Selenium downregulates auxin and ethylene biosynthesis in rice seedlings to modify primary metabolism and root architecture
| Autor: | Fred A.L. Brito, Agustin Zsögön, Wagner L. Araújo, Thaline M. Pimenta, Lubia S. Teixeira, Lucas Cavalcante da Costa, Rodrigo T. Avila, Dimas M. Ribeiro, Rafael S. P. Malheiros |
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| Rok vydání: | 2019 |
| Předmět: |
Ethylene
Nicotiana tabacum Down-Regulation chemistry.chemical_element Plant Science Plant Roots Selenium chemistry.chemical_compound Plant Growth Regulators Biosynthesis Gene Expression Regulation Plant Auxin Arabidopsis Genetics chemistry.chemical_classification Oryza sativa Indoleacetic Acids biology Chemistry fungi Lateral root food and beverages Biological Transport Oryza Ethylenes biology.organism_classification Cell biology Seedlings |
| Zdroj: | Planta. 250:333-345 |
| ISSN: | 1432-2048 0032-0935 |
| DOI: | 10.1007/s00425-019-03175-6 |
| Popis: | Selenium modulates the formation of primary and lateral roots through alterations in auxin and ethylene, leading to new patterns of root architecture in rice seedlings. Selenium (Se) at low concentrations can control root growth through interaction with hormone biosynthesis. Auxin and ethylene have been shown to control the root architecture, with most of the information obtained from the eudicots such Arabidopsis and Nicotiana tabacum. Here, we presented the effects of Se on auxin and ethylene pathways and examined their impact on primary metabolism and root system architecture in rice (Oryza sativa L.) seedlings. Se treatment increased elongation of primary root, but decreased the number and length of lateral roots. Se led to decreased expression of genes associated with the biosynthesis of auxin and ethylene, concomitantly with reduced production of these hormones by the roots. Moreover, Se decreased the abundance of transcripts encoding auxin transport proteins. Indole-3-acetic acid (IAA) treatment overrode the repressive effect of Se on lateral root growth. The ethylene synthesis inhibitor L-α-(2-aminoethoxyvinyl)-glycine (AVG) increased elongation of primary root, whereas the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC) resulted in the opposite effect. Soluble sugars accumulate in roots of rice seedlings under Se treatment. Thus, Se modulates the formation of primary and lateral roots through alterations in auxin and ethylene, leading to new patterns of root architecture in rice seedlings. |
| Databáze: | OpenAIRE |
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