What is the role of jasmonic acid (JA) in the context of PagHSF4 overexpression in poplar?

Label:chem

Topic
Jasmonic acid (JA) is a plant hormone involved in various physiological processes, including growth regulation, defense responses, and stress tolerance. The study found that overexpression of PagHSF4 leads to elevated levels of JA in poplar tissues.

From: "PagHSF4 mediates the biosynthesis of jasmonic acid and plant hormone signal transduction to regulate the growth and development as well as salt stress tolerance of poplar", Industrial Crops and Products, Volume 234, 15 October 2025, 121582
Answer
The overexpression of PagHSF4 in poplar results in significant upregulation of genes involved in JA biosynthesis, leading to increased JA levels. This increase in JA is associated with reduced plant growth and biomass accumulation, likely due to the reallocation of carbon resources from primary growth to defense compound biosynthesis. Elevated JA levels also contribute to stomatal closure and enhanced salt stress sensitivity in poplar.
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