Hydraulic flux-responsive hormone redistribution determines root branching.
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| Title: | Hydraulic flux-responsive hormone redistribution determines root branching. |
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| Authors: | Mehra, Poonam, Pandey, Bipin K., Melebari, Dalia, Banda, Jason, Leftley, Nicola, Couvreur, Valentin, Rowe, James, Anfang, Moran, De Gernier, Hugues, Morris, Emily, Sturrock, Craig J., Mooney, Sacha J., Swarup, Ranjan, Faulkner, Christine, Beeckman, Tom, Bhalerao, Rishikesh P., Shani, Eilon, Jones, Alexander M., Dodd, Ian C., Sharp, Robert E. |
| Source: | Science (pre-March 2025). 11/18/2022, Vol. 378 Issue 6621, p762-768. 7p. 5 Color Photographs. |
| Subjects: | Distributed resources (Electric utilities), Branching (Botany), Plant hormones, Plant roots, Phenotypic plasticity in plants, Soil moisture |
| Abstract: | Plant roots exhibit plasticity in their branching patterns to forage efficiently for heterogeneously distributed resources, such as soil water. The xerobranching response represses lateral root formation when roots lose contact with water. Here, we show that xerobranching is regulated by radial movement of the phloem-derived hormone abscisic acid, which disrupts intercellular communication between inner and outer cell layers through plasmodesmata. Closure of these intercellular pores disrupts the inward movement of the hormone signal auxin, blocking lateral root branching. Once root tips regain contact with moisture, the abscisic acid response rapidly attenuates. Our study reveals how roots adapt their branching pattern to heterogeneous soil water conditions by linking changes in hydraulic flux with dynamic hormone redistribution. [ABSTRACT FROM AUTHOR] |
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| Database: | Psychology and Behavioral Sciences Collection |
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| Abstract: | Plant roots exhibit plasticity in their branching patterns to forage efficiently for heterogeneously distributed resources, such as soil water. The xerobranching response represses lateral root formation when roots lose contact with water. Here, we show that xerobranching is regulated by radial movement of the phloem-derived hormone abscisic acid, which disrupts intercellular communication between inner and outer cell layers through plasmodesmata. Closure of these intercellular pores disrupts the inward movement of the hormone signal auxin, blocking lateral root branching. Once root tips regain contact with moisture, the abscisic acid response rapidly attenuates. Our study reveals how roots adapt their branching pattern to heterogeneous soil water conditions by linking changes in hydraulic flux with dynamic hormone redistribution. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00368075 |
| DOI: | 10.1126/science.add3771 |
