Axillary bud development in pineapple nodal segments correlates with changes on cell cycle gene expression, hormone level, and sucrose and glutamate contents

  • Beatriz M. Souza
  • Jeanne B. Molfetta-Machado
  • Luciano Freschi
  • Antonio Figueira
  • Eduardo Purgatto
  • Marcos S. Buckeridge
  • Marie-Anne Van Sluys
  • Helenice Mercier
Developmental Biology

Abstract

During the process of lateral organ development after plant decapitation, cell division and differentiation occur in a balanced manner initiated by specific signaling, which triggers the reentrance into the cell cycle. Here, we investigated short-term variations in the content of some endogenous signals, such as auxin, cytokinins (Cks), and other mitogenic stimuli (sucrose and glutamate), which are likely correlated with the cell cycle reactivation in the axillary bud primordium of pineapple nodal segments. Transcript levels of cell cycle-associated genes, CycD2;1, and histone H2A were analyzed. Nodal segments containing the quiescent axillary meristem cells were cultivated in vitro during 24 h after the apex removal and de-rooting. From the moment of stem apex and root removal, decapitated nodal segment (DNS) explants showed a lower indol-3-acetic acid (IAA) concentration than control explants, and soon after, an increase of endogenous sucrose and iP-type Cks were detected. The decrease of IAA may be the primary signal for cell cycle control early in G1 phase, leading to the upregulation of CycD2;1 gene in the first h. Later, the iP-type Cks and sucrose could have triggered the progression to S-phase since there was an increase in H2A expression at the eighth h. DNS explants revealed substantial increase in Z-type Cks and glutamate from the 12th h, suggesting that these mitogens could also operate in promoting pineapple cell cycle progression. We emphasize that the use of non-synchronized tissue rather than synchronous cell suspension culture makes it more difficult to interpret the results of a dynamic cell division process. However, pineapple nodal segments cultivated in vitro may serve as an interesting model to shed light on apical dominance release and the reentrance of quiescent axillary meristem cells into the cell cycle.

Keywords

Apical dominance Cell cycle D-type cyclins Endogenous hormones H2A histone 

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Copyright information

© The Society for In Vitro Biology 2010

Authors and Affiliations

  • Beatriz M. Souza
    • 1
  • Jeanne B. Molfetta-Machado
    • 2
  • Luciano Freschi
    • 1
  • Antonio Figueira
    • 2
  • Eduardo Purgatto
    • 3
  • Marcos S. Buckeridge
    • 1
  • Marie-Anne Van Sluys
    • 1
  • Helenice Mercier
    • 1
  1. 1.Departamento de Botânica, Instituto de BiociênciasUniversidade de São PauloSão PauloBrazil
  2. 2.Laboratório de Melhoramento de Plantas, Centro de Energia Nuclear na AgriculturaUniversidade de São PauloPiracicabaBrazil
  3. 3.Departamento de Alimentos e Nutrição ExperimentalUniversidade de São PauloSão PauloBrazil

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