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Plant Physiology

Plant Physiology

IF: 6.5
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Jasmonates regulate apical hook development by repressing brassinosteroid biosynthesis and signaling

Published:22 September 2023 DOI: 10.1093/plphys/kiad399 PMID: 37467431
Jingjie Zhang, Weiyue Chen, Xiaopeng Li, Hongyong Shi, Minghui Lv, Liming He, Wenhua Bai, Shujing Cheng, Jinfang Chu, Kai He, Xiaoping Gou, Jia Li

Abstract

An apical hook is a special structure formed during skotomorphogenesis in dicotyledonous plant species. It is critical for protecting the shoot apical meristem from mechanical damage during seed germination and hypocotyl elongation in soil. Brassinosteroid (BR) and jasmonate (JA) phytohormones antagonistically regulate apical hook formation. However, the interrelationship between BRs and JAs in this process has not been well elucidated. Here, we reveal that JAs repress BRs to regulate apical hook development in Arabidopsis (Arabidopsis thaliana). Exogenous application of methyl jasmonate (MeJA) repressed the expression of the rate-limiting BR biosynthetic gene DWARF4 (DWF4) in a process relying on 3 key JA-dependent transcription factors, MYC2, MYC3, and MYC4. We demonstrated that MYC2 interacts with the critical BR-activated transcription factor BRASSINAZOLE RESISTANT 1 (BZR1), disrupting the association of BZR1 with its partner transcription factors, such as those of the PHYTOCHROME INTERACTING FACTOR (PIF) family and downregulating the expression of their target genes, such as WAVY ROOT GROWTH 2 (WAG2), encoding a protein kinase essential for apical hook development. Our results indicate that JAs not only repress the expression of BR biosynthetic gene DWF4 but, more importantly, attenuate BR signaling by inhibiting the transcriptional activation of BZR1 by MYC2 during apical hook development.

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Materials
Procduct Name CAS Molecular Formula Supplier Price
MG-132 133407-82-6 C26H41N3O5 426 suppliers $11.00-$3568.00
MG-132 133407-82-6 C26H41N3O5 426 suppliers $11.00-$3568.00
MG-132 133407-82-6 C26H41N3O5 426 suppliers $11.00-$3568.00
MG-132 133407-82-6 C26H41N3O5 426 suppliers $11.00-$3568.00

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