What is the role of PagHSF4 in the growth and development of poplar trees?

Label:chem

Topic
PagHSF4 is a class B heat shock factor (HSF) gene in poplar trees. HSFs are crucial regulators in plants, involved in modulating plant developmental processes and facilitating adaptation to environmental challenges. PagHSF4 encodes a nuclear-localized protein with a repressor motif "LFGV" and lacks transcriptional activation ability.

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
Overexpression of PagHSF4 in poplar results in notable phenotypic changes, such as reduced growth, modified stem and leaf characteristics, and diminished salt tolerance. Conversely, plants with suppressed PagHSF4 expression exhibit minor phenotypic variations, except for increased stomatal aperture, implying functional overlap. PagHSF4 modulates the expression of key downstream target genes and regulates plant hormone signaling pathways, particularly enhancing jasmonic acid (JA) production.
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