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Regulation by sugar and hormone signaling of the growth of Brassica napus L. axillary buds at the transcriptome level

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Abstract

Branching is an important factor affecting the yield of Brassica napus L. Generally, however, field-grown B. napus cannot develop branches from the middle and lower parts of the plant, although axillary buds are present in these parts. To explore the cause of this phenomenon at the mRNA level, we analyzed buds from the top, upper, middle and lower parts of B. napus by RNA-SEq. In total, 27,992 expressed genes were found, 479 of which were considered to be closely related to axillary bud development. Genes related to the regulation of sugar signaling and plant hormone signal transduction were subjected to Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses. Seven types of transcription factors, including phytochrome-interacting factors (PIFs), homeobox 1 (HB-1), light sensitive hypocotyls 4 (LSH4), BRANCHED 1 (BRC1), WRKY DNA-binding proteins (WRKYs) and Transducin/WD40 repeat-like superfamily proteins (WD40s), were enriched. The soluble sugar content in the axillary buds was assessed and found to differ significantly among the four regions of the plant; in short, the soluble sugar content decreased from top to bottom. In this study, we provide a transcriptional profile of axillary buds from different parts of B. napus plants; these data will be important for future studies on the growth and development of axillary buds.

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Acknowledgements

The authors thank the Chongqing Engineering Research Center for Rapeseed for providing samples from their germplasm collection. We are also grateful to the anonymous reviewers for their valuable comments, which improved the quality of the paper. This work was supported by the National Natural Science Foundation of China (31771830, 31701335, and 31971902) and the “111” Project (B12006).

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  1. Chongqing Engineering Research Center for Rapeseed, College of Agronomy and Biotechnology, Academy of Agricultural Sciences Southwest University, State Cultivation Base of Crop Stress Biology for Southern Mountainous Land of Southwest University, Tiansheng Rd 2#, Beibei, 400715, Chongqing, China

    Zhihui Li, Yiran Ding, Ling Xie, Hongju Jian, Yumin Gao, Jiaming Yin, Jiana Li & Liezhao Liu

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Li, Z., Ding, Y., Xie, L. et al. Regulation by sugar and hormone signaling of the growth of Brassica napus L. axillary buds at the transcriptome level. Plant Growth Regul 90, 571–584 (2020). https://doi.org/10.1007/s10725-020-00581-9

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