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


Li, Y and Yang, X and Lui, HJ and Wang, W and Wang, C and Ding, G and Xu, F and Wang, S and Cai, H and Hammond, JP and White, PJ and Shabala, S and Yu, M and Shi, L, Local and systemic responses conferring acclimation of Brassica napusroots to low phosphorus conditions, Journal of experimental botany, 73, (14) pp. 4753-4777. ISSN 1460-2431 (2022) [Refereed Article]

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DOI: doi:10.1093/jxb/erac177


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 Details

Item Type:Refereed Article
Keywords:phosphorous; signalling; Brassica; root
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Crop and pasture production
Research Field:Crop and pasture biochemistry and physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural crops
Objective Field:Protected vegetable crops
UTAS Author:Shabala, S (Professor Sergey Shabala)
ID Code:155136
Year Published:2022
Web of Science® Times Cited:3
Deposited By:Agriculture and Food Systems
Deposited On:2023-01-30
Last Modified:2023-01-31

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