Systems analysis of shoot apical meristem growth and development: integrating hormonal and mechanical signaling.
Plant Cell
; 24(10): 3907-19, 2012 Oct.
Article
em En
| MEDLINE
| ID: mdl-23110895
ABSTRACT
The shoot apical meristem (SAM) is a small population of stem cells that continuously generates organs and tissues. This review covers our current understanding of organ initiation by the SAM in Arabidopsis thaliana. Meristem function and maintenance involves two major hormones, cytokinins and auxins. Cytokinins appear to play a major role in meristem maintenance and in controlling meristematic properties, such as cell proliferation. Self-organizing transport processes, which are still only partially understood, lead to the patterned accumulation of auxin at particular positions, where organs will grow out. A major downstream target of auxin-mediated growth regulation is the cell wall, which is a determinant for both growth rates and growth distribution, but feedbacks with metabolism and the synthetic capacity of the cytoplasm are crucial as well. Recent work has also pointed at a potential role of mechanical signals in growth coordination, but the precise mechanisms at work remain to be elucidated.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Reguladores de Crescimento de Plantas
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Transdução de Sinais
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Brotos de Planta
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Meristema
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Reino Unido