Interplay between ABA and GA Modulates the Timing of Asymmetric Cell Divisions in the Arabidopsis Root Ground Tissue.
Mol Plant
; 9(6): 870-84, 2016 06 06.
Article
em En
| MEDLINE
| ID: mdl-26970019
ABSTRACT
In multicellular organisms, controlling the timing and extent of asymmetric cell divisions (ACDs) is crucial for correct patterning. During post-embryonic root development in Arabidopsis thaliana, ground tissue (GT) maturation involves an additional ACD of the endodermis, which generates two different tissues the endodermis (inner) and the middle cortex (outer). It has been reported that the abscisic acid (ABA) and gibberellin (GA) pathways are involved in middle cortex (MC) formation. However, the molecular mechanisms underlying the interaction between ABA and GA during GT maturation remain largely unknown. Through transcriptome analyses, we identified a previously uncharacterized C2H2-type zinc finger gene, whose expression is regulated by GA and ABA, thus named GAZ (GA- AND ABA-RESPONSIVE ZINC FINGER). Seedlings ectopically overexpressing GAZ (GAZ-OX) were sensitive to ABA and GA during MC formation, whereas GAZ-SRDX and RNAi seedlings displayed opposite phenotypes. In addition, our results indicated that GAZ was involved in the transcriptional regulation of ABA and GA homeostasis. In agreement with previous studies that ABA and GA coordinate to control the timing of MC formation, we also confirmed the unique interplay between ABA and GA and identified factors and regulatory networks bridging the two hormone pathways during GT maturation of the Arabidopsis root.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Arabidopsis
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Ácido Abscísico
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Raízes de Plantas
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Divisão Celular Assimétrica
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Giberelinas
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Mol Plant
Assunto da revista:
BIOLOGIA MOLECULAR
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BOTANICA
Ano de publicação:
2016
Tipo de documento:
Article