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Local and systemic responses conferring acclimation of Brassica napus roots to low phosphorus conditions

Li, Y., Yang, X., Liu, H., Wang, W., Wang, C., Ding, G., Xu, F., Wang, S., Cai, H., Hammond, J. P. ORCID: https://orcid.org/0000-0002-6241-3551, White, P. J., Shabala, S., Yu, M., Shi, L. ORCID: https://orcid.org/0000-0002-5312-8521 and Kopriva, S. (2022) Local and systemic responses conferring acclimation of Brassica napus roots to low phosphorus conditions. Journal of Experimental Botany. ISSN 0022-0957 (In Press)

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To link to this item DOI: 10.1093/jxb/erac177

Abstract/Summary

Due to the non-uniform distribution of inorganic phosphate (Pi) in the soil, plants modify their root architecture to improve acquisition of this nutrient. In this study, a split-root system was employed to assess the nature of local and systemic signals that modulate root architecture of Brassica napus grown with non-uniform Pi availability. Lateral root (LR) growth was regulated systemically by non-uniform Pi distribution, by increasing the second-order LR (2°LR) density in compartments with high Pi supply but decreasing it in compartments with low Pi availability. Transcriptomic profiling identified groups of genes regulated, both locally and systemically, by Pi starvation. The number of systemically induced genes was greater than the number of genes locally induced, and included genes related to abscisic acid (ABA) and jasmonic acid (JA) signalling pathways, reactive oxygen species (ROS) metabolism, sucrose, and starch metabolism. Physiological studies confirmed the involvement of ABA, JA, sugars, and ROS in the systemic Pi starvation response. Our results reveal the mechanistic basis of local and systemic responses of B. napus to Pi starvation and provide new insights into the molecular and physiological basis of root plasticity.

Item Type:Article
Refereed:Yes
Divisions:Interdisciplinary centres and themes > Soil Research Centre
Life Sciences > School of Agriculture, Policy and Development > Department of Crop Science
ID Code:105675
Publisher:Oxford University Press

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