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Adventitious root helps expanding root system and enhancing resistance, and its induction is widely used in asexual propagation of crops. Comparisons of the differentially expressed genes associated with adventitious root formation in different species, and analyze the conserved genes among them, so as to provide candidate genes for the comprehensive understanding of the regulatory mechanism of adventitious root formation.
Based on the transcriptomes of adventitious root formation of Petunia hybrida, Dianthus caryophyllus, Cucumis sativus, Populus euramericana, and Fagopyrum esculentum that downloaded from the public database, we obtained transcript abundance via HISAT2 and Cufflinks pipeline, and counted and screened the differentially expressed genes by DESeq2. The homologs most similar to Arabidopsis and differentially expressed genes in each species were obtained by homologous alignment. The genes in the intersection set were obtained by set analysis, and their functional annotation and enrichment analysis were carried out in AmiGO. And qPCR was used to examine the expression patterns related to adventitious root development in crops other than these five species.
A total number of 15 conserved up-regulated genes were obtained from five species, which were mainly participate in stress response, cell division, peroxidase and mevalonate synthesis pathways. The conserved down-regulated genes and pathways mainly participate in the regulation of ion and chemical homeostasis. With the development of adventitious roots, two types (ⅠandⅡ) of expression patterns of up-regulated genes were seen. NRT3.1 and WRKY75 peaked at the early induction stage of 24 hours (typeⅠ), at the period of the adventitious root primordium formation. While the expression levels of CYCB2;4 and KNOLLE increased gradually in the later induction stage of 48-96 hours and extending to the elongation stage (typeⅡ), at the period of the adventitious root protruding beyond the periderm. Consistent patterns of the expression levels of conserved genes during the induction of adventitious roots were identified in tomatoes and watermelons, which belong to dicotyledon. While in monocotyledon like maizes, genes with higher similarity, such as WRKY75, CYCB2;4, and KNOLLE, performed similar patteren, except for NRT3.1.
Regardless of various species, tissues, and treatments, the adventitious root formation relies on the conserved pathways and genes involved in stress response and cell division. The conserved up-regulated genes NRT3.1, WRKY75, CYCB2;4, KNOLLE can be used as candidate genes for adventitious root formation for in-depth analysis in many dicotyledonous species.
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