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Position: Home > Articles > Comparative transcriptome profiling reveals that light coordinates auxin to inhibit adventitious root formation in grapevine Horticultural Plant Journal 2024

Comparative transcriptome profiling reveals that light coordinates auxin to inhibit adventitious root formation in grapevine

作者：

Yunzhang Yuan;Bai Miao;Pei-Yi Ni;Yanxia Li;Xiaohong Chang;Jiaqing He;Yang Gao;Shuangjiang L

关键词：

formation;ar;light;ars;petiole;gene

摘要：

Grapevine (Vitis sp.) is one of the most important economic fruit crops all over the world, and the formation of adventitious roots (ARs) is crucial for the vegetative reproduction of grapes. However, studies on the regulatory mechanisms of this process are currently lacking. In this study, we applied an efficient and convenient leave-petiole (LP) system for studying ARs, revealing a significant inhibition of root primordia formation under continuous-light treatment. The results showed that isolated ARs of grapevine were induced and originated from ray cells near the vascular cambium, with the process categorized into induction, initiation, and extension stages. LP samples under light and dark conditions were used for transcriptome sequencing and endogenous hormone measurements at three critical time points of AR formation. A total of 37 155 transcripts were obtained, and 7 041 genes showed significantly different expression levels in the petiole. An integrated analysis, including Gene Ontology (GO) enrichment analysis, weighted gene co-expression network analysis (WGCNA), and hormonal content determination, showed that several genes (ARF4, LAX1, PIN1, SUS2, APX1, TPXL1, CHS3, etc.) associated with hormone signals, sugar synthesis and transport, reactive oxygen species (ROS) scavenging, cell wall biogenesis, flavonoid biosynthesis, microtubule remodeling, and some transcription factors (HY5, COP1, ERF2, MYB15, etc) played vital roles in light-induced AR formation. A hypothetical model was initially constructed, which illustrated the centrality of auxin in HY5-dependent AR formation and the complex crosstalk among various factors. The results of this study provided abundant genetic resources and a novel perspective for understanding the molecular mechanisms of AR formation in grapevine.

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Comparative transcriptome profiling reveals that light coordinates auxin to inhibit adventitious root formation in grapevine

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