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- W2783605644 abstract "Plants in dense vegetation compete for resources and detect competitors through reflection of far-red (FR) light from surrounding plants. This reflection causes a reduced red (R):FR ratio, which is sensed through phytochromes. Low R:FR induces shade avoidance responses of the shoot and also changes the root system architecture, although this has received little attention so far. Here, we investigate the molecular mechanisms through which light detection in the shoot regulates root development in Arabidopsis thaliana. We do so using a combination of microscopy, gene expression, and mutant study approaches in a setup that allows root imaging without exposing the roots to light treatment. We show that low R:FR perception in the shoot decreases the lateral root (LR) density by inhibiting LR emergence. This decrease in LR emergence upon shoot FR enrichment is regulated by phytochrome-dependent accumulation of the transcription factor ELONGATED HYPOCOTYL5 (HY5) in the LR primordia. HY5 regulates LR emergence by decreasing the plasma membrane abundance of PIN-FORMED3 and LIKE-AUX1 3 auxin transporters. Accordingly, FR enrichment reduces the auxin signal in the overlaying cortex cells, and this reduces LR outgrowth. This shoot-to-root communication can help plants coordinate resource partitioning under competition for light in high density fields." @default.
- W2783605644 created "2018-01-26" @default.
- W2783605644 creator A5000573694 @default.
- W2783605644 creator A5005230317 @default.
- W2783605644 creator A5040080059 @default.
- W2783605644 creator A5044316304 @default.
- W2783605644 creator A5045717142 @default.
- W2783605644 creator A5062142729 @default.
- W2783605644 date "2018-01-01" @default.
- W2783605644 modified "2023-10-18" @default.
- W2783605644 title "Far-Red Light Detection in the Shoot Regulates Lateral Root Development through the HY5 Transcription Factor" @default.
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