The polycotyledon Mutant of Tomato Shows Enhanced Polar Auxin Transport1
AUTOR(ES)
Al-Hammadi, Arif S.A.
FONTE
The American Society for Plant Biologists
RESUMO
The polycotyledon mutant of tomato (Lycopersicon esculentum L. cv Ailsa Craig) showed altered development during embryogenesis and during vegetative and reproductive phases. The phenotype was pleiotropic and included the formation of extra cotyledons, changes in leaf shape, increased number of flowers (indeterminacy) with abnormal floral organs, the formation of epiphyllous structures, and altered gravitropism. The earliest defects were observed at the transition from the globular to the heart stage of embryogenesis with the formation of multiple cotyledons. Epidermal cells in the mutant embryo were smaller and less expanded compared with wild type. Examination of polar auxin transport (PAT) showed a striking enhancement in the case of the mutant. Increase in PAT did not appear to be caused by a decrease in flavonoids because the mutant had normal flavonoid levels. Application of 2,3,5-triiodobenzoic acid, an inhibitor of polar transport of auxin, rescued postgermination phenotypes of young seedlings. Our analysis reveals a level of control that negatively regulates PAT in tomato and its contribution to plant development and organogenesis.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=196586Documentos Relacionados
- Extracellular ATP Inhibits Root Gravitropism at Concentrations That Inhibit Polar Auxin Transport1
- Kinetics of Polar Auxin Transport 1
- Mathematical Model of Polar Auxin Transport 1
- Alteration of Auxin Polar Transport in the Arabidopsis ifl1 Mutants1
- Insensitivity of the Diageotropica Tomato Mutant to Auxin 1
