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        Transcriptome profiling of indole-3-butyric acid-induced adventitious root formation in softwood cuttings of the Catalpa bungei variety ‘YU-1’ at different developmental stages

        Peng Wang,Ya Li,Lingling Ma,Shu’an Wang,Linfang Li,Rutong Yang,Yuzhu Ma,Qing Wang 한국유전학회 2016 Genes & Genomics Vol.38 No.2

        Catalpa bungei is a deciduous tree native to China. It is characterized as fast growing, being highly adaptable, and having excellent wood qualities. To better understand potential mechanisms involved in adventitious root (AR) formation, we performed transcriptome analysis of softwood cuttings of C. bungei ‘Yu-1’ at three stages of AR formation using the Illumina sequencing method. Following de novo assembly, 62,955 unigenes were obtained, 31,646 (50.26 %) of which were annotated. A total of 11,100 differentially expressed genes (DEGs), including 10,200 unique and 900 common, were identified in four comparisons. Based on the all GO enrichment networks, 46 common and 7 unique GO categories were identified. Cytoskeleton was only significantly enriched in the activation period, while DNA metabolic process was only significantly enriched in the callus formation. Functional annotation analysis revealed that many of these genes were involved in phenylpropanoid biosynthesis, glycolysis, and plant hormone metabolism, suggesting potential contributions to AR formation. Interestingly, the number of DEGs involved in glycolysis decreased while the number of DEGs involved in phenylpropanoid biosynthesis increased following the AR formative process. Overall, our comprehensive transcriptional overview will prove useful, not only in the understanding of molecular networks that regulate AR formation in C. bungei, but also for exploring genes that may improve rooting rates of other trees.

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        Comprehensive transcriptome analysis discovers novel candidate genes related to leaf color in a Lagerstroemia indica yellow leaf mutant

        Ya Li,Zhenyu Zhang,Peng Wang,Shu’an Wang,Lingling Ma,Linfang Li,Rutong Yang,Yuzhu Ma,Qing Wang 한국유전학회 2015 Genes & Genomics Vol.37 No.10

        Lagerstroemia indica is a popular woody ornamental plant throughout the world. However, relatively little is known about the molecular processes regulating leaf color in L. indica compared with other ornamental plants. Although yellow leaf mutants from various organisms have been well characterized, L. indica yellow leaf mutant has not yet been reported. In this study, a L. indica yellow leaf mutant, named YL03, was characterized and its leaf transcriptome was sequenced. A total of 30,712,752 reads were generated and assembled de novo into 45,308 unigenes with an average length of 987.51 bp. Among these unigenes, 21,339 (47.10 %) were identified as putative homologs of annotated sequences in public databases. A total of 79 unigenes involved in chlorophyll biosynthesis and degradation, photosynthesis and chloroplast development were identified. The expression levels of those genes were detected using quantitative real-time PCR in this study. Among those genes, 11 unigenes showed highly significant difference in the mutant compared to wild type plants. Conclusively, the leaf color formation is greatly affected by the activity of chloroplast development and chlorophyll metabolism. And the possible formation pathway of yellow leaf mutant is deduced based on our results.

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