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Integrated Analysis of the Transcriptome and Metabolome Revealed Candidate Genes Involved in GA(3)-Induced Dormancy Release in Leymus chinensis Seeds

文献类型： 外文期刊

作者： Li, Bing 1 ; Zhang, Pan 1 ; Wang, Fengdan 1 ; Li, Ran 1 ; Liu, Jian 2 ; Wang, Qiannan 1 ; Liu, Wei 1 ; Wang, Bo 1 ; Hu, Guof 1 ;

作者机构： 1.Northeast Agr Univ, Coll Anim Sci & Technol, Harbin 150030, Peoples R China

2.Jilin Acad Agr Sci, Inst Grassland & Ecol, Changchun 130033, Peoples R China

关键词： Leymus chinensis; seed dormancy; transcriptome; metabolome; GA(3); dormancy release

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：4.556； 五年影响因子：4.653 ）

ISSN：

年卷期： 2021 年 22 卷 8 期

页码：

收录情况： SCI

摘要： Leymus chinensis is a perennial forage grass that has good palatability, high yield and high feed value, but seed dormancy is a major problem limiting the widespread cultivation of L. chinensis. Here, we performed transcriptomic and metabolomic analysis of hulled and de-hulled seeds of L. chinensis treated with or without GA(3) to investigate the changes in gene and metabolites associated with dormancy release induced by GA(3). The germination test revealed that the optimum concentration of GA(3) for disruption of L. chinensis seed dormancy was 577 mu M. A total of 4327 and 11,919 differentially expressed genes (DEGs) and 871 and 650 differentially abundant metabolites were identified in de-hulled and hulled seeds treated with GA(3), respectively, compared with seeds soaked in sterile water. Most of the DEGs were associated with starch and sucrose metabolism, protein processing in the endoplasmic reticulum, endocytosis and ribosomes. Furthermore, isoquinoline alkaloid biosynthesis, tyrosine metabolism, starch and sucrose metabolism, arginine and proline metabolism, and amino sugar and nucleotide sugar metabolism were significantly enriched pathways. Integrative analysis of the transcriptomic and metabolomic data revealed that starch and sucrose metabolism is one of the most important pathways that may play a key role in providing carbon skeletons and energy supply for the transition of L. chinensis seeds from a dormant state to germination by suppressing the expression of Cel61a, egID, cel1, tpsA, SPAC2E11.16c and TPP2, enhancing the expression of AMY1.1, AMY1.2, AMY1.6 and GLIP5, and inhibiting the synthesis of cellobiose, cellodextrin, and trehalose while promoting the hydrolysis of sucrose, starch, cellobiose, cellodextrin, and trehalose to glucose. This study identified several key genes and provided new insights into the molecular mechanism of seed dormancy release induced by GA(3) in L. chinensis. These putative genes will be valuable resources for improving the seed germination rate in future breeding studies.

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