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Genes (Basel) ; 12(2)2021 02 07.
Artigo em Inglês | MEDLINE | ID: mdl-33562207

RESUMO

Mutations in the Arabidopsis TETRATRICOPEPTIDE THIOREDOXIN-LIKE 1 (TTL1) gene cause reduced tolerance to osmotic stress evidenced by an arrest in root growth and root swelling, which makes it an interesting model to explore how root growth is controlled under stress conditions. We found that osmotic stress reduced the growth rate of the primary root by inhibiting the cell elongation in the elongation zone followed by a reduction in the number of cortical cells in the proximal meristem. We then studied the stiffness of epidermal cell walls in the root elongation zone of ttl1 mutants under osmotic stress using atomic force microscopy. In plants grown in control conditions, the mean apparent elastic modulus was 448% higher for live Col-0 cell walls than for ttl1 (88.1 ± 2.8 vs. 16.08 ± 6.9 kPa). Seven days of osmotic stress caused an increase in the stiffness in the cell wall of the cells from the elongation zone of 87% and 84% for Col-0 and ttl1, respectively. These findings suggest that TTL1 may play a role controlling cell expansion orientation during root growth, necessary for osmotic stress adaptation.


Assuntos
Proteínas de Arabidopsis/genética , Arabidopsis/genética , Raízes de Plantas/genética , Estresse Fisiológico/genética , Aclimatação/genética , Adaptação Fisiológica/genética , Anisotropia , Arabidopsis/crescimento & desenvolvimento , Parede Celular/genética , Regulação da Expressão Gênica de Plantas/genética , Meristema/genética , Meristema/crescimento & desenvolvimento , Pressão Osmótica , Raízes de Plantas/crescimento & desenvolvimento , Plantas Geneticamente Modificadas/genética , Plantas Geneticamente Modificadas/crescimento & desenvolvimento
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