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Journal of Integrative Agriculture  2024, Vol. 23 Issue (4): 1105-1117    DOI: 10.1016/j.jia.2023.06.027
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Transcriptomic and metabolomic analysis provides insights into lignin biosynthesis and accumulation and differences in lodging resistance in hybrid wheat

Weibing Yang1, 2*, Shengquan Zhang1, 2*, Qiling Hou1*, Jiangang Gao1, Hanxia Wang1, Xianchao Chen1, Xiangzheng Liao1, Fengting Zhang1, 2, Changping Zhao1, 2#, Zhilie Qin1# 

1Institute of Hybrid Wheat, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China

2 Beijing Municipal Key Laboratory of Molecular Genetics of Hybrid Wheat, Beijing 100097, China

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摘要  

杂交小麦应用是未来提高小麦产量的一种途径,当前部分杂交小麦品种株高的增加在一定程度上加大了其倒伏风险。本研究以个抗倒伏性不同的杂交组合为试验材料,通过分析不同灌浆时期茎秆相关性状变化基部第二节间转录组和代谢组数据及基部第二节间木质素合成积累揭示其抗倒伏差异的形成机制。结果表明,抗倒伏杂交组合茎秆相关性状,如茎秆抗折力、穿刺强度、茎秆充实度及木质素含量(含GS型单体)均显著高于倒伏敏感性组合。KEGG富集分析表明,灌浆后期差异代谢物和差异表达基因主要被显著富集到苯丙烷生物合成途径。本试验共鉴定了35个参与苯丙烷途径的关键调控基因,其中42%的基因在灌浆后期显著差异表达,在显著差异表达基因中,超过80%的基因在抗倒伏组合中的表达显著高于其在倒伏敏感组合中的表达,而抗倒伏组合木质素合成途径中松柏醛、阿魏酸和松柏醇等中间代谢物显著低于倒伏敏感组合。综合分析表明,抗倒伏组合灌浆后期具有较高抗倒伏能力的关键在于具有较高的木质素合成能力。本验还通过已审定杂交小麦和常规小麦品种茎秆特征比较,提出了培育抗倒伏杂交小麦组合应关注的茎秆性状。



Abstract  

The use of hybrid wheat is one way to improve the yield in the future.  However, greater plant heights increase lodging risk to some extent.  In this study, two hybrid combinations with differences in lodging resistance were used to analyze the stem-related traits during the filling stage, and to investigate the mechanism of the difference in lodging resistance by analyzing lignin synthesis of the basal second internode (BSI).  The stem-related traits such as the breaking strength, stem pole substantial degree (SPSD), and rind penetration strength (RPS), as well as the lignin content of the lodging-resistant combination (LRC), were significantly higher than those of the lodging-sensitive combination (LSC).  The phenylpropanoid biosynthesis pathway was significantly and simultaneously enriched according to the transcriptomics and metabolomics analysis at the later filling stage.  A total of 35 critical regulatory genes involved in the phenylpropanoid pathway were identified.  Moreover, 42% of the identified genes were significantly and differentially expressed at the later grain-filling stage between the two combinations, among which more than 80% were strongly up-regulated at that stage in the LRC compared with LSC.  On the contrary, the LRC displayed lower contents of lignin intermediate metabolites than the LSC.  These results suggested that the key to the lodging resistance formation of LRC is largely the higher lignin synthesis at the later grain-filling stage.  Finally, breeding strategies for synergistically improving plant height and lodging resistance of hybrid wheat were put forward by comparing the LRC with the conventional wheat applied in large areas.

Keywords:  gene expression        lignin synthesis        lodging-resistance        hybrid wheat
  
Online: 15 February 2023   Accepted: 01 June 2023
Fund: This work was supported by the Youth Fund Project from Beijing Academy of Agricultural and Forestry Sciences, China (QNJJ202225), the Germplasm Innovation and New Variety Breeding Project of Beijing, China (G20220628002) and the Training Programme Foundation for the Beijing Municipal Excellent Talents, China (2017000020060G130).
About author:  #Correspondence Zhilie Qin, E-mail: qzl04@aliyun.com; Changping Zhao, E-mail: cp_zhao@vip.sohu.com * These authors contributed equally to this study.

Cite this article: 

YANG Wei-bing, ZHANG Sheng-quan, HOU Qi-ling, GAO Jian-gang, WANG Han-Xia, CHEN Xian-Chao, LIAO Xiang-zheng, ZHANG Feng-ting, ZHAO Chang-ping, QIN Zhi-lie. 2024.

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