Characterization of full-length transcriptome in Saccharum officinarum and molecular insights into tiller development

BMC Plant Biology

Hanmin Luo¹  Ting Luo¹  Lihang Qiu¹  Huiwen Zhou¹  Zhongfeng Zhou¹  Rongfa Chen¹  Yangrui Li¹  Yegeng Fan¹  Haifeng Yan¹  Jianming Wu¹  Xujuan Li²  Xinlong Liu² 

[1] Sugarcane Research Institute of Guangxi Academy of Agricultural Sciences, Guangxi Key Laboratory of Sugarcane Genetic Improvement, and Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture, East Daxue Road 172, 530004, Nanning, Guangxi, China;Sugarcane Research Institute of Yunnan Academy of Agricultural Sciences, East Lingquan Road 172, 661600, Kaiyun, Yunnan, China;

关键词: Crop productivity;    Genomic data;    C plant;    Carbon fixation;    Linoleic acid;    Gene expression;   

DOI  :  10.1186/s12870-021-02989-5

来源: Springer

【 摘 要 】

BackgroundAlthough extensive breeding efforts are ongoing in sugarcane (Saccharum officinarum L.), the average yield is far below the theoretical potential. Tillering is an important component of sugarcane yield, however, the molecular mechanism underlying tiller development is still elusive. The limited genomic data in sugarcane, particularly due to its complex and large genome, has hindered in-depth molecular studies.ResultsHerein, we generated full-length (FL) transcriptome from developing leaf and tiller bud samples based on PacBio Iso-Seq. In addition, we performed RNA-seq from tiller bud samples at three developmental stages (T0, T1 and T2) to uncover key genes and biological pathways involved in sugarcane tiller development. In total, 30,360 and 20,088 high-quality non-redundant isoforms were identified in leaf and tiller bud samples, respectively, representing 41,109 unique isoforms in sugarcane. Likewise, we identified 1063 and 1037 alternative splicing events identified in leaf and tiller bud samples, respectively. We predicted the presence of coding sequence for 40,343 isoforms, 98% of which was successfully annotated. Comparison with previous FL transcriptomes in sugarcane revealed 2963 unreported isoforms. In addition, we characterized 14,946 SSRs from 11,700 transcripts and 310 lncRNAs. By integrating RNA-seq with the FL transcriptome, 468 and 57 differentially expressed genes (DEG) were identified in T1vsT0 and T2vsT0, respectively. Strong up-regulation of several pyruvate phosphate dikinase and phosphoenolpyruvate carboxylase genes suggests enhanced carbon fixation and protein synthesis to facilitate tiller growth. Similarly, up-regulation of linoleate 9S-lipoxygenase and lipoxygenase genes in the linoleic acid metabolism pathway suggests high synthesis of key oxylipins involved in tiller growth and development.ConclusionsCollectively, we have enriched the genomic data available in sugarcane and provided candidate genes for manipulating tiller formation and development, towards productivity enhancement in sugarcane.

【 授权许可】

CC BY