SHORT-ROOT stabilizes PHOSPHATE1 to regulate phosphate allocation in Arabidopsis - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Nature Plants Année : 2022

SHORT-ROOT stabilizes PHOSPHATE1 to regulate phosphate allocation in Arabidopsis

Xinlong Xiao
Jieqiong Zhang
  • Fonction : Auteur
Viswanathan Satheesh
  • Fonction : Auteur
Fanxiao Meng
  • Fonction : Auteur
Wenlan Gao
  • Fonction : Auteur
Jinsong Dong
Zai Zheng
Guo-Yong An
  • Fonction : Auteur
Dong Liu
Mingguang Lei

Résumé

The coordinated distribution of inorganic phosphate (Pi) between roots and shoots is an important process that plants use to maintain Pi homeostasis. SHORT-ROOT (SHR) is well characterized for its function in root radial patterning. Here we demonstrate a role of SHR in controlling Pi allocation from root to shoot by regulating PHOSPHATE1 in the root differentiation zone. We recovered a weak mutant allele of SHR in Arabidopsis that accumulates much less Pi in the shoot and shows a constitutive Pi starvation response under Pi-sufficient conditions. In addition, Pi starvation suppresses SHR protein accumulation and releases its inhibition on the HD-ZIP III transcription factor PHB. PHB accumulates and directly binds the promoter of PHOSPHATE2 to upregulate its transcription, resulting in PHOSPHATE1 degradation in the xylem-pole pericycle cells. Our findings reveal a previously unrecognized mechanism of how plants regulate Pi translocation from roots to shoots. Plants confronted with nutrient deficiency allocate more resources to roots to maximize nutrient acquisition and growth. This study uncovers how plants repress phosphate uploading to curtail the long-distance transportation of phosphate to shoots.

Dates et versions

hal-03518724 , version 1 (08-02-2023)

Identifiants

Citer

Xinlong Xiao, Jieqiong Zhang, Viswanathan Satheesh, Fanxiao Meng, Wenlan Gao, et al.. SHORT-ROOT stabilizes PHOSPHATE1 to regulate phosphate allocation in Arabidopsis. Nature Plants, 2022, 15 (9), pp.1 - 2. ⟨10.1038/s41477-022-01231-w⟩. ⟨hal-03518724⟩
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