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Control of sucrose accumulation in sugarcane (Saccharum spp. hybrids) involves miRNA-mediated regulation of genes and transcription factors associated with sugar metabolism

文献类型： 外文期刊

作者： Wang, Miao 1 ; Li, Ao-Mei 2 ; Liao, Fen 2 ; Qin, Cui-Xian 2 ; Chen, Zhong-Liang 1 ; Zhou, Li 2 ; Li, Yang-Rui 2 ; Li, Xia 1 ;

作者机构： 1.Guangxi Univ, Guangxi Key Lab Sugarcane Biol, State Key Lab Conservat & Utilizat Subtrop Agrobi, Coll Agr, Nanning 530004, Peoples R China

2.Guangxi Acad Agr Sci, Guangxi Key Lab Sugarcane Genet Improvement, Sugarcane Res Inst, Minist Agr & Rural Affairs,Key Lab Sugarcane Biot, Nanning 530007, Peoples R China

3.Southwest Univ, Coll Resources & Environm, Interdisciplinary Res Ctr Agr Green Dev Yangtze R, Chongqing, Peoples R China

4.Univ Queensland, Queensland Alliance Agr & Food Innovat, St Lucia, Qld, Australia

关键词： gene; miRNA; sucrose accumulation; sugar metabolism; sugarcane; transcription factor

期刊名称：GLOBAL CHANGE BIOLOGY BIOENERGY （ 影响因子：4.745； 五年影响因子：5.672 ）

ISSN： 1757-1693

年卷期：

页码：

收录情况： SCI

摘要： Sugarcane is an established industrial crop providing sugar, ethanol and biomass-derived electricity worldwide. Cane sugar content is an important breeding target, but its improvement remains very slow in many breeding programmes. Biotechnology strategies to improve sucrose accumulation made little progress at the crop level, mainly due to the limited understanding of its regulation. miRNAs regulate many metabolic processes in plants. However, their roles and target genes associated with sugarcane sucrose accumulation remain unknown. Here, we conducted high-throughput sequencing of transcriptome, small RNAs and degradome of leaves and stem of two early-maturing sugarcane genotypes with contrasting sucrose content from the early to late stages of sucrose accumulation stages, which provided more insights into miRNA-associated gene regulation during sucrose accumulation. The stem sucrose content in both genotypes increased steadily with time during sucrose accumulation stage. Transcriptome analysis identified 18,722 differentially expressed genes (DEGs) between both genotypes during sucrose accumulation. The major DEGs identified were involved in starch and sucrose metabolism, and photosynthesis. miRNA sequencing identified 563 known and 281 novel miRNAs from both genotypes during sucrose accumulation. Of these, 311 miRNAs were differentially expressed. A combined transcriptome and miRNA data analysis revealed differentially expressed miRNA-target mRNA pairs related to sugar metabolism, of which 46 targets were transcription factors (TFs). miR172, miR164, miR396 and miR169 appear to regulate AP2/ERF, NAC, GRF and bZIP TF members associated with sugar metabolism. This is the first report of sugarcane miRNAs associated with sugar accumulation.

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