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Open AccessArticle

CLE-CLAVATA1 Signaling Pathway Modulates Lateral Root Development under Sulfur Deficiency

Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824, USA
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Plants 2019, 8(4), 103; https://doi.org/10.3390/plants8040103
Received: 2 March 2019 / Revised: 8 April 2019 / Accepted: 17 April 2019 / Published: 18 April 2019
(This article belongs to the Special Issue Advances in Plant Sulfur Research)
Plant root system architecture changes drastically in response to availability of macronutrients in the soil environment. Despite the importance of root sulfur (S) uptake in plant growth and reproduction, molecular mechanisms underlying root development in response to S availability have not been fully characterized. We report here on the signaling module composed of the CLAVATA3 (CLV3)/EMBRYO SURROUNDING REGION (CLE) peptide and CLAVATA1 (CLV1) leucine-rich repeat receptor kinase, which regulate lateral root (LR) development in Arabidopsis thaliana upon changes in S availability. The wild-type seedlings exposed to prolonged S deficiency showed a phenotype with low LR density, which was restored upon sulfate supply. In contrast, the clv1 mutant showed a higher daily increase rate of LR density relative to the wild-type under prolonged S deficiency, which was diminished to the wild-type level upon sulfate supply, suggesting that CLV1 directs a signal to inhibit LR development under S-deficient conditions. CLE2 and CLE3 transcript levels decreased under S deficiency and through CLV1-mediated feedback regulations, suggesting the levels of CLE peptide signals are adjusted during the course of LR development. This study demonstrates a fine-tuned mechanism for LR development coordinately regulated by CLE-CLV1 signaling and in response to changes in S availability. View Full-Text
Keywords: Arabidopsis thaliana; CLE peptide; CLAVATA1; root system architecture; small signaling peptide; sulfate; sulfur Arabidopsis thaliana; CLE peptide; CLAVATA1; root system architecture; small signaling peptide; sulfate; sulfur
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Dong, W.; Wang, Y.; Takahashi, H. CLE-CLAVATA1 Signaling Pathway Modulates Lateral Root Development under Sulfur Deficiency. Plants 2019, 8, 103.

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