversely oriented cellulose microfibrils in the cell wa11.5 Thus, in the work reported here, we examined the effects of GA3 on the arrangement of microtubules during the development of onion bulbs.

Keywords

Leaf Sheath Lateral Expansion Cellulose Microfibril Cortical Microtubule Cell Axis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Heath OVS. Formative effects of environmental factors as exemplified in the development of the onion plant. Nature. 1945; 155:623–626.CrossRefGoogle Scholar
  2. 2.
    Preston RD. The physical biology of plant cell walls. London: Chapman and Hall, 1974: pp. 385–409.Google Scholar
  3. 3.
    Robinson DG, Quader H. The microtubule-microfibril syndrome. In: Lloyd CW (ed) The cytoskeleton in plant growth and development. London: Academic Press, 1982: pp. 109–126.Google Scholar
  4. 4.
    Shibaoka H. Involvement of wall microtubules in gibberellin promotion and kinetin inhibition of stem elongation. Plant Cell Physiol. 1974; 15:255–263.Google Scholar
  5. 5.
    Takeda K, Shibaoka H. Effects of gibberellin and colchicine on microfibril arrangement in epidermal cell walls of Vigna angularis Ohwi et Ohashi epicotyls. Planta. 1981; 151:393–398.CrossRefGoogle Scholar
  6. 6.
    Mita T, Shibaoka H. Changes in microtubules in onion leaf sheath cells during bulb development. Plant Cell Physiol. 1983; 24:109–117.Google Scholar
  7. 7.
    Heath OVS, Holdsworth M. Morphogenic factors as exemplified by the onion plant. Soc Exp Biol Symp. 1948; 2:326–350.Google Scholar
  8. 8.
    Sumida S, Ueda M. Effect of O-ethyl-O-(3-methyl-6-nitrophenyl)-N-secbutylphosphorothioamidate (S-2846), an experimental herbicide, on mitosis in Allium cepa. Plant Cell Physiol. 1976; 17:1351–1354.Google Scholar
  9. 9.
    Mita T, Shibaoka H. Effects of root excision on swelling of leaf sheath cells and on the arrangement of cortical microtubules in onion seedlings. Plant Cell Physiol. 1984; 25:1521–1529.Google Scholar
  10. 10.
    Mita T, Katsumi M. Gibberellin control of microtubule arrangement in the mesocotyl epidermal cells of the d5 mutant of Zea mays L. Plant Cell Physiol. 1986; 27:651–659.Google Scholar
  11. 11.
    Akashi T, Shibaoka H. Effects of gibberellin on the arrangement and the cold stability of cortical microtubules in epidermal cells of pea internodes. Plant Cell Physiol. 1987; 28:339–348.Google Scholar
  12. 12.
    Izumi K, Yamaguchi I, Wada A, et al. Effects of a new plant growth retardant (E)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)-1-penten-3-ol (S-3307) on the growth and gibberellin content of rice plants. Plant Cell Physiol. 1984; 25:611–617.Google Scholar
  13. 13.
    Mita T, Shibaoka H. Effects of S-3307, an inhibitor of gibberellin biosynthesis, on swelling of leaf sheath cells and on the arrangement of cortical microtubules in onion seedlings. Plant Cell Physiol. 1984; 25:1531–1539.Google Scholar
  14. 14.
    Mita T, Shibaoka H. Gibberellin stabilizes microtubules in onion leaf sheath cells. Protoplasma. 1984; 119:100–109.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag New York Inc. 1991

Authors and Affiliations

  • H. Shibaoka

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