Gravity signal transduction in primary roots.
Ann Bot
; 96(5): 737-43, 2005 Oct.
Article
em En
| MEDLINE
| ID: mdl-16033778
ABSTRACT
AIMS:
The molecular mechanisms that correlate with gravity perception and signal transduction in the tip of angiosperm primary roots are discussed. SCOPE Gravity provides a cue for downward orientation of plant roots, allowing anchorage of the plant and uptake of the water and nutrients needed for growth and development. Root gravitropism involves a succession of physiologicalsteps:
gravity perception and signal transduction (mainly mediated by the columella cells of the root cap); signal transmission to the elongation zone; and curvature response. Interesting new insights into gravity perception and signal transduction within the root tip have accumulated recently by use of a wide range of experimental approaches in physiology, biochemistry, genetics, genomics, proteomics and cell biology. The data suggest a network of signal transduction pathways leading to a lateral redistribution of auxin across the root cap and a possible involvement of cytokinin in initial phases of gravicurvature.CONCLUSION:
These new discoveries illustrate the complexity of a highly redundant gravity-signalling process in roots, and help to elucidate the global mechanisms that govern auxin transport and morphogenetic regulation in roots.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Transdução de Sinais
/
Raízes de Plantas
/
Gravitropismo
Idioma:
En
Ano de publicação:
2005
Tipo de documento:
Article