ArticleBMC genomics2025
Transcriptome analyses for revealing leaf abscission of Cyclocarya paliurus stem segments in vitro.
Article in BMC genomics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Leaf abscission of Cyclocarya paliurus stem segments in vitro is very serious, and more than 90% of the leaves gradually fall off with prolonged culture time, which hinders breeding. This study investigated the molecular mechanism of leaf abscission. The emerged leaves of C. paliurus stem segments were cultured for 22 days (T0) in vitro; leaves at 27 days (T1) and leaves that had fallen after ≥ 32 days (T2) were used as materials for analysis of the physiological characteristics and transcriptome data. During the leaf abscission process of C. paliurus, the Indole-3-acetic acid (IAA) content gradually decreased, whereas the carotenoid, 1-aminocyclopropane-1-carboxylic acid (ACC) and lignin contents and pectinase and cellulase activities significantly increased; 1807 and 10,908 DEGs were obtained in T0 vs T1 and T1 vs T2, respectively. The plant hormone signal transduction pathway, phenylpropanoid biosynthesis pathway and flavonoid biosynthesis pathway were significantly enriched in the KEGG metabolic pathway analysis. The differential expression of related genes affected AUX and Ethylene (ETH) biosynthesis and signal transduction, lignin synthesis, ROS metabolism, leaf color changes. Weighted gene coexpression network analysis (WGCNA) identified 10 hub genes (U-box protein, ERF5, ERF109, ERF4, SAUR36, CML19, MYC2-like,SPHK1, TOE3, POD55) that interact to activate abscission signaling, which subsequently influences the genes expression involved in the biosynthesis and signal transduction of auxin and ethylene; this resulted in an imbalance of endogenous hormone levels in the leaves, leading to the upregulation of pectinase, cellulase, and lignin biosynthesis genes and acceleration of the rupture of the abscission zone (AZ) cell and vascular cell wall, which ultimately led to leaf abscission. The present study illustrates a regulatory mechanism of leaf abscission of C. paliurus stem segments in vitro, which provides potential application value for guiding the inhibition of leaf abscission in vitro.
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