| Texto completo | |
| Autor(es): |
Rosado, Daniele
;
Ackermann, Amanda
;
Spassibojko, Olya
;
Rossi, Magdalena
;
Pedmale, Ullas, V
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Plant Physiology; v. 188, n. 2, p. 18-pg., 2022-02-04. |
| Resumo | |
Shade-intolerant plants rapidly elongate their stems, branches, and leaf stalks to compete with neighboring vegetation, maximizing sunlight capture for photosynthesis. This rapid growth adaptation, known as the shade-avoidance response (SAR), comes at a cost: reduced biomass, crop yield, and root growth. Significant progress has been made on the mechanistic understanding of hypocotyl elongation during SAR; however, the molecular interpretation of root growth repression is not well understood. Here, we explore the mechanisms by which SAR induced by low red:far-red light restricts primary and lateral root (LR) growth. By analyzing the whole-genome transcriptome, we identified a core set of shade-induced genes in roots of Arabidopsis (Arabidopsis thaliana) and tomato (Solanum lycopersicum) seedlings grown in the shade. Abiotic and biotic stressors also induce many of these shade-induced genes and are predominantly regulated by WRKY transcription factors. Correspondingly, a majority of WRKY genes were among the shade-induced genes. Functional analysis using transgenics of these shade-induced WRKYs revealed that their role is essentially to restrict primary root and LR growth in the shade; captivatingly, they did not affect hypocotyl elongation. Similarly, we also found that ethylene hormone signaling is necessary for limiting root growth in the shade. We propose that during SAR, shade-induced WRKY26, 45, and 75, and ethylene reprogram gene expression in the root to restrict its growth and development. Low red:far-red shade induces genes in roots regulated by WRKY transcription factors and ethylene, restricting primary and lateral root growth. (AU) | |
| Processo FAPESP: | 16/01128-9 - Controle luminoso e hormonal da qualidade nutricional em Solanum lycopersicum |
| Beneficiário: | Maria Magdalena Rossi |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |