PIFs coordinate shade avoidance by inhibiting auxin repressor ARF18 and metabolic regulator QQS (vol 228, pg 609, 2020)
| Autoři | |
|---|---|
| Rok publikování | 2020 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | NEW PHYTOLOGIST |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.16732 |
| Doi | https://doi.org/10.1111/nph.18884 |
| Klíčová slova | ARF18; auxin; phytochrome interacting factors (PIFs); qua-quine starch (QQS); shade avoidance |
| Přiložené soubory | |
| Popis | Shade avoidance syndrome (SAS) arises in densely growing plants that compete for light. InArabidopsis thaliana, phytochrome interacting factor (PIF) proteins link the perception of shade to stem elongation via auxin production. Here, we report that PIFs inhibit the shade-induced expression of AUXIN RESPONSE FACTOR 18 (ARF18), and ARF18 represses auxin signaling. Therefore, PIF-mediated inhibition ofARF18enhances auxin-dependent hypocotyl elongation in simulated shade. Furthermore, we show that both PIFs and ARF18 directly repress qua-quine starch (QQS), which controls the allocation of carbon and nitrogen. Shade-repressedQQSattenuates the conversion of starch to protein and thus reduced leaf area. Our results suggest that PIF-dependent gene regulation coordinates multiple SAS responses, including altered stem growth via ARF18, as well as altered leaf growth and metabolism via QQS. |
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