PagSAMDC4a-Mediated Polyamine Synthesis Regulate Vessel Differentiation Under Drought Stress Conditions in Poplar.

ABSTRACT: Frequent and prolonged drought stress is a primary factor limiting the growth and development of perennial woody plants. Xylem vessel cells are crucial for water transport in woody plants; however, the molecular mechanisms governing the changes in their morphogenesis in response to water deprivation remain unclear. Here, we report that the alterations in polyamine (PA) levels under drought stress, mediated by the key enzyme PagSAMDC4a in PA synthesis, influence vessel morphogenesis through the modulation of hydrogen peroxide (H₂O₂) concentration in poplar 84 K (Populus alba × Populus glandulosa). PagSAMDC4a expression was predominantly observed in the phloem and cambium zones of stems and was upregulated under drought conditions. Overexpression of PagSAMDC4a (PagSAMDC

SUBMITTER: Yao J 

PROVIDER: S-EPMC12576432 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature